java 之 Condition 线程间通信

最新推荐文章于 2025-12-07 21:20:15 发布

原创最新推荐文章于 2025-12-07 21:20:15 发布 · 902 阅读

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本文介绍了一个使用Java实现的线程间通信案例，通过ReentrantLock和Condition机制来控制两个线程之间的交互顺序，确保了主线程和子线程能够按照预设的顺序交替执行。

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import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;


public class ConditionCommunicationTest {

	public static void main(String[] args) {
		final Business business = new Business();
		new Thread(new Runnable() {
			
			@Override
			public void run() {
				for(int i=1;i<=50;i++) {
					business.sub(i);
				}
			}
		}).start();
		
		for(int i=1;i<=50;i++) {
			business.main(i);
		}
	}
	
	static class Business {
		//synchronized 用 lock替代
		Lock lock = new ReentrantLock();
		Condition condition = lock.newCondition();
		
		private boolean bShouldSub = true;//子线程
		
		//处理子线程
		public void sub(int i) {
			lock.lock();
			
			try {
				//如果不是子线程
				while(!bShouldSub) {
					try {
						condition.await();
					} catch(InterruptedException e) {
						e.printStackTrace();
					}
				}
				
				for(int j=1;j<=10;j++) {
					System.out.println("sub thread sequence of "+j + " loop of "+i);
				}
				
				bShouldSub = false;
				condition.signal();
			} finally {
				lock.unlock();
			}
			
		}
		
		//处理子线程
				public synchronized void main(int i) {
					lock.lock();
					try {
						//如果是子线程,主线程等待
						while(bShouldSub) {
							try {
								condition.await();
							} catch(InterruptedException e) {
								e.printStackTrace();
							}
						}
						
						for(int j=1;j<=10;j++) {
							System.out.println("main thread sequence of "+j + " loop of "+i);
						}
						
						bShouldSub = true;
						condition.signal();
					} finally {
						lock.unlock();
					}
					
				}
	}
}

	/*static class Business {
		private boolean bShouldSub = true;//子线程
		
		//处理子线程
		public synchronized void sub(int i) {
			//如果不是子线程
			while(!bShouldSub) {
				try {
					this.wait();
				} catch(InterruptedException e) {
					e.printStackTrace();
				}
			}
			
			for(int j=1;j<=10;j++) {
				System.out.println("sub thread sequence of "+j + " loop of "+i);
			}
			
			bShouldSub = false;
			this.notify();
		}
		
		//处理子线程
				public synchronized void main(int i) {
					//如果是子线程,主线程等待
					while(bShouldSub) {
						try {
							this.wait();
						} catch(InterruptedException e) {
							e.printStackTrace();
						}
					}
					
					for(int j=1;j<=10;j++) {
						System.out.println("main thread sequence of "+j + " loop of "+i);
					}
					
					bShouldSub = true;
					this.notify();
				}
	}
}
*/

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