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                        /Java入门第二季 升级版

代码有点小毛病，不能分开赋值，求大佬指点

父类

package project55;

public abstract class Shape {

public abstract void c(int a,int b,int r);

public abstract void s(int a,int b,int r);

}

矩形

package project55;

public class Rectangle extends Shape {

@Override

public void c(int a,int b,int r) {

// TODO Auto-generated method stub

System.out.println("矩形周长:"+(a+b)*2);

}

@Override

public void s(int a,int b,int r) {

// TODO Auto-generated method stub

System.out.println("矩形面积："+a*b);

}

圆形

package project55;

public class Circle extends Shape {

double π=3.14;

@Override

public void c(int a,int b,int r) {

// TODO Auto-generated method stub

System.out.println("圆形的周长:"+π*r*2);

}

@Override

public void s(int a,int b,int r) {

// TODO Auto-generated method stub

System.out.println("圆形的面积:"+π*r*r);

}

Initail函数

package project55;

import java.util.Scanner;

public class Initail {

public static void main(String[] args) {

// TODO Auto-generated method stub

Scanner input=new Scanner(System.in);

System.out.print("请输入矩形的长a:");

int a=input.nextInt();

System.out.print("请输入矩形的宽b:");

int b=input.nextInt();

System.out.print("请输入圆形半径r:");

int r=input.nextInt();

Shape shape1=new Rectangle();

shape1.c(a,b,r);

shape1.s(a,b,r);

Shape shape2=new Circle();

shape2.c(a,b,r);

shape2.s(a,b,r);

}

结果

请输入矩形的长a:4

请输入矩形的宽b:5

请输入圆形半径r:6

矩形周长:18

矩形面积：20

圆形的周长:37.68

圆形的面积:113.03999999999999

慕慕3418381

2018-08-20

源自：Java入门第二季升级版 10-3

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2 回答

慕后端1338084
2018-08-21

你的方法参数写错了。正方形的参数传两个，圆形的传一个就可以了。main方法中，调用类方法时，用相应的子类去声明对象，调用本类的方法。一下是我的代码，可运行

package j2ee;

import java.util.Scanner;

public class HelloWord{
   public static void main(String[] args) {
   Scanner input = new Scanner(System.in);
   System.out.print("请输入矩形的长a:");
   int a = input.nextInt();
   System.out.print("请输入矩形的宽b:");
   int b = input.nextInt();
   System.out.print("请输入圆形的半径r");
   int r = input.nextInt();

   rectangle s1 = new rectangle();
   s1.c(a,b);
   s1.s(a,b);

   circle s2 = new circle();
   s2.c(r);
   s2.s(r);
   }
}


package j2ee;

public abstract class shape {
public void r(){};
public void s(){};
}

package j2ee;
import java.util.Scanner;
public class rectangle extends shape {
public void c(int a,int b){
      System.out.println(2*(a+b));
}
public void s(int a,int b){
      System.out.println(a*b);
}

}


package j2ee;

public class circle extends shape {
   double π=3.14;
   public void c(int r){
          System.out.println(2*π*r);
      }
      public void s(int r){
      System.out.println(π*r*r);
      }
}