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I'm not an expert on Applets, but I believe they are AWT based, not Swing, which is a different package. You imported the AWT package, but not the Swing package, so it's probably going to complain about the JButton (which, by the way, you misspelled - Java is case-sensitive), which is from Swing, not AWT.
You can usually tell what's part of Swing because it usually starts with a 'J', such as JLabel or JButton.
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