java 多线程同步+通信-优快云博客

本文链接：https://blog.youkuaiyun.com/luobing_csdn/article/details/84811869

本文介绍了一个使用Java实现的父子线程交替打印特定次数的案例。通过synchronized关键字和wait/notify机制来协调主线程与子线程之间的运行顺序，确保两者能够按照预期的顺序交替执行。

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/**
 *父子线程 交替打印10 次, 100次    如此循环 n次
 */
public class TraditionalThreadCommunication {
	static boolean isSubRun=true;
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		/*new Thread(
			 new Runnable() {

				@Override
				public void run() {
					int num=0;
					synchronized (TraditionalThreadCommunication.class) {
						while (num<=4) {
							if(!isSubRun){
								try {
									TraditionalThreadCommunication.class.wait();
								} catch (InterruptedException e) {
									// TODO Auto-generated catch block
									e.printStackTrace();
								}
							}
							for (int i = 0; i < 10; i++) {
								System.out.println(Thread.currentThread().getName()+" run "+i);
							}
							isSubRun=false;
							TraditionalThreadCommunication.class.notify();
							num++;
						}
					}
				}
			}
		).start();

		new Thread(
				new Runnable(){
					@Override
					public void run() {
						int num=0;
						while(num<=4){
							synchronized (TraditionalThreadCommunication.class) {
								if(isSubRun){
									try {
										TraditionalThreadCommunication.class.wait();
									} catch (InterruptedException e) {
										// TODO Auto-generated catch block
										e.printStackTrace();
									}
								}
								for (int i = 0; i < 100; i++) {
									System.out.println(Thread.currentThread().getName()+" run "+i);
								}

								isSubRun=true;
								TraditionalThreadCommunication.class.notify();
								num++;
							}

						}
					}

				}

		).start();*/

		final Business bus=new Business();
		new Thread(){
			@Override
			public void run() {
				for (int i = 1; i < 5; i++) {
					bus.sub(i);
				}
			}
		}.start();

		new Thread(new Runnable(){
			@Override
			public void run() {
				for (int i = 1; i < 5; i++) {
					bus.main(i);
				}
			}
		}).start();

	}



}

class Business{
	private boolean sShouldSub=true;
	public synchronized void sub(int i){
		if(!sShouldSub){  //这里换成 while  比 if  更安全 , 健壮
			try {
				this.wait();
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		for (int j = 1; j <= 10; j++) {
			System.out.println("Sub thread sequence of "+j+" loop of"+i);
		}
		sShouldSub=false;
		this.notify();
	}

	public synchronized void main(int i){
		while(sShouldSub){//这里换成 while 比 if  更安全 , 健壮 
			try {
				this.wait();
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}

		for (int j = 0; j < 100; j++) {
			System.out.println("Main thread sequence of "+j+" loop of"+i);
		}
		sShouldSub=true;
		this.notify();
	}

}