Java源代碼：
public class Test {
public static void main(String[] args) {
Point p1 = new Point(4, 5);
System.out.printf("點p坐標為（%f,%f）\n", p1.getX(), p1.getY());
p1.setX(3);
p1.setY(4);
System.out.printf("重置後點p坐標為（%f,%f）\n", p1.getX(), p1.getY());
System.out.printf("點（%f, %f）到原點的距離的平方為%f\n", p1.getX(), p1.getY(),
p1.distance());
Point p2 = new Point(1, 2);
System.out.printf("點（%f,%f）到點（%f,%f）的距離的平方為%f\n", p1.getX(),
p1.getY(), p2.getX(), p2.getY(), p1.distance(p2));
}
}
class Point {
protected double x;
protected double y;
public Point(){
}
public Point(double x, double y) {
this.x = x;
this.y = y;
}
public void setX(double x) {
this.x = x;
}
public double getX() {
return this.x;
}
public void setY(double y) {
this.y = y;
}
public double getY() {
return this.y;
}
public double distance() {
return Math.pow(x, 2) + Math.pow(y, 2);
}
public double distance(Point p) {
return Math.pow(this.x - p.x, 2) + Math.pow(this.y - p.y, 2);
}
}
運行測試：