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Shift operators

vamsi acharya
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Joined: Jun 28, 2009
Posts: 55

Hello guys one question has been hovering me from the beginning of my java learning career .... why do we use shift operators i have been referring to many books and googled it online still not sure about the usage and pondering about its working ....can anybody please elucidate me ???


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Jeanne Boyarsky
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Joined: May 26, 2003
Posts: 29219
    
134

Vamsi,
In practice, most people don't use the shift operators. Maybe if you were writing a low level program with bytes and needed to shuffle them.


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Henry Wong
author
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Joined: Sep 28, 2004
Posts: 18101
    
  39


Obvious uses are...

1. Graphics. Shifting is needed to create bit patterns -- or to create masks that can be used to set (OR) or clear (AND) dots.

2. Networking. Shifting is need to create network masks. The masks needed to set or clear bits specified in a protocol.

3. Security. Encryption needs this a lot.

Less obvious use... Some mathematical operations are faster with shifting. With modern processors, this is not true anymore, as they are loaded with instructions that can do practically anything needed by math.


Now, all of this may be moot, as Java has libraries that does all of this for you. In fact, most new developers rarely, if ever, encounter a need to use the shifting (or bitwise) operators.... which is a shame.

Henry


Books: Java Threads, 3rd Edition, Jini in a Nutshell, and Java Gems (contributor)
vamsi acharya
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Joined: Jun 28, 2009
Posts: 55

oh thank you henry......This info is very much needed to me
Campbell Ritchie
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Joined: Oct 13, 2005
Posts: 36453
    
  15
What about calculating hash codes for longs and doubles?
 
I agree. Here's the link: http://aspose.com/file-tools
 
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