關(guān)于抽象類課后思考
public class Circle extends Shape {
?float r=5.0f;
?
@Override
public float zhouchang() {
float zhouchang=3*2*r;
return zhouchang;
}
@Override
public float mianji() {
// TODO Auto-generated method stub
float mianji=3*r*r;
return mianji;
}
public void print(){
System.out.println("圓的周長(zhǎng)為");
}
}
怎么樣才能輸出周長(zhǎng)，
2018-05-19
在mian函數(shù)中定義
Shape shape = new Circle();
float i =? shape.zhouchang();
System.out.println(i);