Java多线程——多线程实例

package thread;

public class ArmyRunnable implements Runnable {
    
	//volatile保证了线程可以正确的读取其他线程写入的值
	//保证可见性,ref JMM,happens-before原则
	//修饰被不同线程访问和修改的变量
	volatile boolean keepRunning = true;
	@Override
	public void run() {
		while(keepRunning){
			for(int i=0;i<5;i++){
				System.out.println(Thread.currentThread().getName()+"["+i+"]");
				//让出了处理器时间，下一次进程的执行是随机的
				Thread.yield();
			}
		}
     System.out.println("结束！");
	}

}
           

package thread;

public class KeyPersonThread extends Thread {
	
	public void run(){
		System.out.println(Thread.currentThread().getName()+"开始了！");
		for(int i=0;i<10;i++){
			System.out.println(Thread.currentThread().getName());
		}
		System.out.println(Thread.currentThread().getName()+"结束了！");
	}
}
           

package thread;

/**
 * 隋唐演义大戏舞台
 */
public class Stage extends Thread {

	public void run() {

		ArmyRunnable armyTaskOfSuiDynasty = new ArmyRunnable();
		ArmyRunnable armyTaskOfRevolt = new ArmyRunnable();

		// 使用Runnable接口创建线程
		Thread armyOfSuiDynasty = new Thread(armyTaskOfSuiDynasty, "小明");
		Thread armyOfRevolt = new Thread(armyTaskOfRevolt, "小红");

		// 启动线程，让军队开始作战
		armyOfSuiDynasty.start();
		armyOfRevolt.start();

		// 线程休眠
		try {
			Thread.sleep(50);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}


		try {
			armyOfRevolt.join();
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		
		System.out.println("来了");
		Thread mrCheng = new KeyPersonThread();
		mrCheng.setName("小黑");
		
		System.out.println("xxx");
		
		//停止线程的方法
		armyTaskOfSuiDynasty.keepRunning = false;
		armyTaskOfRevolt.keepRunning = false;
	    
		try {
			Thread.sleep(2000);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		
		mrCheng.start();
		
		try {
			mrCheng.join();
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		
		System.out.println("结束");
	}

	public static void main(String[] args) {
		new Stage().start();
	}
}