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Where did you initialize the JLabel? It seems like you might be missing the following.


JLabel image = new JLabel();
// And then then set the imageicon
image.setIcon(new...

To maximize a JFrame you need the following code.

myFrame.setExtendedState(JFrame.MAXIMIZED_BOTH);
And to put an image in a JPanel you would create a JLabel and set the ImageIcon for that JLabel....

Change String numberString; to String numberString = 200;

If you want to check whether something is selected in the combobox you can use:


if(combobox1.getSelectedIndex() == -1) {
// Nothing has been selected in the combo box
}

Your program is most likely stuck in an infinite loop. If you post the source code I we'll be able to point out the problem.

Basic OR logic:
x y x&y
--------------
1 0 | 0
1 1 | 1
0 1 | 0
0 0 | 0

In binary the numbers are represented as follow:
4: 100

Add the following line of code after setSize(600,600).


setJMenuBar(mb);

Those are used to represent boolean operators. The && is used for AND statements and the || for OR statements.

The expression "A || B" will return true if either A or B where "A && B" will only...

Oracle has a Visual Guide to Layout Managers that you might find useful for choosing which layout manager to use.

Another approach to consider is to create a JTabbedPane and align all the tabs on...