java大神请指教

Question

package com.imooc;

import java.util.Scanner;

import java.lang.Math;

public abstract class Shape {//父类shape

double a;

double b;

double r;

public abstract void c();

public abstract void s();

public void Shape(){

Scanner input1=new Scanner(System.in);

Scanner input2=new Scanner(System.in);

System.out.print("请输入长a");

double a1=input1.nextDouble();

System.out.println();

System.out.print("请输入宽b");

double b1=input2.nextDouble();

System.out.println();

Scanner input3=new Scanner(System.in);

System.out.print("请输入圆的半径");

double r=input3.nextDouble();

}

}

2.子类Circle

package com.imooc;

import java.util.Scanner;

public class Circle extends Shape {

@Override

public void c() {

// TODO Auto-generated method stub

double r=super.r;

double c=2*Math.PI*r;

System.out.println("圆的周长为"+c);

}

@Override

public void s() {

double r=super.r;

double s=Math.PI*r*r;

System.out.println("圆的面积为"+s);

}

}

3.子类Retangle

package com.imooc;

import java.util.Scanner;

public class Retangle extends Shape {

@Override

public void c() {

// TODO Auto-generated method stub

double a=super.a;

double b=super.b;

double c=2*(a+b);

System.out.println("长方形的周长为"+c);

}

@Override

public void s() {

// TODO Auto-generated method stub

// TODO Auto-generated method stub

double a=super.a;

double b=super.b;

double s=a*b;

System.out.println("长方形的面积为"+s);

}

}

4.测试类Inital

package com.imooc;

public class Iniatal {

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

Shape h1=new Retangle();

h1.c();

h1.s();

Shape h2=new Circle();

h2.c();

h2.s();

}

}

结果得到的怎么是全零，我不是做了外界输入参数的值吗，请问问题出在哪里？

Answer 1

1.父类shape的shape方法应该是构造方法，没有void；2.键盘得到的值应该直接赋给全局变量

Answer 2

多谢，问题解决部分，另外请问我怎么实现在输入a,b,r后依次得到长方形的周长，面积以及圆的周长，面积。我输入abr后得到了长方形的周长面积，系统又让我输入一次abr才能得到圆的周长面积，怎么把后面一次输入去掉？