Java Thread Join方法

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本文通过实例详细解析了Java中Thread类的join方法，包括其作用、使用方法及与start方法结合的示例。通过两个具体代码片段，演示了如何在多线程环境下利用join方法控制线程执行顺序，最终输出了各线程执行的先后顺序。

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In this segment of tutorial we will learn how to use the join method in the Thread.Then We will create an example of Thread with the use of join method.

Java Join method join the next thread at the end of the currentthread
After current thread stops execution then next thread executes.

public class join implements Runnable {

        @Override
        public void run() {
                for (int x = 1; x <= 3; x++) {
                        System.out.println("this is thread "
                                        + Thread.currentThread().getName());
                }
        }

        public static void main(String[] args) throws Exception {
                join j1 = new join();
                Thread t1 = new Thread(j1, "1");
                Thread t2 = new Thread(j1, "2");
                Thread t3 = new Thread(j1, "3");
                t1.start();
                t1.join();
                t2.start();
                t3.start();
        }
}

Output :

this is thread 1this is thread 1this is thread 1this is thread 3this is thread 2this is thread 2this is thread 2this is thread 3this is thread 3

可以在t2.start后面再加个t2.join()看看区别。

再列个例子：

using System;
namespace TestThreadJoin
{
    class Program
    {
       static void Main()
        {
            System.Threading.Thread x = new System.Threading.Thread(new System.Threading.ThreadStart(f1));
            x.Start();
            Console.WriteLine("This is Main.{0}", 1);
            x.Join();
            Console.WriteLine("This is Main.{0}", 2);
            Console.ReadLine();
        }

        static void f1()
        {
            System.Threading.Thread y = new System.Threading.Thread(new System.Threading.ThreadStart(f2));
            y.Start();
            y.Join();
            Console.WriteLine("This is F1.{0}",1);
        }

        static void f2()
        {
           Console.WriteLine("This is F2.{0}", 1);
        }
    }
}

这儿有三个线程在处理(包括主线程),大家可看看执行结果.

结果:

This is Main.1

This is F2.1

This is F1.1

This is Main.2

如果: 注释// x.Join();

结果:

This is Main.1

This is Main.2

This is F2.1

This is F1.1