Java help ---A JButton array *FIXED* - Overclock.net

*dangerousHobo* · 04-05-07

Well my prof. made it sound like it was possible to make an array of JButtons instead of naming 9 different buttons.

However I'm getting a NullPoinerException at line 98 where I'm adding the buttons to the JFrame.(in bold)

Heres the code:

Code:

		
		JButton[] button =new JButton[9];
		
		
		for(int i=0;i<button.length;++i){
			this.add(button[i]);
		}

*dangerousHobo* · 04-06-07

FIXED:

Turns out I was only creating the array, but never the objects.
Simple fix:

Code:

JButton[] button = new JButton[9];

for(int i=0;i<button.length;++i){
        button[i] = new JButton();
	this.add(button[i]);
}

C-bro · 04-12-07

As you already know, you can make an array of buttons. I used it when I had to do an implementation of the basic Windows calculator. You can also make arrays of containers, panes, JTextFields and pretty well every other thing you can think of. It came in VERY handy when I did a Sudoku solver. 81 individual cells would have been a pain.

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Java help ---A JButton array FIXED

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