NullPointerException when there is data in array

[anoorally]

I have an array which has 6 items in it. When I print the array size, it displays 6. But when I try to access the item at index 1, it gives me the NullPointerException error:

Tile[] tiles = (Tile[])input;
print("tile array length: "+ tiles.length);
print("tile-->"+tiles[0].getTileNum());
print("tile-->"+tiles[1].getTileNum());

Here is the output:
tile array length: 6
tile-->45
java.lang.NullPointerException

It traces back to the line:

print("tile-->"+tiles[1].getTileNum());

Any idea whats going wrong?

[Fubarable]

The length of an array just returns how many items the array can hold, nothing more. It tells you nothing about whether the elements in the array are filled or not. Think of it as if it were a parking lot. The length tells you how many parking spots are present in the lot, but tells you nothing about how many have cars parked in them yet.

Your problem is that you're trying to call a method on a null variable -- on an array element that does not yet refer to an object.

[anoorally]

Thank you, i got to my error :)

[tnrh1]

According to furable post, the default value on an object is a null so you have to initialize the array elemnts if you want to have an objects in it.
Something like ar[k] = new Tile(), but to every element of the array.