ThreadLocal的使用

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public class TestThreadLocal {private static ThreadLocal<Integer> tl = new ThreadLocal<Integer>(){protected Integer initialValue() {return 0;};};public int getNext() {tl.set(tl.get() + 1);return tl.get();}public static void main(String[] args) {//线程共享testThreadLocal对象，此对象中有 ThreadLocal<Integer> tl//ThreadLocal通过ThreadLocalMap为每个线程创建一个Integer对象的副本TestThreadLocal testThreadLocal = new TestThreadLocal();Thread thread1 = new Thread(new MyThread(testThreadLocal), "t1");Thread thread2 = new Thread(new MyThread(testThreadLocal), "t2");thread1.start();thread2.start();}private static class MyThread implements Runnable {private TestThreadLocal t;public MyThread(TestThreadLocal t) {this.t = t;}@Overridepublic void run() {for(int i = 0; i < 3; i++) {System.out.println(Thread.currentThread().getName() + "-" + t.getNext());}}}}

运行结果如下：

t1-1
t2-1
t1-2
t2-2
t1-3
t2-3

可以看出，各个线程的局部变量的值互不干扰~

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