A common mistake when using BorderLayout is to add a Component to a content pane or frame without naming a region, resulting in some of the components not being visible.

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Quizplus · Accepted Answer

This is a common mistake when using BorderLayout. If a component is added without specifying a region, it will be added to the center region by default, potentially covering up any other components that were added to other regions.

A Common Mistake When Using BorderLayout Is to Add a Component