Null pointer exception

 

I get a null pointer exception error message and all i am trying to do is apply text to the programe with an int for the player score... However when i call upon the function of the ScoreUp class in draw, i get the error. Seems silly for such a simple thing!!!

 

Any hep appreciatted, ill just pop the code up....

 

//Main class

 

Star [] star = new Star [50];//Declare as a collection/array of stars and the size - 50.
Enemy [] enemy = new Enemy[3];//Declare classes
Planet [] planet = new Planet[6];

ArrayList bulletCollection;

Score score;
User user;

import ddf.minim.*;

Minim minim;
AudioPlayer player;
AudioSample crash;

void setup() {
  size(1000, 700, P3D);
  smooth();

  minim = new Minim(this);
  player = minim.loadFile("theme.mp3");
  //player.play();
  crash = minim.loadSample("crash.mp3");

  bulletCollection = new ArrayList();

  for (int i = 0; i < 6; i ++) {
    planet [i] = new Planet(random(0, width), random(0, height), 15, 15);
  }

  for (int i = 0; i < enemy.length; i ++) {
    enemy [i] = new Enemy(1050, random(100, 600), 50, 50);//initialize parameters in here
  }

  PImage simg = loadImage("ship.jpg");
  user = new User(75, 350, simg);

  for (int i = 0; i < 50; i ++) {
    star [i] = new Star(random (0, width), random(0, height), 5, 5);
  }
}

void draw() {

  background(0);
  noStroke();
 
  score.displayScore();

  for (int i = 0; i < bulletCollection.size() ; i ++) {
     Bullets bullets = (Bullets) bulletCollection.get(i);
     bullets.run();
 
  }

  for (int i = 0; i < 50; i ++) {
    star[i].run();//call upon all elements of the array. If i was a 0 itwould call one star
    star[i].move();
    if (star[i].x < 0) {
      star [i] = new Star( width, random(0, height), 5, 5);
    }
  }

  for (int i = 0; i < enemy.length; i ++) {
    enemy[i].run();
  }

  for (int i = 0; i < 6; i ++) {
    planet[i].display();
    planet[i].move();
    if (planet[i].x < 0) {
      planet [i] = new Planet(random(1000, 1200), random(0, height), 15, 15);
    }
  }

  user.run();
 
}

void keyPressed() {
  //println(user.playerSpeedX);
  user.move();
}

void mousePressed() {

  Bullets bullets = new Bullets(user.imgX + 172, user.imgY + 42, 5, 2);
  bulletCollection.add(bullets);
}

void stop()
{
  // always close Minim audio classes when you are done with them
  player.close();
  crash.close();
  minim.stop();

  super.stop();
}

//Bullet Class

 

class Bullets {

  float x, y, w, h;
  float bulletSpeed = 8;
  boolean hit = false;
  boolean active = true;
  int playerScore = 0;

  Bullets(float posX, float posY, float Width, float Height) {

    x = posX;
    y = posY;
    w = Width;
    h = Height;
  }

  void run() {
    display();
    moveBullet();
    collision();
   
  }

  void display() {
    fill (255, 255, 44);
    rect(x, y, w, h);
  }

  void moveBullet() {
    x += bulletSpeed;
    if (x >= width) {
      active = false;
    }
  }

  void collision() {
    for (int i = 0; i < bulletCollection.size();i++) {
      Bullets bullets = (Bullets) bulletCollection.get(i);
      for (int j = 0; j < enemy.length ; j ++) {
        if (x+w >= enemy[j].x && x <= enemy[j].x + enemy[j].w
          && y+h >= enemy[j].y && y <= enemy[j].y + enemy[j].h && active != false) {
          enemy[j].x = width;
          hit = true;
          bulletCollection. remove(i);
          println(playerScore);
        }
        else {
          hit = false;
        }
      }
    }
  }
}

 

//Enemy Class

 

class Enemy {

  float x, y, w, h;
  float Xspeed = -7;
  float Yspeed = -5;
  float YspeedC = 2;
  boolean collide = false;
  float collideFall = 8;
  float fillCol = 0;

  Enemy (float posX, float posY, float Width, float Height) {
    x = posX;
    y = posY;
    w = Width;
    h = Height;
  }

  void run() {
    show();
    move();
    changeover();
    collide();
    boom();
    reset();
  }

  void show() {
    fill(255, 255, fillCol);
    rect(x, y, w, h);
  }

  void move() {
    x += Xspeed;
    y += Yspeed;
  }

  void changeover() {
    if (y <= 100|| y >= 600) {
      Yspeed = Yspeed *-1;
    }
  }

  void collide() {
    if (x >= user.imgX && x <= user.imgX + 172
      && y >= user.imgY && y <= user.imgY + 90) {
      Xspeed = 0;
      Yspeed = 0;
      collide = true;
    }
  }

  void boom() {
    if ((collide)) {
      user.imgY += collideFall;
      //crash.trigger();
    }
    else {
      collide = false;
    }
  }

  void reset() {
    if (x <= 0) {
      x = width;
      y = random(0,700);
    }
  }
}

 

//planet class

 

class Planet{
 
  float x,y,w,h;
  float planetSpeed = 5;
 
  Planet(float PosX, float PosY, float Width, float Height){
    x = PosX;
    y = PosY;
    w = Width;
    h = Height;
   
  }
 
  void display(){
    fill(random(0,255),random(0,255), random(0,255));
    ellipse(x,y,w,h);
    noStroke();
  }
 
  void move(){
    x -= planetSpeed;
  }
}
 
//Score class

 

class Score {
 
  int playerScore = 0;

  void displayScore() {
    fill(255);
    textSize(30);
    text (playerScore, 50, 50);
  }
}

//Star Class 

 

class Star {
  float x, y, w, h;
  float starSpeed = 7;
  Star( float posx, float posy, float posw, float posh ) {
    x = posx;
    y = posy;
    w = posw;
    h = posh;
  }
 
  void run(){
    display();
  }
 
  void display(){
    fill(255);
    ellipse(x,y,w,h);
    strokeWeight(2);
  }
 
  void move(){
    x -= starSpeed;
   
  }
}

 

//User Class

 

class User {

  float x, y, w, h;
  float playerSpeedY = 15;
  float playerSpeedX = 15;
  PImage img;
  float imgX = 75;
  float imgY = 350;

  User (float posX, float posY, PImage img) {
    this.x = posX;
    this.y = posY;
    this.img = img;
  }

  void run() {
    display();
    bulletTracker();
  }

  void display() {

    image(img, imgX, imgY);
  }

  void bulletTracker() {
    fill(255, 255, 0);
    ellipse(imgX + 172, imgY + 45, 10, 10);
  }

  void move() {
    if (keyCode == UP) {
      imgY -= playerSpeedY;
    }
    else if (keyCode == DOWN) {
      imgY += playerSpeedY;
    }
    else if (keyCode == LEFT) {
      imgX -= playerSpeedX;
    }
    else if (keyCode == RIGHT) {
      imgX += playerSpeedX;
    }
  }
}

Many thanks!