Dynamically Add or Remove Panel in Frame

Dear all,
I have three panels in my frame. Panel1 and Panel2 always be in Frame. The Panel3 to be displayed according to button click in Panel2. If the button in Panel2 is clicked then the Panel3 and it's components to be displayed in the frame otherwise the Panel3 and and it's components should not be displayed.
Anyone please help me that how to perform this is in Swing..
Thanks in advance.
Sathish kumar D

mainPanel.add(panel3);
mainPanel.revalidate();

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import java.awt.event.*;
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