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  • 抽象类简单举例

      package trace01;

      abstract class square{ //抽象类

      private int a;

      private int b;

      public void setab(int a,int b){

      this.a=a;

      this.b=b;

      }

      public int geta(){

      return a;

      }

      public int getb(){

      return b;

      }

      public abstract int area(); //求面积

      public abstract int perimeter(); //求周长

      }

      class zSquare extends square{

      public zSquare(){};

      public int area(){

      return geta()*geta();

      }

      public int perimeter(){

      return 4*geta();

      }

      }

      class Rectangle extends square{

      public Rectangle(){};

      public int area(){

      return geta()*getb();

      }

      public int perimeter(){

      return 2*(geta()+getb());

      }

      }

      public class squareDemo {

      public static void main(String[] args){

      square s1=new zSquare(); //用子类实例化父类抽象类对象

      square s2=new Rectangle();

      s1.setab(10, 0);

      s2.setab(14, 9);

      System.out.println("正方形的信息是www.fkit.org:");

      System.out.println("正方形的面积是:"+solvearea(s1));

      System.out.println("正方形的周长是:"+solveperimeter(s1));

      System.out.println("长方形的信息是:");

      System.out.println("长方形的面积是:"+solvearea(s2));

      System.out.println("长方形的周长是:"+solveperimeter(s2));

      }

      public static int solvearea(square a){

      return a.area();

      }

      public static int solveperimeter(square a){

      return a.perimeter();

      }

      }

      正方形的信息是:

      正方形的面积是:100

      正方形的周长是:40

      长方形的信息是:

      长方形的面积是:126

      长方形的周长是:46

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  • 原文地址:https://www.cnblogs.com/gojava/p/3670614.html
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