方法一： 继承Thread

import java.io.IOException;

/**
 * 方法一： 继承Thread
 */
public class M01ExtentThread {

    public static void main(String[] args) throws IOException {
        M01ExtentThread test = new M01ExtentThread();
        MyThread thread1 = test.new MyThread();
        MyThread thread2 = test.new MyThread();
        thread1.setName("线程1");
        thread2.setName("线程2");
        thread1.start();
        thread2.start();
        System.out.println("主线程输出");
    }

    class MyThread extends Thread{
        @Override
        public void run() {
            for(int i = 0; i < 3; i++) {
                System.out.println(Thread.currentThread().getName()+"线程输出"+i);
            }
        }
    }
}