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Easy Learn Java: Programming Articles, Examples and Tips - Page 26


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Why I can not compile it:

Go to all tips in General Java

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 | Printer Friendly Page  Send to a Friend | Score: 0
Posted by jalex on Sunday, March 16, 2003 (03:32:41) (2878 reads)

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

Go to all tips in Daily Tips

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 | Printer Friendly Page  Send to a Friend | Score: 4
Posted by jalex on Friday, February 28, 2003 (00:00:00) (7901 reads)

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