Why I can not compile it:

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Question: Why I can not compile it:

byte aa = 2;
aa = - - aa;
I think the construction: - -aa is equivalent to -(-aa)...

Answer: The Java programming language supports various arithmetic operators for all floating-point and integer numbers. These operators are + (addition), - (subtraction), * (multiplication), / (division), and % (modulo).

In your example aa is a byte variable. You can use --aa instead..

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