Java接口

设有图形,矩形,立方体,圆,圆柱根据自己的理解给出他们之间的关系

1.每种图形都有计算面积,周长,显示信息,获取图形名称的方法

2.设计一个主方法,其功能是求n个图形的面积之和

package classwork7;

public interface Js {
      public double S();//面积
      public double C();//周长
      public String output();//信息输出
}
package classwork7;

public interface Js2 {
    public double V();//体积
    public double BS();//表面积
    public String output();//信息输出
}
package classwork7;

public class Shape {
       private String name;

    public Shape() {
        
    }

    public Shape(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }
       
}
package classwork7;

public class Rectangle extends Shape implements Js {
     private double a,b;   
     public Rectangle(double a, double b) {
     super("矩形");
        this.a = a;
        this.b = b;
    }
    

    public Rectangle() {
         super("矩形");
    }
    

    public double getA() {
        return a;
    }


    public double getB() {
        return b;
    }


    @Override
    public double S() {
       double c=a*b;
        return c;
    }

    @Override
    public double C() {
        return (a+b)*2;
    }
    

    @Override
    public String output() {
          String s="";
          s=getName()+"信息:长="+a+"宽="+b+"面积="+S()+"周长="+C();
        return s;
    }

}
package classwork7;

public class Cube extends Shape implements Js2 {
    private double h;
    private double a,b;
    Rectangle c=new Rectangle(a,b);
    public Cube(double a, double b,double h) {
        super("立方体");
        this.a=a;
        this.b=b;
        this.h=h;
        
    }
    
    public Cube() {
        super("立方体");
    }
    @Override
    public double BS() {
        return (c.S()+a*h+b*h)*2;
    }
    @Override
    public double V() {
        return c.S()*h;
    }
    @Override
    public String output() {
          String s="";
          s=getName()+"信息:长="+a+"宽="+b+"表面积="+BS()+"体积="+V();
        return s;
    }
}
package classwork7;

public class Circle extends Shape implements Js {
    private double r;     
    public Circle() {
    super("圆");    
    }
    
    public Circle(double r) {
        super("圆");    
        this.r = r;
    }

    public double getR() {
        return r;
    }

    @Override
    public double S() {
        
        return Math.PI*r*r;
    }

    @Override
    public double C() {
    
        return 2*r*Math.PI;
    }
    
    @Override
    public String output() {
        String s="";
        s=getName()+"信息:半径="+r+"面积="+S()+"周长="+C();
        return s;
    }
     
}
package classwork7;

public class Clinder extends Shape implements Js2 {
     private double h;
     private double r;
     Circle a=new Circle(r);
        public  Clinder() {
            super("圆柱");
        }
        public  Clinder( double r,double h) {
            super("圆柱");
            this.r = r;
            this.h = h;
        }
        @Override
        public double BS() {
            return a.S()*2+a.C()*h;
        }
        @Override
        public double V() {
            return a.S()*h;
        }

    @Override
    public String output() {
        String s="";
        s=getName()+"信息:半径为:"+r+"圆柱的高为:"+h+"表面积="+BS()+"体积="+V();
        return s; 
    }
    

}
package classwork7;

import java.util.Scanner;

public class Manger_rccc {

    public void menu() {
        int i = 0;
        while (i != 7) {
            System.out.println("***图形类对象的管理***");
            System.out.println("----------------");
            System.out.println("1.创建一个圆");
            System.out.println("2.创建一个矩形");
            System.out.println("3.创建一个立方体");
            System.out.println("4.创建一个圆柱体");
            System.out.println("5.显示已创建的图形");
            System.out.println("6.求各图形的面积之和");
            System.out.println("7.退出系统");
            Scanner in = new Scanner(System.in);
            i = in.nextInt();
            switch (i) {
            case 1:
                CreateCircle();
                break;
            case 2:
                CreateRectangle();
                break;
            case 3:
                CreateCube();
                break;
            case 4:
                CreateClinder();
                break;
            case 5:
                show();
                break;
            case 6:
                sum();
                break;
            case 7:
                break;
            default:
                System.out.println("请输入正确指令");
                break;
            }
        }
    }

    Circle a = new Circle();
    Rectangle b = new Rectangle();
    Cube c = new Cube();
    Clinder d = new Clinder();

    public void CreateCircle() {
        Circle e = new Circle(2);
        System.out.println("已创建一个半径为2的圆形");
        a=e;
    }

    public void CreateRectangle() {
        Rectangle e = new Rectangle(1, 2);
        System.out.println("已创建一个长为1宽为2矩形");
        b=e;
    }

    public void CreateCube() {
        Cube e = new Cube(1, 2, 3);
        System.out.println("已创建一个长为1宽为2高为3的立方体");
        c = e;
    }

    public void CreateClinder() {
        Clinder e = new Clinder(2, 2);
        System.out.println("已创建一个半径为2高为2的圆柱体");
        d = e;
    }

    public void show() {
        System.out.println(a.output());
        System.out.println(b.output());
        System.out.println(c.output());
        System.out.println(d.output());
    }

    public void sum() {
        System.out.println("面积之和为:" + (a.S() + b.S() + c.BS() + d.BS()));
    }
}
package classwork7;

public class Testmanger {

    public static void main(String[] args) {
        Manger_rccc a=new Manger_rccc();
        a.menu();
    }

}