( im new to java) How do I increase number of columns in a JTable ?

I am dooing a small calculating program in school and can't figure out how to change the amount of columns in a JTable, my programming skills sofar are extremely basic and therefore we are using the netbeans GUI to create our windows. The code generated by the GUI cannot be edited and I have tried to copy paste the code into Eclipse but it didn't work.
I have a fair idea of where in the code you can preform the things I want but I need to do it in the grapical interface.
any suggestions are very much appriciated.

my programming skills sofar are extremely basic and therefore we are using the netbeans GUI to create our windows.Using and IDE doesn't not make it easier. As you've found out it only makes it harder since you can't edit the code and take full control.
Read the Swing tutorial, it contains plenty of example for building GUI applications:
http://java.sun.com/docs/books/tutorial/uiswing/TOC.html
I don't really understand your question, because if you create the table correctly, then then is no need to increase the number of columns. However, the table does support an addColumn(....) method.

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( im new to java) How do I increase number of columns in a JTable ?

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