个回答

• 千修罗

  2016-11-03 15:07:11

  已采纳

  package Shape;
  
  public abstract class Shape {
    public abstract void Girth();
    public abstract void Area();
    
    public static void main(String args[]){
  	  Shape r = new Rectangle(5,4);
  	  r.Girth();
  	  r.Area();
  	  Shape c = new Circle(5);
  	  c.Girth();
  	  c.Area();
    }
  }
  package Shape;
  
  public abstract class Shape {
    public abstract void Girth();
    public abstract void Area();
    
    public static void main(String args[]){
  	  Shape r = new Rectangle(5,4);
  	  r.Girth();
  	  r.Area();
  	  Shape c = new Circle(5);
  	  c.Girth();
  	  c.Area();
    }
  }
  package Shape;
  
  public class Circle extends Shape {
  	int radius;
  	public Circle(int radius){
  		this.radius = radius;
  	}
  
  	public void Girth() {
  		double Girth = radius * 2 * 3.14;
  		System.out.println("圆形的周长为：" + Girth);
  	}
  
  	public void Area() {
  		double Area = radius * radius * 3.14;
  		System.out.println("圆形的面积为：" + Area);
  	}
  }

  
  

  1

• TTTi

  2016-11-24 21:43:25

  
  

  class Text //测试类

  {

  public static void main(String[] args) 

  {

  Shape s1 = new Rectangle1();

  Shape s2 = new Circle();

  s1.girth(3,4);

  s1.size(5,2);

  s2.girth(6.0);

  s2.size(10.0);

  }

  }

  abstract class Shape //父类
  

  {

  public abstract void girth(int a,int b);

  public abstract void size(int a,int b);

  public abstract void girth(double r);

  public abstract void size(double r);

  }

  class Rectangle1 extends Shape//子类1
  

  {

  public void girth(int a,int b)
  

  {

  int gir;

  gir = (a + b)*2;

  System.out.println("矩形的周长为：" + gir );

  }

  public void size(int a,int b)

  {

  int si;

  si = a * b;

  System.out.println("矩形的面积为：" + si);

  }

  public void girth(double r){}

  public void size(double r){}

  }
  

  class Circle extends Shape//子类2
  

  {

  double pai = 3.1415926;

  double r;

  public void girth(double r)

  {

  double gir = pai *r;

  System.out.println("圆的周长为：" + gir);

  }

  public void size(double r)

  {

  double si;

  si = pai * (r *r)/4;

  System.out.println("圆的面积为：" + si);

  }

  public void girth(int a,int b){}

  public void size(int a,int b){}

  }
  

  
  

  0

• talent85012016

  2016-11-24 15:19:30

  public abstract class Figure {

  public abstract void perimeter(double a,double b);

  public abstract void area(double a , double b);

  }

  抽象方法是可以带参数的

  0

• TTTi

  2016-11-24 02:46:00

  我用抽象写不出来啊，一直报错 类不是抽象的，并且未覆盖抽象方法，最后只能这样写了

  public class Text //测试类

  {

  public static void main(String[] args) 

  {

  Shape s1 = new Rectangle1();

  Shape s2 = new Circle();

  s1.zhouChang(3,4);

  s1.squareMeasure(5,2);

  s2.zhouChang(6.0);

  s2.squareMeasure(10.0);

  }

  }

  
  

  class Shape   //父类

  {

  public void zhouChang(int a,int b){}

  public void squareMeasure(int a,int b){}

  public void zhouChang(double r){}

  public void squareMeasure(double r){}

  }

  
  

  class Rectangle1 extends Shape  //矩形

  {

  public void  zhouChang(int a,int b)

  {

  int zc;

  zc = (a + b)*2;

  System.out.println("矩形的周长为：" + zc );

  }

  public void squareMeasure(int a,int b)

  {

  int sm;

  sm = a * b;

  System.out.println("矩形的面积为：" + sm);

  }

  }

  
  

  class Circle extends Shape //圆形

  {

  double pai = 3.1415926;

  public void zhouChang(double r)

  {

  double zc = pai *r;

  System.out.println("圆的周长为：" + zc);

  }

  public void squareMeasure(double r)

  {

  double sm;

  sm = pai * (r *r)/4;

  System.out.println("圆的面积为：" + sm);

  }

  }

  
  

  0

• zivf

  2016-11-02 21:59:29

  package com.Shape;
  public abstract class Shape {
   public abstract void girth();
   public abstract void area();
  }
  
  package com.Shape;
  public class Rentanle extends Shape {
  
   public void girth() {
    // TODO Auto-generated method stub
       System.out.println("长方形的周长=2*（长+宽）");
   }
   
   public void area() {
    // TODO Auto-generated method stub
        System.out.println("长方形的面积=长*宽");
   }
  }
  
  package com.Shape;
  public class Circle extends Shape {
   
   public void girth() {
    // TODO Auto-generated method stub
      System.out.println("圆形的周长=π*直径");
   }
   
   public void area() {
    // TODO Auto-generated method stub
      System.out.println("圆形的面积=π*r*r");
   }
  }
  
  package com.Shape;
  public class Initial {
   public static void main(String[] args) {
    // TODO Auto-generated method stub
      Shape s1 =new Rentanle();
    
      s1.area();
      s1.girth();
       Shape s2=new Circle();
       s2.area();
       s2.girth();
     
      
        
   }
  }

  亲测可用，好像有个单词写错了，但是懒得改了。给你参考一下吧，交流一下。
  

  2