线程实现有两种方法：

1.写一个类来继承Thread类，然后复写run()方法。

public class HelloThread extends Thread {     public void run() {        System.out.println("Hello from a thread!");    }     public static void main(String args[]) {        (new HelloThread()).start();    } }

 

2.写一个类实现Runnable接口，然后复写run()方法。

public classHelloRunnable implements Runnable {    public void run() {        System.out.println("Hello from athread!");    }     public static void main(String args[]) {        (new Thread(newHelloRunnable())).start();    } }