JFrame Components To Update Help (Java)

Alright. So I have a JFrame, and it has a JLabel. I call the JFrame, and it displays properly (with 开发者_Go百科the label). So now I want to call an updater to "update" the JFrame to add more buttons and crap. How can I do this WITHOUT having to open up a new JFrame?

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You need to call JFrame.invalidate() first, then call JFrame.validate().

public void invalidate()

Invalidates the container. The container and all parents above it are marked as needing to be laid out.