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Oracle® Coherence Java API Reference
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## com.tangosol.util
Class BitHelper

    java.lang.Object
      com.tangosol.util.Base
          com.tangosol.util.BitHelper

Direct Known Subclasses:
  ExternalizableHelper, PartitionSet

    public class BitHelper

extends Base

A collection of methods for bit-based operations.

Author:
  cp 2006.01.10 starting from the MemberSet implementation

Constructor Summary
`BitHelper()`

Method Summary
`static int` | `countBits(byte b)` Count the number of bits set in the passed integral value.
`static int` | `countBits(int n)` Count the number of bits set in the passed integral value.
`static int` | `countBits(long l)` Count the number of bits set in the passed integral value.
`static int` | `indexOfLSB(byte b)` Determine the least significant bit of the passed integral value.
`static int` | `indexOfLSB(int n)` Determine the least significant bit of the passed integral value.
`static int` | `indexOfLSB(long l)` Determine the least significant bit of the passed integral value.
`static int` | `indexOfMSB(byte b)` Determine the most significant bit of the passed integral value.
`static int` | `indexOfMSB(int n)` Determine the most significant bit of the passed integral value.
`static int` | `indexOfMSB(long l)` Determine the most significant bit of the passed integral value.
`static byte` | `rotateLeft(byte b, int cBits)` Rotate the bits of the passed byte value to the left by the number of bits specified.
`static int` | `rotateLeft(int n, int cBits)` Rotate the bits of the passed int value to the left by the number of bits specified.
`static long` | `rotateLeft(long n, int cBits)` Rotate the bits of the passed long value to the left by the number of bits specified.
`static byte` | `rotateRight(byte b, int cBits)` Rotate the bits of the passed byte value to the right by the number of bits specified.
`static int` | `rotateRight(int n, int cBits)` Rotate the bits of the passed int value to the right by the number of bits specified.
`static long` | `rotateRight(long n, int cBits)` Rotate the bits of the passed long value to the right by the number of bits specified.
`static java.lang.String` | `toBitString(byte b)` Convert a byte to a String of ones and zeros.
`static java.lang.String` | `toBitString(int n)` Convert an int to a String of ones and zeros.
`static java.lang.String` | `toBitString(long l)` Convert a long to a String of ones and zeros.

Constructor Detail

### BitHelper

    public BitHelper()

Method Detail

### rotateLeft

    public static byte rotateLeft(byte b,
                                  int cBits)

  Rotate the bits of the passed byte value to the left by the number of bits specified.

  Parameters:
    `b` - a `byte` value
    `cBits` - the number of bit rotations to perform
  Returns:
    the value with its bits rotated as indicated
  Since:
    Coherence 3.5

### rotateRight

    public static byte rotateRight(byte b,
                                   int cBits)

  Rotate the bits of the passed byte value to the right by the number of bits specified.

  Parameters:
    `b` - a `byte` value
    `cBits` - the number of bit rotations to perform
  Returns:
    the value with its bits rotated as indicated
  Since:
    Coherence 3.5

### rotateLeft

    public static int rotateLeft(int n,
                                 int cBits)

  Rotate the bits of the passed int value to the left by the number of bits specified.

  Parameters:
    `n` - an `int` value
    `cBits` - the number of bit rotations to perform
  Returns:
    the value with its bits rotated as indicated
  Since:
    Coherence 3.5

### rotateRight

    public static int rotateRight(int n,
                                  int cBits)

  Rotate the bits of the passed int value to the right by the number of bits specified.

  Parameters:
    `n` - an `int` value
    `cBits` - the number of bit rotations to perform
  Returns:
    the value with its bits rotated as indicated
  Since:
    Coherence 3.5

### rotateLeft

    public static long rotateLeft(long n,
                                  int cBits)

  Rotate the bits of the passed long value to the left by the number of bits specified.

  Parameters:
    `n` - a `long` value
    `cBits` - the number of bit rotations to perform
  Returns:
    the value with its bits rotated as indicated
  Since:
    Coherence 3.5

### rotateRight

    public static long rotateRight(long n,
                                   int cBits)

  Rotate the bits of the passed long value to the right by the number of bits specified.

  Parameters:
    `n` - a `long` value
    `cBits` - the number of bit rotations to perform
  Returns:
    the value with its bits rotated as indicated
  Since:
    Coherence 3.5

### countBits

    public static int countBits(byte b)

  Count the number of bits set in the passed integral value.

  Parameters:
    `b` - a byte
  Returns:
    the number of bits set in the byte [0..8]

### countBits

    public static int countBits(int n)

  Count the number of bits set in the passed integral value.

  Parameters:
    `n` - an int
  Returns:
    the number of bits set in the int [0..32]

### countBits

    public static int countBits(long l)

  Count the number of bits set in the passed integral value.

  Parameters:
    `l` - a long
  Returns:
    the number of bits set in the long [0..64]

### indexOfMSB

    public static int indexOfMSB(byte b)

  Determine the most significant bit of the passed integral value.

  Parameters:
    `b` - a byte
  Returns:
    -1 if no bits are set; otherwise, the bit position `p` of the most significant bit such that `1 << p` is the most significant bit of `b`

### indexOfMSB

    public static int indexOfMSB(int n)

  Determine the most significant bit of the passed integral value.

  Parameters:
    `n` - an int
  Returns:
    -1 if no bits are set; otherwise, the bit position `p` of the most significant bit such that `1 << p` is the most significant bit of `n`

### indexOfMSB

    public static int indexOfMSB(long l)

  Determine the most significant bit of the passed integral value.

  Parameters:
    `l` - a long
  Returns:
    -1 if no bits are set; otherwise, the bit position `p` of the most significant bit such that `1 << p` is the most significant bit of `l`

### indexOfLSB

    public static int indexOfLSB(byte b)

  Determine the least significant bit of the passed integral value.

  Parameters:
    `b` - a byte
  Returns:
    -1 if no bits are set; otherwise, the bit position `p` of the least significant bit such that `1 << p` is the least significant bit of `b`

### indexOfLSB

    public static int indexOfLSB(int n)

  Determine the least significant bit of the passed integral value.

  Parameters:
    `n` - an int
  Returns:
    -1 if no bits are set; otherwise, the bit position `p` of the least significant bit such that `1 << p` is the least significant bit of `n`

### indexOfLSB

    public static int indexOfLSB(long l)

  Determine the least significant bit of the passed integral value.

  Parameters:
    `l` - a long
  Returns:
    -1 if no bits are set; otherwise, the bit position `p` of the least significant bit such that `1 << p` is the least significant bit of `l`

### toBitString

    public static java.lang.String toBitString(byte b)

  Convert a byte to a String of ones and zeros.

  Parameters:
    `b` - a byte
  Returns:
    a String of ones and zeros representing the byte value

### toBitString

    public static java.lang.String toBitString(int n)

  Convert an int to a String of ones and zeros.

  Parameters:
    `n` - an int
  Returns:
    a String of ones and zeros representing the int value

### toBitString

    public static java.lang.String toBitString(long l)

  Convert a long to a String of ones and zeros.

  Parameters:
    `l` - a long
  Returns:
    a String of ones and zeros representing the long value

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Oracle® Coherence Java API Reference
v3.5.3
E15583-01
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