4-4编程

package com.imooc.shape;

abstract public class Shape{

    abstract double area();

}

==========================================

package com.imooc.shape;

//子类圆Circle类

public class Cricle extends Shape {

  //属性：圆的半径r

  public double r;

  //创建带参构造方法以及无参构造方法

  public Cricle(){

  }

  public Cricle(double r){

      this.setR(r);

  }

  //创建针对半径的赋值和取值方法

  public void setR(double r){

      this.r=r;

  }

  public double getR(){

      return r;

  }

//重写父类中area()方法

public double area(){

   return (double)(3.14*r*r);

}

}

============================================

package com.imooc.shape;

public class Rectangle extends Shape {

    //属性：矩形的长lenghth、宽wide

    public double lenghth;

    public double wide;

//创建带参构造方法以及无参构造方法

public Rectangle(){

}

public Rectangle(double lenghth,double wide){

   this.lenghth=lenghth;

   this.wide=wide;

}

    //创建针对长、宽的赋值和取值方法

    public void setLenghth(double lenghth){

        this.lenghth=lenghth;

    }

    public double getLenghth(){

        return lenghth;

    }

    public void setWide(double wide){

        this.wide=wide;

    }

    public double getWide(){

        return wide;

    }

//重写父类的area（）方法

public double area(){

   return (double)(lenghth*wide);

}

}

=======================================================

package com.imooc.test;

import com.imooc.shape.Cricle;

import com.imooc.shape.Rectangle;

import com.imooc.shape.Shape;

public abstract class Test {

public static void main(String[] args) {

//创建类的实例，并分别对圆的半径和矩形的长宽进行赋值

   Cricle one=new Cricle(5);

   Rectangle two=new Rectangle(15,2);

//调用area（）方法，输出结果

System.out.println("圆的面积为："+one.area());

System.out.println("矩形面积为："+two.area());

}

}

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大神帮忙看下我这个程序再eclipse 上运行没问题的  但是再作业上就出问题 ，请指导下谢谢