【java选修】线程

class A implements Runnable {
	public void run() {
		System.out.println("A开始");
	}
}
class B extends Thread{
	public void run(){
		System.out.println("B开始");
	}
}


public class Java_class  {
	public static void main(String[] args)  {
		A a=new A();
		Thread thread=new Thread(a);
		thread.start();
		
		B b=new B();
		b.start();
	}
	
}