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Have a look at this post, maybe it will help you :) [Click Here](http://stackoverflow.com/questions/10019838/for-loop-with-multiplication-step-in-matlab)
The java.lang.AbstractMethodError is thrown because a Class that is required to run it hasn't run or didn't get any info. So you should look at the classes that this Abstract method/class uses.
Try while(Card c: col) { return c; } or for(int i = 0; i < col.length(); i++) { return c; } **These may work or may not, I only started learning java for 2-3 months now. Forgive me if these don't work :3
This might be useful for you, read the answer -> [Click Here](http://stackoverflow.com/questions/2423197/how-do-i-make-my-frames-change-in-java)
I've found a usefull explanation of a 2D array for you. [Click Here](http://stackoverflow.com/questions/12231453/creating-two-dimensional-array) Look at the answer. For you to implement in the code above, I think that you need to make the "int random = 0" to a multi dimensional. Like 'int[][] random = new int[X][]' X = Rows, …
You should first create the textfield by declaring them obviously. ( JTextField fieldinput, fieldoutput; ) No idea how many fields you want. Also what -stultuske' mentioned, you can use the setText method like: fieldinput.getText(fieldinput) and fieldoutput.setText(fieldinput). You need buttons to make them operate. You have to use the ActionListener for …
Can you please repost this, and place an "description" above each file source what it is used for? I would love to help you, but atleast show some effort.
The End.