多线程（九）jion实战demo

深藏阁楼爱情的钟 2022-03-06 06:14 274阅读 0赞

### 需求描述：现在有T1,T2,T3三个线程，你怎么样保证T2在T1执行完毕后执行，T2在T3执行完后执行 ###

### Demo如下（这里要注意的是在调用匿名内部类的时候在调用要用final修饰） ###

package com.zuojie;
    
    /**
     * xu
     * 
     * @author zuojie
     *
     */
    
    public class ThreadDemo07 {
    
    	public static void main(String[] args) {
    		final Thread t1 = new Thread(new Runnable() {
    
    			public void run() {
    				for (int i = 0; i < 20; i++) {
    					System.out.println("T1,i:" + i);
    				}
    			}
    		});
    		t1.start();
    		final Thread t2 = new Thread(new Runnable() {
    
    			public void run() {
    				try {
    					t1.join();
    				} catch (Exception e) {
    					// TODO: handle exception
    				}
    				for (int i = 0; i < 20; i++) {
    					try {
    						Thread.sleep(30);
    					} catch (Exception e) {
    						// TODO: handle exception
    					}
    					System.out.println("T2,i:" + i);
    				}
    			}
    		});
    
    		t2.start();
    		Thread t3 = new Thread(new Runnable() {
    
    			public void run() {
    				try {
    					t2.join();
    				} catch (Exception e) {
    					// TODO: handle exception
    				}
    				for (int i = 0; i < 20; i++) {
    					try {
    						Thread.sleep(30);
    					} catch (Exception e) {
    						// TODO: handle exception
    					}
    					System.out.println("T3,i:" + i);
    				}
    			}
    		});
    
    		t3.start();
    	}
    }

### 运行结果如下 ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L09ubHlvbmVGcmlzdA_size_16_color_FFFFFF_t_70][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L09ubHlvbmVGcmlzdA_size_16_color_FFFFFF_t_70]: /images/20220306/57d891f8e01f498dbcea218d1617c7ff.png