How to add new component to JFrame dynamically?

Hello,I'm now study the GUI and here i meet a problem.I want to display a pic use JComponent.In paint() method i paint the pic.because i use a button to open a FileDialog to choose a pic file and send the path info to the constructor of JPicPane(i extends it from JComponent),so it will be add to the frame when it was visible and we know that there is a swing thread problem.so i use invokeLater(new Runnable(){....pack();});I want to know besides pack() can i use other method to change the layout sothat the new component could be displayed.becasue pack() will make the frame changeits size.(it displays the preferred size of components?) I don't want it make the frame change size and the component be displayed,is there any approch else?one method occur to me is chang the prefer size of contentPane sothat the pack won't make the frame small.is there any other method?and by the way,what's the different between invokeLater and invokeAndWait?
thank you all! thank you!

No idea why it is slow(er). The difference between invokeLater and InvokeAndWait are described here and in the tutorial that is linked there.

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  • How to add New field in SMART forms.

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    Moderator message: Welcome to SCN!
    Moderator message: please search for available information/documentation, do not use a priority higher than normal (no "soon", "ASAP", "earliest" etc.).
    [Rules of engagement|http://wiki.sdn.sap.com/wiki/display/HOME/RulesofEngagement]
    [Asking Good Questions in the Forums to get Good Answers|/people/rob.burbank/blog/2010/05/12/asking-good-questions-in-the-forums-to-get-good-answers]
    Edited by: Thomas Zloch on Jun 17, 2011 12:31 PM

    How to add new field in the SMART FORMS. Please know me the step.
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    Moderator message: Welcome to SCN!
    Moderator message: please search for available information/documentation, do not use a priority higher than normal (no "soon", "ASAP", "earliest" etc.).
    [Rules of engagement|http://wiki.sdn.sap.com/wiki/display/HOME/RulesofEngagement]
    [Asking Good Questions in the Forums to get Good Answers|/people/rob.burbank/blog/2010/05/12/asking-good-questions-in-the-forums-to-get-good-answers]
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