package Demo;

public class Point {
    private double x, y, z;
    public Point(double _x, double _y, double _z) {
        x = _x;
        y = _y;
        z = _z;
    }
    public void setX(double _x) {
        x = _x;
    }
    public double getPointDistance(Point p) {
        return (p.x - x)*(p.x - x) + (p.y - y)*(p.y - y) + (p.z - z)*(p.z - z);
    }
    
 
public static void main(String[] args) {
        Point p = new Point(1.0, 2.0, 3.0);
        Point p1 = new Point(0.0, 0.0, 0.0);
        System.out.println(p.getPointDistance(p1));
        
        p.setX(3.0);
        System.out.println(p.getPointDistance(new Point(1.0,1.0,1.0)));
    }
}

內存分析圖：

java 內存分析之二