A SIMPLE int[ ] array is driving me nuts!

Question

ok, what am I doing wrong? I've read many other posts saying the same thing: arrays giving null pointer exceptions, but I can't find an intelligible answer:
* Demonstrates simple arrays
public class DemonstrateSimpleArrays
    private int[] anIntArray;
    private int[] anotherIntArray;
    public DemonstrateSimpleArrays()
        int[] anIntArray = {1,2,3};
        System.out.println(anIntArray[0] + "" + anIntArray[1] + anIntArray[2]);
        int[] anotherIntArray = new int[3];
        anotherIntArray[0] = 4;
        anotherIntArray[1] = 5;
        anotherIntArray[2] = 6;
        System.out.println(anotherIntArray[0] + "" +
          anotherIntArray[1] + anotherIntArray[2]);
    public void printArrayValues()
        System.out.println(anotherIntArray[0] + "" +    //  Null Pointer Exception occurs here.
          anotherIntArray[1] + anotherIntArray[2]);
        System.out.println(anIntArray[0] + "" + anIntArray[1] + anIntArray[2]);  //  Null Pointer Exception occurs here.
}Thanks!

Answer 1

my apologies: the code in my second emssage was incorrect. it did not include the second printArrayVariables method that I just added. see ammended:
* Demonstrates simple arrays
public class DemonstrateSimpleArrays
    private int[] anIntArray;
    private int[] anotherIntArray;
    public DemonstrateSimpleArrays()
        int[] anIntArray = {1,2,3};
        System.out.println(anIntArray[0] + "" + anIntArray[1] + anIntArray[2]);
        int[] anotherIntArray = new int[3];
        anotherIntArray[0] = 4;
        anotherIntArray[1] = 5;
        anotherIntArray[2] = 6;
        System.out.println(anotherIntArray[0] + "" +
          anotherIntArray[1] + anotherIntArray[2]);
        printArrayValues(anotherIntArray, anIntArray);
    public void printArrayValues()
        System.out.println("Print Array Values:");
        System.out.println(anotherIntArray[0] + "" +   //Still Throws exception when this method is called.
          anotherIntArray[1] + anotherIntArray[2]);
        System.out.println(anIntArray[0] + "" + anIntArray[1] + anIntArray[2]);
    public void printArrayValues(int[] anotherIntArray, int[] anIntArray)
        System.out.println("Print Array Values:");
        System.out.println(anotherIntArray[0] + "" +   //Does not Throw exception (thank goodness!)
          anotherIntArray[1] + anotherIntArray[2]);
        System.out.println(anIntArray[0] + "" + anIntArray[1] + anIntArray[2]);
}