Java主线程等待子线程完成

import static java.lang.Thread.sleep;

/**
    *
    * @author Gao Youbo
    * @since 2014-05-16 10:20:08
    */
public class Test {

    public static void main(String[] args) {
        SubThread thread = new SubThread();
        thread.start(); //子线程开始
        mainThreadWorking();//主线程干活
        System.out.println("main:等待子线程完成");
        try {
            thread.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println("所有线程都完成！");
    }

    private static void mainThreadWorking() {
        System.out.println("main:主线程开始干活...");
        try {
            Thread.sleep(2000L);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println("main:主线程干完了!");
    }
}

class SubThread extends Thread {

    @Override
    public void run() {
        try {
            System.out.println("sub:子线程开始干活...");
            sleep(6000L); //子线程花6秒钟时间干活
            System.out.println("sub:子线程干完了!");
        } catch (InterruptedException ex) {
            ex.printStackTrace();
        }
    }

}