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Thread: JPanel-type class doesn't apear on the JFrame?

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    Default JPanel-type class doesn't apear on the JFrame?

    I created a class named Surface the inherites from JPanel. This class draws a General Path inside it's paintComponent(). I tried adding it to a JFrame and it doesn't get displayed.

    Then I was advised to give the Surface instance a preferredSize, and it now displays correctly.

    My question is: Is the default for JPanel-type objects that only have a GeneralPath in their paintComponent() (no rectangles and other shapes), to be invisible until you explicitly set their preferred size?

    Thanks


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    Default Re: JPanel-type class doesn't apear on the JFrame?

    No.

    Please show the code that wasn't working correctly so that we can determine the reason.

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    Default Re: JPanel-type class doesn't apear on the JFrame?

    Quote Originally Posted by AvivC View Post
    My question is: Is the default for JPanel-type objects that only have a GeneralPath in their paintComponent() (no rectangles and other shapes), to be invisible until you explicitly set their preferred size?
    Not exactly. The size (and location) of a component depends on the container in which you add the component:
    a) if the container uses a layout manager or not.
    and
    b) if there is a layout manager, in which area (depending on the specific layout manager).

    For example, if a container has a BorderLayout and you put a component in the CENTER area, then any set of the preferred size is totally ignored.
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    Default Re: JPanel-type class doesn't apear on the JFrame?

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