Question

Okay, so

• new Zombie variable created.

  private Zombie zombieA;

• zombie variable initialized

  zombieA = new Zombie(1);

• calls constructor in Zombie class:

  public Zombie(int type) {
  this.type = type;
  x=200;
  y=100;
  dx=1;
  paintA.setColor(Color.RED);}
  

Basically, I want the game class to create a new Zombie, with the type as 1 which will go through a switch and case to determine which type of zombie to create (level 1=10). The problem is when I run it my application force closes and i get the an error on:

zombieA = new Zombie(1);

from the initial class and an error on:

public Zombie(int type) {

from the Zombie class. I’ve been going over it again and again and i just can’t see the problem, anyone notice anything wrong?

Answer 1

It’s hard to tell without the stack trace, but I suspect that the problem is in this line:

paintA.setColor(Color.RED);

Are you sure that paintA has been properly initialized? it seems to me that it’s null and causing a NullPointerException in your constructor. If that’s the case, be sure to instantiate it first, something like this:

paintA = new ...