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Java多線程中關(guān)于join方法的使用實例解析

更新時間：2017年01月08日 14:32:48 作者：52Hz

本文通過實例代碼給大家實例介紹了Java多線程中關(guān)于join方法的使用，非常不錯，具有參考借鑒價值，需要的朋友參考下

先上代碼

新建一個Thread,代碼如下:

package com.thread.test;
public class MyThread extends Thread {
  private String name;
  public MyThread(String name) {
    this.name = name;
  }
  @Override
  public void run() {
    for (int i = 0; i < 100; i++) {
      System.out.println(name+"["+i+"]");
    }
    super.run();
  }
}

之后新建測試類,代碼如下:

package com.thread.test;
/*
 * 0-50執(zhí)行的是主線程,50-100執(zhí)行的是A線程,并且將A線程完全執(zhí)行完后才繼續(xù)執(zhí)行主線程
 */
public class ThreadDemo{
  public static void main(String[] args) {
    MyThread t = new MyThread("A");
    t.start();
    for (int i = 0; i < 100; i++) {
      if (i>50) {
        try {
          t.join();
        } catch (InterruptedException e) {
          e.printStackTrace();
        }
      }
      System.out.println("主線程"+"["+i+"]");
    }
  }
}

下面是Java Platform SE8 API中對Thread中Join方法的解釋:

public final void join(long millis)
        throws InterruptedExceptionWaits at most millis milliseconds for this thread to die. A timeout of 0 means to wait forever. 
This implementation uses a loop of this.wait calls conditioned on this.isAlive. As a thread terminates the this.notifyAll method is invoked. It is recommended that applications not use wait, notify, or notifyAll on Thread instances.
Parameters: 
millis - the time to wait in milliseconds 
Throws: 
IllegalArgumentException - if the value of millis is negative 
InterruptedException - if any thread has interrupted the current thread. The interrupted status of the current thread is cleared when this exception is thrown.

先上代碼

新建一個Thread,代碼如下:

package com.thread.test;
public class MyThread extends Thread {
  private String name;
  public MyThread(String name) {
    this.name = name;
  }
  @Override
  public void run() {
    for (int i = 0; i < 100; i++) {
      System.out.println(name+"["+i+"]");
    }
    super.run();
  }
}

之后新建測試類,代碼如下:

package com.thread.test;
/*
 * 0-50執(zhí)行的是主線程,50-100執(zhí)行的是A線程,并且將A線程完全執(zhí)行完后才繼續(xù)執(zhí)行主線程
 */
public class ThreadDemo{
  public static void main(String[] args) {
    MyThread t = new MyThread("A");
    t.start();
    for (int i = 0; i < 100; i++) {
      if (i>50) {
        try {
          t.join();
        } catch (InterruptedException e) {
          e.printStackTrace();
        }
      }
      System.out.println("主線程"+"["+i+"]");
    }
  }
}

下面是Java Platform SE8 API中對Thread中Join方法的解釋:

public final void join(long millis)
        throws InterruptedExceptionWaits at most millis milliseconds for this thread to die. A timeout of 0 means to wait forever. 
This implementation uses a loop of this.wait calls conditioned on this.isAlive. As a thread terminates the this.notifyAll method is invoked. It is recommended that applications not use wait, notify, or notifyAll on Thread instances.
Parameters: 
millis - the time to wait in milliseconds 
Throws: 
IllegalArgumentException - if the value of millis is negative 
InterruptedException - if any thread has interrupted the current thread. The interrupted status of the current thread is cleared when this exception is thrown.

我自己的理解就是會強行進入使用join方法的線程，其他線程等待該線程完全執(zhí)行完后才會進來。

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