Java Glossary : rotate

Last updated 2004-06-28 by Roedy Green ©1996-2004 Canadian Mind Products

Java definitions: 0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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rotate

Java has no built-in operator to rotate bits rather than just shift them. You can use the code below to get the effect.

/**
 * Rotates value n bits left through the sign.
 *
 * @param value Value to rotated.
 * @param n how many bits to rotate left.
 * must be in range 0..31
 * @return Value rotated.
 */
static public int rotateLeft ( int value , int n )
   {
   return(value << n) | (value >>> (32- n));
   }

/**
 * Rotates value n bits right through the sign.
 *
 * @param value Value to rotated.
 * @param n how many bits to rotate night.
 * must be in range 0..31
 * @return Value rotated.
 */
static public int rotateRight ( int value , int n )
   {
   return(value >>> n) | (value << (32- n));
   }

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