java中的Semaphore
import java.util.concurrent.Semaphore;public class SubThread extends Thread{private Semaphore semaphore; public SubThread(Semaphore semaphore){ this.semaphore=semaphore; } public Semaphore getSemaphore() { return semaphore; } @Overridepublic void run() {// TODO Auto-generated method stubint i = 0;while( i < 100){i++;System.out.println("No."+i+" Sub thread11111111 is running!");try {Thread.sleep(100);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}semaphore.release();}}

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该线程的利用方法如下：

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    public static void main(String[] args) {        try {            SubThread subThread = new SubThread(new Semaphore(0));            SubThread2 subThread2 = new SubThread2();            SubThread3 subThread3 = new SubThread3();            subThread.start();            subThread.getSemaphore().acquire();        } catch (InterruptedException e) {            e.printStackTrace();        }         System.out.println("Main thread is running!");    }

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?该线程会执行完再执行接下来的代码。

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