一个多线程例子

class Info {public synchronized void hold() throws InterruptedException {this.wait();}public synchronized void run() {this.notifyAll();}}public class TestThread extends Thread {public int i = 0;public Info info;public int stop = 0;public int start = 0;public int getStop() {return stop;}public void setStop(int stop) {this.stop = stop;}public int getStart() {return start;}public void setStart(int start) {this.start = start;}public TestThread(Info info, int stop, int start) {this.stop = stop;this.start = start;this.info = info;}@Overridepublic void run() {while (i < 20) {if (i == stop) {try {info.hold();} catch (InterruptedException e) {e.printStackTrace();}}if(i==start){info.run();}i++;System.out.println(Thread.currentThread().getName()+":"+i);try {Thread.sleep(1000);} catch (InterruptedException e) {e.printStackTrace();}}}public static void main(String[] args) {Info info = new Info();TestThread t1 = new TestThread(info, 8, -1);TestThread t2 = new TestThread(info,5,-1);TestThread t3 = new TestThread(info,-1,10);t1.setName("a");t2.setName("b");t3.setName("main");t3.start();t1.start();t1.setStop(5);t2.start();}}