Null pointer exception

You have tried to access an object that has had it's pointer declared, but hasn't yet been created.

public class TestException
{

static String bob;

  public static void main(String[] args)
  {
   bib(); if access was here, there would be a not initialised error
  }

  private static void bib()
  {
   if(bob.equals("pie")) bob doesn't have a String yet - gives null pointer exception
   System.out.println("Bob is pie!");
  }


}