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Only the Top Panel Appearing in JFrame
In a JFrame, the BorderLayout is the default content pane. When adding components without specifying constraints, they are placed in the center section of the BorderLayout. However, only one component can occupy this area.
To resolve this issue, use BorderLayout constraints to specify the location of each panel:
<code class="java">f.add(top, BorderLayout.PAGE_START); f.add(mid); f.add(bot, BorderLayout.PAGE_END);</code>
Additional Optimizations:
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