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join函数的作用，是让当前线程等待，直到调用join（）的 线程结束或者等到一段时间，我们来看以下代码
1 package mian; 2 3 4 public class simpleplela { 5 static void threadMessage(String message) { 6 String threadName = 7 Thread.currentThread().getName(); 8 9 System.out.println(threadName+" "+message 10 ); 11 } 12 13 private static class MessageLoop 14 implements Runnable { 15 public void run(){ 16 17 18 String importantInfo[] = { 19 "ONe", 20 "TWo", 21 "THREe", 22 "four" 23 }; 24 try{ 25 for(int i = 0; 26 i<importantInfo.length; 27 i++){ 28 Thread.sleep(4000); 29 threadMessage(importantInfo[i]); 30 } 31 } 32 catch(InterruptedException e){ 33 threadMessage("I was‘nt done!"); 34 } 35 } 36 } 37 public static void main(String args[]) 38 throws InterruptedException { 39 long patience = 1000*10; 40 if(args.length>0){ 41 try{ 42 patience = Long.parseLong(args[0])*1000; 43 }catch(NumberFormatException e){ 44 System.err.println("Argument must be an integer"); 45 System.exit(1); 46 } 47 } 48 threadMessage("Starting MessageLoop Thread"); 49 long startTime = System.currentTimeMillis(); 50 Thread t = new Thread(new MessageLoop()); 51 t.start(); 52 threadMessage("Waiting for MEssageLoop Thread to finish"); 53 while((t.isAlive())){ 54 threadMessage("still waiting..."); 55 56 t.join(); 57 if (((System.currentTimeMillis() - startTime) > patience) 58 && t.isAlive()) { 59 threadMessage("Tired of waiting!"); 60 t.interrupt(); 61 // Shouldn‘t be long now 62 // -- wait indefinitely 63 t.join(); 64 } 65 } 66 threadMessage("Finally!"); 67 } 68 69 }
输出如下
1 package mian; 2 3 4 public class simpleplela { 5 static void threadMessage(String message) { 6 String threadName = 7 Thread.currentThread().getName(); 8 9 System.out.println(threadName+" "+message 10 ); 11 } 12 13 private static class MessageLoop 14 implements Runnable { 15 public void run(){ 16 17 18 String importantInfo[] = { 19 "ONe", 20 "TWo", 21 "THREe", 22 "four" 23 }; 24 try{ 25 for(int i = 0; 26 i<importantInfo.length; 27 i++){ 28 Thread.sleep(4000); 29 threadMessage(importantInfo[i]); 30 } 31 } 32 catch(InterruptedException e){ 33 threadMessage("I was‘nt done!"); 34 } 35 } 36 } 37 public static void main(String args[]) 38 throws InterruptedException { 39 long patience = 1000*10; 40 if(args.length>0){ 41 try{ 42 patience = Long.parseLong(args[0])*1000; 43 }catch(NumberFormatException e){ 44 System.err.println("Argument must be an integer"); 45 System.exit(1); 46 } 47 } 48 threadMessage("Starting MessageLoop Thread"); 49 long startTime = System.currentTimeMillis(); 50 Thread t = new Thread(new MessageLoop()); 51 t.start(); 52 threadMessage("Waiting for MEssageLoop Thread to finish"); 53 while((t.isAlive())){ 54 threadMessage("still waiting..."); 55 56 t.join(1000); 57 if (((System.currentTimeMillis() - startTime) > patience) 58 && t.isAlive()) { 59 threadMessage("Tired of waiting!"); 60 t.interrupt(); 61 // Shouldn‘t be long now 62 // -- wait indefinitely 63 t.join(); 64 } 65 } 66 threadMessage("Finally!"); 67 } 68 69 }
输出如下 我们分析一下，两段代码只有一行不一样。第一段是t.join()，会让当前线程（例子中为主线程）一直等待，知道t结束；
第二段是t.join(1000),会让当前线程等待1000毫秒，之后继续。
thread.join函数，java多线程中的join函数解析,布布扣,bubuko.com
thread.join函数，java多线程中的join函数解析
标签：style blog http color java os io for
原文地址：http://www.cnblogs.com/qingdu/p/3890916.html
