Java 多线程

/**
 1. 创建多线程，继承Thread，重写run()方法
 2. 使用线程：创建子对象 + 对象.start()，线程启动
 */
public class Rabbit extends Thread {
    @Override
    public void run() {
        //线程体
        for (int i = 0; i <= 20; i++) {
            System.out.println("Rabbit has run " + i + " steps.");
        }
    }
}

   class Turtle extends Thread {
        @Override
        public void run() {
            for (int i = 0; i <= 5; i++) {
                System.out.println("Turtle has run " + i + " steps.");
            }
        }
    }

public class Main {

    public static void main(String[] args) {

        Rabbit rabbit = new Rabbit();
        Turtle turtle = new Turtle();

        rabbit.start();     //调用start方法，系统会自动调用run方法，不要直接调用run方法
        turtle.start();     //这样就有两条路径了
    }
}