Java（18）：多线程的启用

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后台技术汇 2022-09-02 20:38:59 博主文章分类：Java ©著作权

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日期：2017/11/10

Java常用的多线程方法有两个：

（1）继承Thread类+重写run方法，在mian()中用start()方法调用启动；

代码例子如下：

package com.thread;

public class MyThread  extends Thread{
  private String name;
  
  public MyThread(String name){
    this.name = name;
  }
  
  public void run(){
    for (int i=10; i<1010; i++){
      System.out.println(name +": "+i);
    }
//    super.run();
  }

}

package com.thread;


public class ThreadTest {


  public static void main(String[] args) {
    MyThread thread = new MyThread("Thread Test One");
    MyThread threadtwo = new MyThread("Thread Test Two");
    //线程的启动不是通过run方法（调用）
    //thread.run();
    thread.start();
    threadtwo.start();
    System.out.println("**********");
    
    //another way to realize Thread
    MyRunnable myrunnable1 = new MyRunnable("A");
    MyRunnable myrunnable2 = new MyRunnable("B");
    Thread t1 = new Thread(myrunnable1);
    Thread t2 = new Thread(myrunnable2);
    t1.start();
    t2.start();
  }


}

mian()中新建Thread引用并使用start()方法调用启动；

代码例子：

package com.thread;

class ThreadDemo implements Runnable{
  private String name;
  public ThreadDemo(String name){
    this.name = name;
  }
  public void run() {
    for (int i = 0; i<50; i++){
      try{
        Thread.sleep(1000);
        System.out.println(Thread.currentThread().getName()+": "+i);
      }catch(InterruptedException e){
        e.printStackTrace();
      }
    }
    
  }
  
}

public class ThreadTestThree {

  public static void main(String[] args) {
    //使用匿名对象，创建线程更加方便
    Thread t1 = new Thread(new ThreadDemo("A"),"A");
    Thread t2 = new Thread(new ThreadDemo("B"),"B");
    Thread t3 = new Thread(new ThreadDemo("C"),"C");
//    t1.setPriority(Thread.MAX_PRIORITY);
    t1.setPriority(Thread.MIN_PRIORITY);
    t2.setPriority(Thread.NORM_PRIORITY);
    t3.setPriority(Thread.MAX_PRIORITY);
    t1.start();
    t2.start();
    t3.start();
    
  }

}