Why does the first panel added to a frame disappear?

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  • The default layout of a JFrame (or more specifically in this case, the content pane of the frame) is a BorderLayout.
  • When adding a component to a BordeLayout with no constraint, the Swing API will put the component in the CENTER.
  • A BorderLayout can contain exactly one component in each of the 5 layout constraints.
  • When a second component is added to the same (in this case CENTER) constraint of a BorderLayout, this implementation of Java will display the last component added.

As to what would be a better approach depends on the specific needs of the user interface.

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