圖形類

package com.chy3.practice;

public abstract class Shape {

public abstract String square(double a,double b);

public abstract String circumFerence(double a,double b);

}

矩形類

package com.chy3.practice;

import java.util.Scanner;

public class Rectangle extends Shape {

Scanner input = new Scanner(System.in);

public void cal(){

System.out.println("計算矩形周長和面積");

System.out.println("請輸入兩條邊長");

double stre1 = input.nextDouble();

double stre2 = input.nextDouble();

System.out.println("周長為：? "+circumFerence(stre1, stre2));

System.out.println("面積為：? "+square(stre1, stre2));

}

@Override

public String square(double a,double b) {

// TODO Auto-generated method stub

double squ = a*b;

return "矩形面積為："+squ;

}

@Override

public String circumFerence(double a,double b) {

// TODO Auto-generated method stub

double cif = (a+b)*2;

return "矩形周長為"+cif;

}

}

圓形類

package com.chy3.practice;

import java.lang.Math;

import java.util.Scanner;

public class Circle extends Shape {

Scanner input = new Scanner(System.in);

Double p = Math.PI;

public void cal(){

System.out.println("計算圓形的周長和面積");

System.out.println("請輸入半徑和直徑");

double r = input.nextDouble();

double d = input.nextDouble();

System.out.println("周長為：? "+circumFerence(r, d));

System.out.println("面積為：? "+square(r, d));

}

@Override

public String square(double a,double b) {

// TODO Auto-generated method stub

double squ = p*a*a;

return "圓的面積為"+squ;

}

@Override

public String circumFerence(double a,double b) {

// TODO Auto-generated method stub

double cif = 2*p*b;

return "圓的周長為"+cif;

}

}

實現類

package com.chy3.practice;

public class Initial {

public static void main(String[] args){

System.out.println("計算開始：");

Rectangle rec = new Rectangle();

rec.cal();

Circle cir = new Circle();

cir.cal();

}

}