public double len(){
double length;
length = Math.sqrt(this.x * this.y);
return length;
public void nor(){
this.x = this.x / length;
this.y = this.y / length;
System.out.println;
public void pri(){
System.out.println;
public class CheckVector2{
public static void main(String args[]){
Vector2 v2 = new Vector2(1,1);
v2.set(3,4);
v2.add(2, 3);
//v2.pri();
v2.sub(2, 3);
v2.mul(2);
System.out.println;
v2.nor();