典型的线程安全

public class A1 {public static ThreadLocal tl = new ThreadLocal(); static Integer a=1;public static void main(String[] args) {for (int i = 0; i < 3; i++) {new Thread() {public void run() {try {synchronized (a) {Thread.sleep(10);tl.set(Thread.currentThread().getName()+"-----"+a++);System.out.println(Thread.currentThread().getName()+"-----"+tl.get());//b.getTl().remove();}} catch (Exception e) {e.printStackTrace();}}}.start();}}}

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