Greenfoot

K_wow

2014/8/29

#

I'm trying to obtain a boolean in an array from the world, then convert it to a string, like this:

    private String getValue()
    {
        if (intOrBool == 0)
        {
            return "" + board.intSettings[intArrayValue];
        }
        else if (intOrBool == 1)
        {
            return "" + board.boolSettings[boolArrayValue];
        }
        else
        {
            return "";
        }
    }

Here's the world code:

    public boolean[] boolSettings = {
        true //attack effects
    };

However I get a NullPointerException when attempting to run this code, and it points me to this line:

return "" + board.boolSettings[boolArrayValue];

Does anyone know what I'm doing wrong? Would you like me to post more code?

danpost

2014/8/29

#

How is 'board' declared and set in the class?

K_wow

2014/8/29

#

Like this:

    private Board board;
    
    public void AddedToWorld(World world)
    {
        board = (Board)world;
        if (intOrBool == 0)
        {
            name = board.intSettingNames[intArrayValue];
        }
        else if (intOrBool == 1)
        {
            name = board.boolSettingNames[boolArrayValue];
        }
    }

danpost

2014/8/29

#

It may be that the 'getValue' method is being called before the actor is placed in the world. Try putting the following as the first line (inserted at line 3 in the 'getValue' method):

if (getWorld() == null) return "";

K_wow

2014/8/30

#

Nope, that didn't work. Ok... It turns out I spelt addedToWorld with a capital A...

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NullPointer exception!