Question

Here is the thing- my Main method only calls InitGui. Inside the whole class (basically the whole file, i have the InitGui method and a few public static gui objects. One of the objects is actuall an array

public static JButton Keys[] = null; 

And I have a method called placeKeys that gets the location for each JButton “Keys” and places it on the panel. The whole code works when I do not use this method, basically instead of for i=0 to whatever, I want just call placeKey(arguments here…) instead of
for each jButton to be placed like this

for i=0 to whatever
Keys[i] = new JButton(jBStringArray[i]);
        Keys[i].setLocation(2 + i*kSize,2+row*50);
        Keys[i].setSize(50, kSize);     
        keyboardPane.add(Keys[i]);            

I have the method written down but it reports a pointer error at the placeKeys when it tries to access the Keys[] , meaning the first line of the method

Hope you understood me

Answer 1

Before your for loop (either when you declare it, or, if you rely on the null check, just before the for loop) you need to create the array with Keys = new JButton[whatever+1];. Oh and please start your variable names with a lowercase letter – it’s the universally-accepted thing to do.