I`ve tried to put the same Image into an array (array contains 22 Images) to form inventory.

for(int i=0;i>22;i++){
        invSprite[i] = new Sprite(ingame);
        invSprite[i].defineReferencePixel(0,0);

    }

and

if(inventory){

        for(int i=0;i>22;i++){

            if(i>=11){
                invSprite[i].setRefPixelPosition(0+15*i, 27);
            }else{
                invSprite[i].setRefPixelPosition(0+15*i, 42);
            }
                             invSprite[i].paint(g);
        }
    }

If the inventory is on it will show those Images but it`s not.

PS if I would try

invSprite[0].setRefPixelPosition(10, 27);
invSprite[0].paint(g);

it would throw an java/lang/NullPointerException