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HomeJavajavaTutorialImplementation method of multi-threading based on java learning

这篇文章介绍基于java学习中多线程的实现方法

1 继承Thread类

继承Thread类的方法尽管被我列为一种多线程实现方式,但Thread本质上也是实现了Runnable接口的一个实例,它代表一个线程的实例,并且,启动线程的唯一方法就是通过Thread类的start()实例方法。start()方法是一个native方法,它将启动一个新线程,并执行run()方法。这种方式实现多线程很简单,通过自己的类直接extend Thread,并复写run()方法,就可以启动新线程并执行自己定义的run()方法。

public class MyThread extends Thread {  
  public void run() {  
   System.out.println("MyThread.run()");  
  }  
} 
 //启动线程
MyThread myThread1 = new MyThread();  
MyThread myThread2 = new MyThread();  
myThread1.start();  
myThread2.start();

2 实现Runnable接口

如果一个类继承另一个类,就无法继承Thread类(java中不支持多继承),这样就要实现Runnable接口,在实现类中重写run()方法,在main方法中实现多线程:实例化一个实现类对象,并初始化Thread类的对象,把实现类传入到Thread的对象里。事实上,当传入一个Runnable target参数给Thread后,Thread的run()方法就会调用target.run()。

//实现Runnable接口
public class MyThread extends OtherClass implements Runnable {  
  public void run() {  
   System.out.println("MyThread.run()");  
  }  
}  
//复写run()方法
public void run() {  
  if (target != null) {  
   target.run();  
  }  
} 
//实例化对象
MyThread myThread = new MyThread();  
Thread thread = new Thread(myThread);  
thread.start();

3 使用ExecutorService、Callable、Future实现有返回结果的多线程

该部分内容还未学到占时不作记录,以后补充


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