java 多线程之join

t.join();表示当前线程停止执行直到t线程运行完毕；

t.join(1000); 表示当前线程等待t线程运行1000后执行；

package org.thread;/*** t.join()表示当前线程停止执行直到t线程运行完毕* t.join(1000);表示当前线程等待t线程运行1000后执行* @author **/
public class JoinTestDemo2 {public static void main(String[] args) throws InterruptedException{//Delay,in milliseconds before we interrupt MessageLoop//thread(default one hour)long patience = 1000 * 60 * 60;//if command line argument present,gives patience insecondsif(args.length>0){try {patience = Long.parseLong(args[0])*1000;} catch (Exception e) {System.out.println("Argument must be a integer");System.exit(1);}}threadMessage("start MessageLoop thread");long startTime = System.currentTimeMillis();Thread t = new Thread(new MessageLoop());t.start();threadMessage("waiting for messageLoop thread to finish");//loop until MessageLoop thread exitswhile(t.isAlive()){threadMessage("still waiting");//wait maxium of 1 second for MessageLoop thread to finish t.join(); //t.join(1000);if (((System.currentTimeMillis() - startTime) > patience) &&t.isAlive()){threadMessage("Tired of waiting!");t.interrupt();//Should't be long now --wait indefinitelyt.join();}}threadMessage("Finally!");}/*Create a new instance of Test*/public JoinTestDemo2(){}/*Display a message,preceded by the name of the current thread*/static void threadMessage(String message){String threadName = Thread.currentThread().getName();System.out.format("%s:%s%n",threadName,message);}private static class MessageLoop implements Runnable{@Overridepublic void run() {String importantInfo[] = {"Mares eat oats","Does eat oats","Little lambs eat ivy","A kid will eat ivy too"};try {for(int i = 0;i<importantInfo.length;i++){//Pause for 4 secondsThread.sleep(4000);//print a messagethreadMessage(importantInfo[i]);}} catch (Exception e) {threadMessage("I was't done!");}}}}

上述不同代码的运行结果：

颜色对应

init:
deps-jar:
Compiling 1 source file to D:/test/desPatten/build/classes
compile-single:
run-single:
main: Starting MessageLoop thread
main: Waiting for MessageLoop thread to finish
main: Still waiting...
Thread-0: Mares eat oats
Thread-0: Does eat oats
Thread-0: Little lambs eat ivy
Thread-0: A kid will eat ivy too
main: Finally!
生成成功（总时间：17 秒）

init:
deps-jar:
Compiling 1 source file to D:/test/desPatten/build/classes
compile-single:
run-single:
main: Starting MessageLoop thread
main: Waiting for MessageLoop thread to finish
main: Still waiting...
main: Still waiting...
main: Still waiting...
main: Still waiting...
Thread-0: Mares eat oats
main: Still waiting...
main: Still waiting...
main: Still waiting...
main: Still waiting...
Thread-0: Does eat oats
main: Still waiting...
main: Still waiting...
main: Still waiting...
main: Still waiting...
Thread-0: Little lambs eat ivy
main: Still waiting...
main: Still waiting...
main: Still waiting...
main: Still waiting...
Thread-0: A kid will eat ivy too
main: Finally!
生成成功（总时间：17 秒）

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