/*Shape類*/

package com.abstract2;

public abstract class Shape {
?? ?
?? ?public abstract void calarea();
?? ?public abstract void calperimeter();
}

/*Rectangle類*/

package com.abstract2;

public class Rectangle extends Shape {
?? ?
?? ?public?? ?double h ;
?? ?public?? ?double w;
?? ?public Rectangle(double h,double w) {
?? ??? ?this.h = h;
?? ??? ?this.w = w;
?? ?}
?? ?@Override
?? ?public void calarea() {
?? ??? ?// TODO Auto-generated method stub
?? ??? ?System.out.println("矩形的area:"+h*w);
?? ?}

?? ?@Override
?? ?public void calperimeter() {
?? ??? ?// TODO Auto-generated method stub
?? ??? ?System.out.println("矩形的perimeter:"+2*(h+w));
?? ?}

}

/*circle類*/

package com.abstract2;

public? class circle extends Shape {
?? ?
?? ?public double r ;
?? ?
?? ?public circle(double r) {
?? ??? ?this.r = r;
?? ?}
?? ?@Override
?? ?public void calarea() {
?? ??? ?// TODO Auto-generated method stub
?? ??? ?System.out.println("圓的area:"+Math.PI*r*r);
?? ?}

?? ?@Override
?? ?public void calperimeter() {
?? ??? ?// TODO Auto-generated method stub
?? ??? ?System.out.println("圓的perimeter:"+Math.PI*2*r);
?? ?}

}

/*測試類*/

package com.abstract2;

public class initial {

?? ?public static void main(String[] args) {
?? ??? ?Shape s1 = new Rectangle (8,6) {
?? ??? ?};
?? ??? ??? ?s1.calarea();
?? ??? ??? ?s1.calperimeter();?? ?
?? ??? ?
?? ??? ?Shape s2 = new circle (2);
?? ??? ??? ?s2.calarea();
?? ??? ??? ?s2.calperimeter();
?? ?}
}