Cricle.java - java_programming

package javaapplication1;
 
public class Circle {
    int radius;
    int x;
    int y;
 
    public Circle(){
        this.radius = 10;
        this.x = 0;
        this.y = 0;
    }
    public Circle(int r){
        this.radius = r;
        this.x = 0;
        this.y = 0;
    }
    public Circle(int x, int y, int r){
        this.radius = r;
        this.x = x;
        this.y = y;
    }
 
    void setRadius(int r){
        this.radius = r;
    }
    void setLocation(int x, int y){
        this.x = x;
        this.y = y;
    }
 
    double getArea(){
        return Math.PI * (this.radius * this.radius);
    }
 
    public String toString(){
        return "[" + this.x + ", " + this.y + ", " + this.radius + "]";
    }
 
    boolean isOver(Circle c){
        int ax = this.x - c.x;
        int ay = this.y - c.y;
 
        int length = ax * ax + ay * ay;
        int r = this.radius + c.radius;
 
        if (length <= r * r){
            return true;
        } else {
            return false;
        }
    }
 
    public static void main(String[] args){
        Circle c = new Circle();
 
        System.out.println("円cは");
        System.out.println(c.toString());
 
        Circle d = new Circle(5);
        System.out.println("円dは");
        System.out.println(d.toString());
        System.out.println("面積は" + d.getArea());
 
        Circle e = new Circle();
        e.setLocation(10, 0);
        e.setRadius(5);
 
        System.out.println("円eは");
        System.out.println(e.toString());
        System.out.println("面積は" + e.getArea());
 
 
        if (d.isOver(e)){
            System.out.println("重なっている");
        } else {
            System.out.println("重なっていない");
        }
    }
}