Panel components disappear when I minimize frame

Question

I have a layout with a main panel whose content is decided by me throught buttons in this way:

public void actionPerformed(ActionEvent e) {
    mainPanel.removeAll(); //removing all current panel components
    if(e.getActionCommand().equals("content1")){
        mainPanel = new Content1Panel();
        add(mainPanel,BorderLayout.CENTER);
        validate();
    }else if(e.getActionCommand().equals("content2")){
        mainPanel = new Content2Panel();
        add(mainPanel,BorderLayout.CENTER);
        validate();
            }
}

now, if I minimize the frame and then bring it to front I find all main panel's components disappeared! Anyway, when I hover on them with the mouse components show again. What is wrong?

1) For better help sooner, post an [SSCCE](http://sscce.org/). 2) Please use a consistent and logical indent for code blocks. — Andrew Thompson, Aug 22 '12 at 10:18
`removeAll();` Use a [`CardLayout`](http://docs.oracle.com/javase/7/docs/api/java/awt/CardLayout.html) instead. — Andrew Thompson, Aug 22 '12 at 10:19
See also [this question](http://stackoverflow.com/q/12042039/1076463) where `removeAll` removed a bit too much — Robin, Aug 22 '12 at 10:31

score 4 · Accepted Answer · edited May 23 '17 at 11:52

4

for JFrame / JDialog / JWindow

to use

validate(); (revalidate in Java7 )
repaint();

example about standard rulles
use CardLayout instead of remove and then add the JPanel to the container

edited May 23 '17 at 11:52

Community

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answered Aug 22 '12 at 10:21

mKorbel

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Panel components disappear when I minimize frame

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