Hi how am I doing this wrong. I how to properly order this

public class Vector2D {

private double xComp;

private double yComp;

public Vector2D(){

xComp = 0;

yComp = 0;

}

public Vector2D(double xComp, double yComp) {

super();

this.xComp = xComp;

this.yComp = yComp;

}

public Vector2D(Vector2D v){

this.xComp = v.xComp;

this.yComp = v.yComp;

}

public double getX() {

return xComp;

}

public double getY() {

return yComp;

}

public void setVector2D(double xComp, double yComp) {

this.xComp = xComp;

this.yComp = yComp;

}

public double norm(){

return Math.sqrt(xComp*xComp + yComp*yComp);

}

public Vector2D unit(){

if(xComp == 0 || yComp == 0)

throw new IllegalArgumentException("Zero Vector can not have Unit Vector");

else{

xComp = xComp/this.norm();

yComp = yComp/this.norm();

return this;

}

}

public Vector2D add(Vector2D v){

Vector2D temp = new Vector2D();

temp.xComp = this.xComp + v.xComp;

temp.yComp = this.yComp + v.yComp;

return temp;

}

public Vector2D sub(Vector2D v){

Vector2D temp = new Vector2D();

temp.xComp = this.xComp - v.xComp;

temp.yComp = this.yComp - v.yComp;

return temp;

}

public double dot(Vector2D v){

return this.xComp*v.xComp + this.yComp*v.yComp;

}

public Vector2D sMult(double scalar){

this.xComp = this.xComp*scalar;

this.yComp = this.yComp*scalar;

return this;

}

public boolean equals(Vector2D v){

if(this.xComp == v.xComp && this.yComp == v.yComp)

return true;

else

return false;

}

@Override

public String toString() {

return "";

}

}

Vector2D demo

package first;

import java.util.Scanner;

public class Vector2DDemo {

public static void main(String[] args) {

Scanner scan = new Scanner(System.in);

System.out.println("Enter x and y components of the first vector->");

double x1 = scan.nextDouble();

double y1 = scan.nextDouble();

Vector2D v1 = new Vector2D(x1, y1);

System.out.println("Enter x and y components of the second vector->");

double x2 = scan.nextDouble();

double y2 = scan.nextDouble();

Vector2D v2 = new Vector2D(x2, y2);

System.out.println("Enter x and y components of the third vector->");

double x3 = scan.nextDouble();

double y3 = scan.nextDouble();

Vector2D v3 = new Vector2D(x3, y3);

System.out.println();

System.out.println(v1.toString());

System.out.println(v2.toString());

System.out.println(v3.toString());

System.out.println();

System.out.print("(v1 + v2) - (v1 -v3) = ");

Vector2D v4 = v1.add(v2).sub((v1.sub(v3)));

System.out.println(v4.toString());

System.out.print("||(v1 + v2) - (v1 -v3)|| = ");

v4 = v4.unit();

System.out.println(v4.toString());

System.out.println();

System.out.print("unit(v1) x sqrt(v1.v1) = ");

double squareRoot = Math.sqrt(v1.dot(v1));

System.out.println(v1.unit().sMult(squareRoot).toString());

v4 = v2.sub(v3);

v4 = v4.unit();

System.out.print("The x-component of (v2 - v3) / ||v2 - v3|| = ");

System.out.println(v4.getX());

System.out.print("The y-component of (v2 - v3) / ||v2 - v3|| = ");

System.out.println(v4.getY());

System.out.println();

//Swap x and y compnents of v3

double tempX = v3.getX();

double tempY = v3.getY();

double temp = tempX;

tempX = tempY;

tempY = temp;

v3.setVector2D(tempX, tempY);

System.out.println("v3 = " + v3.toString());

v4 = new Vector2D(v3); //create v4 from v3

System.out.println("v4 = " + v4.toString());

System.out.print("Is unit(4 x v4) equal to unit(v4)? ");

Vector2D tempVector = new Vector2D(v4);

tempVector = tempVector.sMult(4).unit();

System.out.println(tempVector.equals(v4.unit()));

System.out.println();

System.out.print("Are ||v2 - v3|| and ||v2 + v3|| equal? ");

System.out.println(v2.sub(v3).norm() == v2.add(v3).norm());

}

}

To get this, these are what has come closest to working for me

hang LILS TIcense header, choose License Headers in Project " To change this template file, choose Tools | Templates 4and open the template in the editor. 6 package vector2d: 9 10 121import java . util . Scanner; 13 14 public class Vector2DDemo ( 15 16public class Vector2D { 17 1private double xComp 19 20 private double yComp: 1 211 public Vector2DO 23 24 Comp -0 261 27 28 29 public Vector2D (double xComp, double yComp) super O this.xComp-xComp: this yComp-yComp 31 32 public Vector2D (Vector2D v) this.xComp- v.xComp 34 36 371 39 publio double getxo return xCompi public double getY)