Java向：测试一个关于TimerTask的内容。

想要验证的东西

timertask里面只要while条件一直成立，那么这个timertask就会一直执行下去，timer也一直不会被清空。

 

代码1

package com.company;

import java.util.*;

public class Main2 {
    private Timer overallTimer;
    private void test() {
        Object lock = new Object();
        overallTimer = new Timer();
        List testIntegerList = new ArrayList<>();
        testIntegerList.add(1);
        testIntegerList.add(2);
        testIntegerList.add(3);
        overallTimer.schedule(new TimerTask() {
            @Override
            public void run() {
                synchronized (lock) {
                    Iterator it = testIntegerList.iterator();
                    while(it.hasNext()) {
                        Integer currentInteger = it.next();
                        System.out.println(currentInteger);
                    }
                }
            }
        }, 2000, 2000);
    }
    public static void main(String[] args) {
        Main2 main2 = new Main2();
        main2.test();
        System.out.println(main2.overallTimer == null);
    }
}

 

Console打印

false
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
...

 

代码2

package com.company;

import java.util.*;

public class Main2 {
    private Timer overallTimer;
    private void test() {
        Object lock = new Object();
        overallTimer = new Timer();
        List testIntegerList = new ArrayList<>();
        testIntegerList.add(1);
        testIntegerList.add(2);
        testIntegerList.add(3);
        testIntegerList.add(4);
        testIntegerList.add(5);
        overallTimer.schedule(new TimerTask() {
            @Override
            public void run() {
                synchronized (lock) {
                    Iterator it = testIntegerList.iterator();
                    while(it.hasNext()) {
                        Integer currentInteger = it.next();
                        System.out.println(currentInteger);
                        it.remove();
                    }
                }
            }
        }, 2000, 2000);
    }
    public static void main(String[] args) {
        Main2 main2 = new Main2();
        main2.test();
        System.out.println(main2.overallTimer == null);
    }
}

Console打印

false
1
2
3
4
5