//Area_01.java

public class Area_01{

    //面積を求めます

    public double circle(double redius){
        System.out.print("TypeA ");
        return redius * 2 * Math.PI;
    }
    public double circle(double redius, double pi){
        System.out.print("TypeB ");
        return redius * 2 * pi;
    }

    public static void main(String[] args){
        Area_01 area_01 = new Area_01();
        double area;
        area = area_01.circle(4); //引数：(double)
        System.out.println("面積＝ " + area);

        area = area_01.circle(4, 3.14); //引数：(double,double)
        System.out.println("面積＝ " + area);

    }
}