为什么第一行出现了编译错误?

Question

1. public class Exercises3_1 extends Thread implements runable {

2. public void run() {

3. System.out.println("this is run()");

4. }

5. public static void main(String args[]) {

6. Thread t = new Thread(new Exercises3_1());

7. t.start();

8. }

9. }

Answer 1

1.runable写错了，是Runnable
2.继承Thread 或者 实现Runable ，只要有一个就可以了