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validate, revalidate methods

 
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What is the difference between validate(), invalidate() and revalidate() methods, and when to use them.
Also i am getting able to understand difference between paint() and repaint().
When to use the updateUI() method.

Please explain it with some example.

Thanks in advance.
 
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> Please explain it with some example.

if you have a problem, by all means post the specific problem.
if you just want general info, try google.
 
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