package com.imooc;

public abstract class Shape {

public abstract void hello (String girth,String area);

}

-------------------------------------------------

package com.imooc;

public class Rectangle extends Shape {

@Override

public void hello(String girth,String area) {

// TODO Auto-generated method stub

System.out.println("矩形的周長是："+girth+"，面積是："+area);

}

}

--------------------------------------------------------

package com.imooc;

public class Circle extends Shape {

@Override

public void hello(String girth, String area) {

// TODO Auto-generated method stub

System.out.println("圓形的周長是："+girth+"，面積是："+area);

}

}

------------------------------------------------------------

package com.imooc;

public class Text {

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

Shape rec=new Rectangle();

rec.hello("2(a+b)", "a*b");//a為矩形的長，b為矩形的寬。

Shape cir=new Circle();

cir.hello("2Math.PIr","Math.PIr2" );

}

}

-----------------------------------------------------

矩形的周長是：2(a+b)，面積是：a*b

圓形的周長是：2Math.PIr，面積是：Math.PIr2