第2个回答 2012-06-27
class Auto{
int speed;
public void start(){}
public void speedUp(){}
public void stop(){}
}
class Bus extends Auto{
int passenger;
public void getOn(){}
public void getOff(){}
}
class Run{
public static void main(String[] args){
Bus b = new Bus();
b.speed = 1;
b.passenger = 10;
b.start();
b.speedUp();
b.stop();
b.getOn();
b.getOff();//b既有它自己的属性和方法,也有父类的属性和方法
}
}