圖片

class ChongZai{

public double area(double radius){

return (Math.PI*radius*radius);

}

public double area(double length,double width){

return (length*width);

}

public double area(double length,double width,double height){

return ( length*width*height);

}

}

public class A{

public static void main(String args[]){

ChongZai t=new ChongZai();

System.out.println("圓的半徑為5，面積是："+t.area(5));

System.out.println("矩形長為6，寬為21，面積是："+t.area(6,21));

System.out.println("立方體長寬高分別為4，5，6，面積是："+t.area(4,5,6));

}

}