ThreadLocal和InheritableThreadLocal的使用

ThreadLocal
可以在在线程内实现一个局部变量，可以在线程的任何地方来访问，能够减少参数的传递

package  jp.co.realseed;
public   class  ThreadLocalTest  ... {
    private static ThreadLocal tl_1 = new ThreadLocal()...{
        //返回本线程的名字，变量1
        protected Object initialValue() ...{
            return  "Thread name 1 : "+Thread.currentThread().getName();
        }
    };
    private static ThreadLocal tl_2 = new ThreadLocal()...{
        //返回本线程的名字，变量2
        protected Object initialValue() ...{
            return  "Thread name 2 : "+Thread.currentThread().getName();
        }
    };
    public static void main(String[] args) ...{
        for (int i = 0; i < 10; i++) ...{
            new Thread(new Runnable()...{
                public void run() ...{
                    new ThreadLocalTest().prt();
                }
            }).start();
        }
    }
    //打印本线程的名字
    public void prt()...{
        System.out.println(tl_1.get());
        System.out.println(tl_2.get());
    }
}

InheritableThreadLocal
可以在子线程和父线程之间共享实例，也同样是为了减少参数的传递

package  jp.co.realseed;
public   class  InheritableThreadLocalTest  ... {
    private static InheritableThreadLocal ITL = new InheritableThreadLocal()...{
        protected Object initialValue() ...{
            return new StringBuffer("hello");
        }
    };
    public static void main(String[] args) ...{
        System.out.println(Thread.currentThread().getName()+" : "+ITL.get());
        new Thread(new Runnable()...{
            public void run() ...{
                System.out.println(Thread.currentThread().getName()+" : "+ITL.get());
                new Thread(new Runnable()...{
                    public void run() ...{
                        System.out.println(Thread.currentThread().getName()+" : "+ITL.get());
                        ((StringBuffer)ITL.get()).append(", wqf");
                        System.out.println(Thread.currentThread().getName()+" : "+ITL.get());
                    }
                }).start();
                try ...{
                    Thread.sleep(1000);
                } catch (InterruptedException ex) ...{
                    ex.printStackTrace();
                }
                System.out.println(Thread.currentThread().getName()+" : "+ITL.get());
            }}).start();
        try ...{
            Thread.sleep(1000);
        } catch (InterruptedException ex) ...{
            ex.printStackTrace();
        }
        System.out.println(Thread.currentThread().getName()+" : "+ITL.get());
    }

}