[소스] clone()

[주인장]

public class Point {

    private int x;

    private int y;

    Point(int x, int y){

        this.x = x;

        this.y = y;

    }

    public String toString(){

        return "x = " + x + "," + "y = " + y;

    }

}

import java.util.Objects;

public class Circle implements Cloneable{

    private Point point;

    private int radius;

    Circle(int x, int y, int radius){

        this.radius = radius;

        point = new Point(x, y);

    }

    public String toString(){

        return "원점은 " + point + "이고," + "반지름은 " + radius + "입니다.";

    }

    @Override

    protected Object clone() throws CloneNotSupportedException {

        return super.clone();

    }

    @Override

    public boolean equals(Object o) {

        if (o == null || getClass() != o.getClass()) return false;

        Circle circle = (Circle) o;

        return radius == circle.radius && Objects.equals(point, circle.point);

    }

    @Override

    public int hashCode() {

        return Objects.hash(point, radius);

    }

}

public class ObjectCloneTest {

    public static void main(String[] args) throws CloneNotSupportedException {

        Circle circle = new Circle(10, 20, 30);

        Circle copyCircle = (Circle) circle.clone();

        System.out.println(circle);

        System.out.println(copyCircle);

        System.out.println(circle.hashCode());

        System.out.println(copyCircle.hashCode());

        System.out.println(System.identityHashCode(circle));

        System.out.println(System.identityHashCode(copyCircle));

    }

}