1.继承Thread类，重载run方法；

Thread t = new Thread(new Runnable() {    @Override    public void run() {        // TODO Auto-generated method stub    }});

2.实现Runnable接口，实现run方法；

public class RunnableDemo implements Runnable {	protected int countDown = 10;	private static int taskCount = 0;	private final int id = taskCount++;	public RunnableDemo() {	}	public RunnableDemo(int countDown) {		this.countDown = countDown;	}	public String status() {		return "#" + id + "(" + (countDown > 0 ? countDown : "LiftOff!") + ").";	}	@Override	public void run() {		while (countDown-- > 0) {			System.out.print(status());			Thread.yield();// 将CPU从一个线程转移给另一个线程		}	}	public static void main(String[] args) {		System.out.println("这个任务的run()不是单独的线程驱动，是在main()中直接调用");		RunnableDemo launch = new RunnableDemo();		launch.run();		System.out.println();		System.out.println("************************************");		System.out.println("在新线程中启动任务");		Thread thread = new Thread(new RunnableDemo());		thread.start();		System.out.println("Waiting for LiftOff");		System.out.println("************************************");		System.out.println("添加多个线程去驱动更多的任务");		for (int i = 0; i < 5; i++) {			new Thread(new RunnableDemo()).start();		}		System.out.println("Waiting for LiftOff");		System.out.println("************************************");		System.out.println("使用executor");		ExecutorService exec = Executors.newCachedThreadPool();		exec=Executors.newFixedThreadPool(5);		for (int i = 0; i < 5; i++) {			exec.execute(new RunnableDemo());		}		exec.shutdown();				Thread t=new Thread(new Runnable() {						@Override			public void run() {				// TODO Auto-generated method stub							}		});	}}