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Thread是实现了Runnable接口的类，使得run支持多线程

继承Thread 类并重写run方法

public class MyThread extends Thread {
   		private String name;	public MyThread(String name) {
   		this.name = name;	}		@Override	public void run() {
   		System.out.println("welcome to "+this.name);	}}

实现Runnable 接口并重写run方法

public class MyRunnable implements Runnable {
   	private String name;		public MyRunnable(String name) {
   		this.name = name;	}	public void run() {
   		System.out.println("welcome to "+this.name);	}}

public class ThreadTest {
   		public static void main(String[] args) {
   		MyThread myThread = new MyThread("线程A");		MyThread myThread2 = new MyThread("线程B");		MyThread myThread3 = new MyThread("线程C");		myThread.start();		myThread2.start();		myThread3.start();		MyRunnable run1 = new MyRunnable("RunA");		MyRunnable run2 = new MyRunnable("RunB");		MyRunnable run3 = new MyRunnable("RunC");		Thread t1 = new Thread(run1);		Thread t2 = new Thread(run2);		Thread t3 = new Thread(run3);		t1.start();		t2.start();		t3.start();	}}

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