笔记：Java实现三个线程A B C，BC线程执行完再执行A线

古城微笑少年丶 2022-05-15 17:28 173阅读 0赞

final Lock lc = new ReentrantLock();
    
    .. run() {
     lc.lock();
    ...
    lc.unlock();
    }
    可能打开方式不对吧,没实现！

改用join() 可以实现(BC与A以单线程模式执行)，代码如下：

package com.w.thread;
    
    import java.util.concurrent.locks.Lock;
    import java.util.concurrent.locks.ReentrantLock;
    
    public class Thread3 implements Runnable {
    
    	final Lock lock = new ReentrantLock();
    
    	private String name;
    
    	public Thread3(String name) {
    		super();
    		this.name = name;
    	}
    
    	@Override
    	public void run() {
    		for (int i = 1; i < 10001; i++) {
    			System.out.println("线程" + name + ":" + i);
    		}
    	}
    
    	public static void main(String[] args) {
    		Thread3 t1 = new Thread3("A");
    		Thread3 t2 = new Thread3("B");
    		Thread3 t3 = new Thread3("C");
    
    		Thread A = new Thread(t1);
    		Thread B = new Thread(t2);
    		Thread C = new Thread(t3);
    
    		try {
    			B.start();
    			B.join();
    			C.start();
    			C.join();
    			A.start();
    			A.join();
    		} catch (InterruptedException e) {
    			e.printStackTrace();
    		}
    	}
    }

不要在生产环境中使用Thread.join()，和没用单线程差不多。