1.[代碼]CountDownLatch控制主線程等子線程執行完--Java多線程

package com.sihuatech.common;

import java.util.concurrent.CountDownLatch;

/**

* 執行線程

*

* @author lei 2011-7-28

*/

class ImportThread extends Thread {

private CountDownLatch threadsSignal;

public ImportThread(CountDownLatch threadsSignal) {

this.threadsSignal = threadsSignal;

}

@Override

public void run() {

System.out.println(Thread.currentThread().getName() + "開始...");

// Do somethings

threadsSignal.countDown();// 線程結束時計數器減1

System.out.println(Thread.currentThread().getName() + "結束. 還有" + threadsSignal.getCount() + " 個線程");

}

}

/**

* 測試方法

*

* @author lei 2011-7-28

*/

public class Test {

public static void main(String[] args) {

int threadNum = 10;

CountDownLatch threadSignal = new CountDownLatch(threadNum);// 初始化countDown

for (int ii = 0; ii < threadNum; ii++) {// 開threadNum個線程

Thread t = new ImportThread(threadSignal);

t.start();

}

try {

threadSignal.await();// 等待所有子線程執行完

} catch (InterruptedException e) {

e.printStackTrace();

}

System.out.println(Thread.currentThread().getName() + "結束.");

}

}

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