多线程之Join方法

小灰灰 2022-08-13 12:51 254阅读 0赞

线程加入：join()方法，等待其他线程终止。在当前线程中调用另一个线程的join()方法，则当前线程转入阻塞状态，直到另一个进程运行结束，当前线程再由阻塞转为就绪状态。

package thread;
    
    public class ThreadJoinTest {
    
    	/**
    	 * @param args
    	 */
    	public static void main(String[] args) {
    		ThreadJoin tj = new ThreadJoin();
    		Thread t1 = new Thread(tj);
    		NormalThread nt = new NormalThread(t1);
    		Thread t2 = new Thread(nt);
    		t1.start();
    		t2.start();
    		
    	}
    
    }
    
    
    class ThreadJoin implements Runnable {
    
    	@Override
    	public void run() {
    		for (int i=0;i<10;i++) {
    			System.out.println(Thread.currentThread().getName() + "-->" + i);
    			try {
    				Thread.sleep(500);
    			} catch (InterruptedException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    		}
    	}
    	
    }
    class NormalThread implements Runnable {
    	private Thread t;
    	NormalThread(Thread t) {
    		this.t = t;
    	}
    	@Override
    	public void run() {
    		for (int i=0;i<10;i++) {
    			System.out.println(Thread.currentThread().getName() + "-->" + i);
    			try {
    				Thread.sleep(500);
    			} catch (InterruptedException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    			
    			if (i == 3) {
    				try {
    					t.join(); // 会使当前线程暂停运行，知道t运行完毕
    				} catch (InterruptedException e) {
    					// TODO Auto-generated catch block
    					e.printStackTrace();
    				}
    			}
    		}
    	}
    	
    }

运行结果：

Thread-0-->0

Thread-1-->0

Thread-0-->1

Thread-1-->1

Thread-1-->2

Thread-0-->2

Thread-0-->3

Thread-1-->3

Thread-0-->4

Thread-0-->5

Thread-0-->6