abstract class Graphic{
String name;
public Graphic(String name){
this.name=name;
}
abstract public void getlength();
abstract public void getArea();
}
class Circle extends Graphic{
public static final double PI=3.14159;
double r;
public Circle(String name,double r){
super(name);
this.r=r;
}
public void getlength(){
System.out.println("圆的面积为 "+PI*r*r);
}
public void getArea(){
System.out.println("圆的周长为"+2*PI*r);
}
}
class Recet extends Graphic{
int length;
int width;
public Recet(String name,int length,int width){
super(name);
this.length=length;
this.width=width;
}
public void getlength(){
System.out.println("矩行的面积为 "+length*width);
}
public void getArea(){
System.out.println("矩形的周长为"+2*(length+width));
}
}
public class demo1 {
public static void main(String[]args){
Circle c=new Circle("圆",5.00);
c.getlength();
c.getArea();
}
}
抽象类的调用
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转载自www.cnblogs.com/qq275316449-/p/10882969.html
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