抽象类的运用

package 抽象类运用;

abstract class MyShape{
 String name;
 public  MyShape(String name) {
  this.name = name;
 }
 public abstract void getArea();
 public abstract void getlength();
}
class Circla extends MyShape{
 double r;
 public static final double pi = 3.14;
 public  Circla(String name,double r) {
  super(name);
  this.r=r;
 }
 public  void getArea() {
  System.out.println(name+"面积为:"+pi*r*r);
 }
 public void getlength() {
  System.out.println(name+"周长为:"+2*pi*r);
 }
}
class  Rect extends MyShape{
    int width;
    int higth;
    public Rect(String name,int width,int higth) {
     super(name);
     this.width = width;
     this.higth = higth;
    }
    public void  getArea() {
     System.out.println(name+"的面积为:"+width*higth);
    }
    public void getlength() {
     System.out.println(name+"的周长为:"+2*width+2*higth);
    }
}

public class Dome {
     public static void main(String [] args) {
      Circla c1 = new Circla("圆",4);
      System.out.println("图形的名字叫做:"+c1.name);
      c1.getArea();
      c1.getlength();
      Rect r1 = new Rect("矩形",2,3);
      System.out.println("图形的名字叫做:"+r1.name);
      r1.getArea();
      r1.getlength();
     }
}