Java线程(五)：Timer和TimerTask
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<p style="color: #333333; font-family: Arial; line-height: 26px;"> Timer和TimerTask可以做为实现线程的第三种方式，前两中方式分别是继承自Thread类和实现Runnable接口。</p>
<p style="color: #333333; font-family: Arial; line-height: 26px;"> Timer是一种线程设施，用于安排以后在后台线程中执行的任务。可安排任务执行一次，或者定期重复执行，可以看成一个定时器，可以调度TimerTask。TimerTask是一个抽象类，实现了Runnable接口，所以具备了多线程的能力。</p>
<p style="color: #333333; font-family: Arial; line-height: 26px;"> 一个Timer可以调度任意多个TimerTask，它会将TimerTask存储在一个队列中，顺序调度，如果想两个TimerTask并发执行，则需要创建两个Timer。下面来看一个简单的例子： </p>
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<strong>[java]</strong> <a class="ViewSource" style="" title="view plain" href="http://blog.csdn.net/ghsau/article/details/7436458">view plain</a><a class="CopyToClipboard" style="" title="copy" href="http://blog.csdn.net/ghsau/article/details/7436458">copy</a>
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<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">import</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> java.util.Timer; </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">import</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> java.util.TimerTask; </span></span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">public</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">class</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> TimerTest { </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">static</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">class</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> MyTimerTask1 </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">extends</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> TimerTask { </span></span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">public</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">void</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> run() { </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> System.out.println(<span class="string" style="margin: 0px; padding: 0px; border: none; color: blue; background-color: inherit;">"爆炸！！！"</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">); </span></span></li>
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<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> } </span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">public</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">static</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">void</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> main(String[] args) { </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> Timer timer = <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">new</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> Timer(); </span></span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> timer.schedule(<span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">new</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> MyTimerTask1(), </span><span class="number" style="margin: 0px; padding: 0px; border: none; color: #c00000; background-color: inherit;">2000</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">);</span><span class="comment" style="margin: 0px; padding: 0px; border: none; color: #008200; background-color: inherit;">// 两秒后启动任务</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> } </span></li>
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<p><span style="color: #333333; font-family: Arial; line-height: 26px;"> schedule是Timer调度任务的方法，Timer重构了四个schedule方法，具体可以查看JDK API。</span></p>
<p style="color: #333333; font-family: Arial; line-height: 26px;"> </p>
<p style="color: #333333; font-family: Arial; line-height: 26px;"> 看一个稍复杂的例子，假设有这样一种需求，实现一个连环炸..，2秒后爆炸一次，3秒后爆炸一次，如此循环下去，这就需要创建两个任务，互相调度，代码如下：</p>
<p style="color: #333333; font-family: Arial; line-height: 26px;"> </p>
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<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">import</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> java.util.Date; </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">import</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> java.util.Timer; </span></span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">import</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> java.util.TimerTask; </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">public</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">class</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> TimerTest { </span></span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">static</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">class</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> MyTimerTask1 </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">extends</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> TimerTask { </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">public</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">void</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> run() { </span></span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> System.out.println(<span class="string" style="margin: 0px; padding: 0px; border: none; color: blue; background-color: inherit;">"爆炸！！！"</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">); </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">new</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> Timer().schedule(</span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">new</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> MyTimerTask2(), </span><span class="number" style="margin: 0px; padding: 0px; border: none; color: #c00000; background-color: inherit;">2000</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">); </span></span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> } </span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> } </span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">static</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">class</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> MyTimerTask2 </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">extends</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> TimerTask { </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">public</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">void</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> run() { </span></span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> System.out.println(<span class="string" style="margin: 0px; padding: 0px; border: none; color: blue; background-color: inherit;">"爆炸！！！"</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">); </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">new</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> Timer().schedule(</span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">new</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> MyTimerTask1(), </span><span class="number" style="margin: 0px; padding: 0px; border: none; color: #c00000; background-color: inherit;">3000</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">); </span></span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> } </span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> } </span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">public</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">static</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">void</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> main(String[] args) { </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> Timer timer = <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">new</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> Timer(); </span></span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> timer.schedule(<span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">new</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> MyTimerTask2(), </span><span class="number" style="margin: 0px; padding: 0px; border: none; color: #c00000; background-color: inherit;">2000</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">); </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">while</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">(</span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">true</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">) { </span></span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> System.out.println(<span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">new</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> Date().getSeconds()); </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">try</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> { </span></span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> Thread.sleep(<span class="number" style="margin: 0px; padding: 0px; border: none; color: #c00000; background-color: inherit;">1000</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">); </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> } <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">catch</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> (InterruptedException e) { </span></span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> <span class="comment" style="margin: 0px; padding: 0px; border: none; color: #008200; background-color: inherit;">// TODO Auto-generated catch block</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> e.printStackTrace(); </span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> } </span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> } </span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> } </span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;">} </span></li>
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<p style="color: #333333; font-family: Arial; line-height: 26px;"> 自JDK5之后，可以用ScheduledThreadPoolExecutor来替代Timer。</p>
<p style="color: #333333; font-family: Arial; line-height: 26px;"> 本文来自：<span style="color: #336699;">高爽</span><span style="color: #336699;">|Coder</span>，原文地址：<span style="color: #336699;">http://blog.csdn.net/ghsau/article/details/7436458</span>，转载请注明。</p>
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<p style="color: #333333; font-family: Arial; line-height: 26px;"> Timer和TimerTask可以做为实现线程的第三种方式，前两中方式分别是继承自Thread类和实现Runnable接口。</p>
<p style="color: #333333; font-family: Arial; line-height: 26px;"> Timer是一种线程设施，用于安排以后在后台线程中执行的任务。可安排任务执行一次，或者定期重复执行，可以看成一个定时器，可以调度TimerTask。TimerTask是一个抽象类，实现了Runnable接口，所以具备了多线程的能力。</p>
<p style="color: #333333; font-family: Arial; line-height: 26px;"> 一个Timer可以调度任意多个TimerTask，它会将TimerTask存储在一个队列中，顺序调度，如果想两个TimerTask并发执行，则需要创建两个Timer。下面来看一个简单的例子： </p>
<p style="color: #333333; font-family: Arial; line-height: 26px;"> </p>
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<strong>[java]</strong> <a class="ViewSource" style="" title="view plain" href="http://blog.csdn.net/ghsau/article/details/7436458">view plain</a><a class="CopyToClipboard" style="" title="copy" href="http://blog.csdn.net/ghsau/article/details/7436458">copy</a>
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<ol class="dp-j" style="border: none; background-color: #ffffff; color: #5c5c5c; margin-bottom: 1px !important; margin-left: 45px !important;" start="1">
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">import</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> java.util.Timer; </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">import</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> java.util.TimerTask; </span></span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">public</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">class</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> TimerTest { </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">static</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">class</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> MyTimerTask1 </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">extends</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> TimerTask { </span></span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">public</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">void</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> run() { </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> System.out.println(<span class="string" style="margin: 0px; padding: 0px; border: none; color: blue; background-color: inherit;">"爆炸！！！"</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">); </span></span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> } </span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> } </span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">public</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">static</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">void</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> main(String[] args) { </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> Timer timer = <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">new</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> Timer(); </span></span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> timer.schedule(<span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">new</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> MyTimerTask1(), </span><span class="number" style="margin: 0px; padding: 0px; border: none; color: #c00000; background-color: inherit;">2000</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">);</span><span class="comment" style="margin: 0px; padding: 0px; border: none; color: #008200; background-color: inherit;">// 两秒后启动任务</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> } </span></li>
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<p><span style="color: #333333; font-family: Arial; line-height: 26px;"> schedule是Timer调度任务的方法，Timer重构了四个schedule方法，具体可以查看JDK API。</span></p>
<p style="color: #333333; font-family: Arial; line-height: 26px;"> </p>
<p style="color: #333333; font-family: Arial; line-height: 26px;"> 看一个稍复杂的例子，假设有这样一种需求，实现一个连环炸..，2秒后爆炸一次，3秒后爆炸一次，如此循环下去，这就需要创建两个任务，互相调度，代码如下：</p>
<p style="color: #333333; font-family: Arial; line-height: 26px;"> </p>
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<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">import</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> java.util.Date; </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">import</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> java.util.Timer; </span></span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">import</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> java.util.TimerTask; </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">public</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">class</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> TimerTest { </span></span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">static</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">class</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> MyTimerTask1 </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">extends</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> TimerTask { </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">public</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">void</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> run() { </span></span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> System.out.println(<span class="string" style="margin: 0px; padding: 0px; border: none; color: blue; background-color: inherit;">"爆炸！！！"</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">); </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">new</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> Timer().schedule(</span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">new</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> MyTimerTask2(), </span><span class="number" style="margin: 0px; padding: 0px; border: none; color: #c00000; background-color: inherit;">2000</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">); </span></span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> } </span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> } </span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">static</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">class</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> MyTimerTask2 </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">extends</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> TimerTask { </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">public</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">void</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> run() { </span></span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> System.out.println(<span class="string" style="margin: 0px; padding: 0px; border: none; color: blue; background-color: inherit;">"爆炸！！！"</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">); </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">new</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> Timer().schedule(</span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">new</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> MyTimerTask1(), </span><span class="number" style="margin: 0px; padding: 0px; border: none; color: #c00000; background-color: inherit;">3000</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">); </span></span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> } </span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> } </span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">public</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">static</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">void</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> main(String[] args) { </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> Timer timer = <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">new</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> Timer(); </span></span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> timer.schedule(<span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">new</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> MyTimerTask2(), </span><span class="number" style="margin: 0px; padding: 0px; border: none; color: #c00000; background-color: inherit;">2000</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">); </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">while</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">(</span><span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">true</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">) { </span></span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> System.out.println(<span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">new</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> Date().getSeconds()); </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">try</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> { </span></span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> Thread.sleep(<span class="number" style="margin: 0px; padding: 0px; border: none; color: #c00000; background-color: inherit;">1000</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;">); </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> } <span class="keyword" style="margin: 0px; padding: 0px; border: none; color: #006699; background-color: inherit; font-weight: bold;">catch</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> (InterruptedException e) { </span></span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> <span class="comment" style="margin: 0px; padding: 0px; border: none; color: #008200; background-color: inherit;">// TODO Auto-generated catch block</span><span style="margin: 0px; padding: 0px; border: none; background-color: inherit;"> </span></span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> e.printStackTrace(); </span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> } </span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> } </span></li>
<li class="alt" style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; color: inherit; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;"> } </span></li>
<li style="border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding-left: 10px !important;"><span style="margin: 0px; padding: 0px; border: none; color: black; background-color: inherit;">} </span></li>
</ol>
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<p style="color: #333333; font-family: Arial; line-height: 26px;"> 自JDK5之后，可以用ScheduledThreadPoolExecutor来替代Timer。</p>
<p style="color: #333333; font-family: Arial; line-height: 26px;"> 本文来自：<span style="color: #336699;">高爽</span><span style="color: #336699;">|Coder</span>，原文地址：<span style="color: #336699;">http://blog.csdn.net/ghsau/article/details/7436458</span>，转载请注明。</p>
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