2-8自由编程

编程如下，运行出来只有一种结果，是我代码哪里有问题吗？还是我的编译器运行有问题呀？

package imooc.com.thread;

//2-8 自由编程

class Cat implements Runnable {

@Override

public void run() {

// TODO Auto-generated method stub

for (int i = 0; i < 3; i++) {

System.out.println(Thread.currentThread().getName() + "A cat");

}

}

}

class Dog implements Runnable {

@Override

public void run() {

// TODO Auto-generated method stub

for (int i = 0; i < 3; i++) {

System.out.println(Thread.currentThread().getName() + "A dog");

}

}

}

public class Free2 {

public static void main(String[] args) {

Cat cat = new Cat();

Thread th1 = new Thread(cat);

th1.start();

Dog dog = new Dog();

Thread th2 = new Thread(dog);

th2.start();

for (int i = 0; i < 3; i++) {

System.out.println("main thread");

}

}

}

运行结果：

Thread-0A cat

Thread-0A cat

Thread-0A cat

main thread

main thread

main thread

Thread-1A dog

Thread-1A dog

Thread-1A dog