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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2 comments |    | Score: 0

Q: Why do we need to use shift operator in Java? Can you give some examples?

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Q: Why do we need to use shift operator in Java? Can you give some examples?

Answer: Using shift operators in Java we can:

• 1. Make faster integer division/multiplication operations:
  
  4839534 * 4
  can be done like this:
  4839534 << 2
  
  or
  
  543894 / 2
  can be done like this:
  543894 >> 1
  
  Shift operations much more faster than multiplication for most of processors.
  
• 2. Reassembling byte streams to int values
• 3. For accelerating operations with graphics since Red, Green and Blue colors coded by separate bytes.
• 4. Packing small numbers into one single long...

18 comments |    | Score: 4