请参阅：

如何用Java隐藏面板 [ ^ ]

我该如何隐藏当前的JPanel并用Java中的按钮显示一个新的 [ ^ ]

如何在另一个JPanel上显示JPanel然后隐藏它 [ ^ ]

See:
How to hide a panel in Java[^]
How do I hide the current JPanel and show a new one with a button in Java[^]
How to show JPanel over another JPanel and then hide it[^]