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Thank you for your reply. I think I found the problem. I forgot to set the preferred size of the west panel. Thank for your guidance.

I still don't understand what you said about the west panel.

Thank you for your reply. I tried to change the layout of west panel to flow layout before. However, the components are arranged horizontally. The second question is when I set the preferred sizes of...

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I am working on some basic questions about GUI. The above picture is the required interface. However, part of my work is not ideal.

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This is my work. I use a border layout to contain...

In fact, I send the code to the system and it will be tested. However, my code cannot pass the test of the system. It said my code cannot give the appropriate result.

I am dealing with POJ 1002 which is a question of online judge from PKU. I test my program and all the cases pass. However, wrong answer is given by the system. I don't know what's wrong with my...