5/6 物件導向程式設計 練習一

class CCircle{
    private String color;
    private double pi=3.14;
    private double radius;

    public CCircle(){
        System.out.println("constructor CCircle() called");
        color="Green";
        radius=1.0;
    }

    public CCircle(String str,double r){
        System.out.println("constructor CCircle(String,double)called");
        color=str;
        radius=r;
    }

    public CCircle(double m){
        System.out.println("constructor CCircle(double)called");
        color="red";
        radius=m;
    }

    public void show(){
        System.out.println("color="+color+", Radius="+radius);
        System.out.println("area="+pi*radius*radius);
    }
}

public class B01{
    public static void main(String args[]){
        CCircle cir1=new CCircle();
        cir1.show();
        System.out.println("===========================");
        CCircle cir2=new CCircle("Blue",4.0);
        cir2.show();
        System.out.println("===========================");
        CCircle cir3=new CCircle(5.0);
        cir3.show();
        System.out.println();
        System.out.println("=============");
        System.out.println("==B10207081==");
        System.out.println("=============");
        System.out.println();
    }
}