I have created a JFrame that contains 3 JPanel.
My problem is, when i clicked in the bouton to expand the Frame,the 3 JPanel are fixed and do not expanded with the Jframe.
Would you tell me how can i solve this problem and thanks
The short answer is you should use layout managers which allow that to happen (which is almost all layout managers). The long answer depends on the actual code you wrote to combine those JPanels into the JFrame -- so posting an SSCCE would be helpful.