Bit Rotation

Question

Hello all.
Is there any build in left and right bit rotation methods?
I'm tring to do some bit manipulation and am not having such an easy go of it in Java. Any suggestions?

Answer 1

I don't know of any built in rotation operators but you can always rotate with simple arithmetic:
public static final int bitRotateLeft(int x, int count) {
  return ( (x << count) | (x >>> (32 - count)) );
public static final int bitRotateRight(int x, int count) {
  return ( (x >>> count) | (x << (32 - count)) );
//test
int i = 149;
if(bitRotateLeft(i, 1) == 43)SYstem.out.println("rotate left");
if(bitRotateRight(i, 1) == 202)SYstem.out.println("rotate right");