Class BitUtil

java.lang.Object

fc.util.BitUtil

public class BitUtil
extends Object

Misc Binary/bit operation related utility methods. All bit positions are 0-based. For example, to set a 8th logical bit (highest bit in a byte), say setBit(byte, 7).

Of course, since most methods take primitive types, the return value must be assigned back to the variable that is being set, i.e. int a = 0; a = BitSet.setBit(a, 1);

Constructor Summary

Constructors

Constructor	Description
BitUtil()

Method Summary

Modifier and Type	Method	Description
static byte	clearBit(byte i, int num)
static char	clearBit(char i, int num)
static int	clearBit(int i, int num)
static long	clearBit(long i, int num)
static short	clearBit(short i, int num)
static boolean	isBitSet(byte i, int num)	All indexes are zero based (the right most bit is bit 0).
static boolean	isBitSet(char i, int num)
static boolean	isBitSet(int i, int num)
static boolean	isBitSet(long i, int num)
static boolean	isBitSet(short i, int num)
static void	main(String[] args)
static byte	setBit(byte i, int num)
static char	setBit(char i, int num)
static int	setBit(int i, int num)
static long	setBit(long i, long num)
static short	setBit(short i, int num)
static String	toBinaryString(byte i)
static String	toBinaryString(byte i, String format)	returns a 8 char binary digit string.
static String	toBinaryString(char i)	returns a 16 char binary digit string
static String	toBinaryString(char i, String format)	returns a 16 char binary digit string.
static String	toBinaryString(int i)	returns a 32 char binary digit string (Integer.toBinaryString is not padded, can be less than 32 chars)
static String	toBinaryString(int i, String format)	returns a 32char binary digit string (Long.toBinaryString is not padded, can be less than 32 chars).
static String	toBinaryString(long i)	returns a 64 char binary digit string (Long.toBinaryString is not padded, can be less than 64 chars))
static String	toBinaryString(long i, String format)	returns a 64 char binary digit string (Long.toBinaryString is not padded, can be less than 64 chars).
static String	toBinaryString(short i)	returns a 16 char binary digit string
static String	toBinaryString(short i, String format)	returns a 16 char binary digit string.

Methods inherited from class Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

BitUtil

public BitUtil()

Method Details

isBitSet

public static boolean isBitSet(byte i,
 int num)

All indexes are zero based (the right most bit is bit 0). returns true is specified bit in the specified byte is set. The num parameter is the bit position (0-based index). Set means the bit has value 1.

isBitSet

public static boolean isBitSet(short i,
 int num)

isBitSet

public static boolean isBitSet(char i,
 int num)

isBitSet

public static boolean isBitSet(int i,
 int num)

isBitSet

public static boolean isBitSet(long i,
 int num)

setBit

public static byte setBit(byte i,
 int num)

setBit

public static short setBit(short i,
 int num)

setBit

public static char setBit(char i,
 int num)

setBit

public static int setBit(int i,
 int num)

setBit

public static long setBit(long i,
 long num)

clearBit

public static byte clearBit(byte i,
 int num)

clearBit

public static short clearBit(short i,
 int num)

clearBit

public static char clearBit(char i,
 int num)

clearBit

public static int clearBit(int i,
 int num)

clearBit

public static long clearBit(long i,
 int num)

toBinaryString

public static String toBinaryString(byte i)

toBinaryString

public static String toBinaryString(short i)

returns a 16 char binary digit string

toBinaryString

public static String toBinaryString(char i)

returns a 16 char binary digit string

toBinaryString

public static String toBinaryString(int i)

returns a 32 char binary digit string (Integer.toBinaryString is not padded, can be less than 32 chars)

toBinaryString

public static String toBinaryString(long i)

returns a 64 char binary digit string (Long.toBinaryString is not padded, can be less than 64 chars))

toBinaryString

public static String toBinaryString(byte i,
 String format)

returns a 8 char binary digit string.

The format string has a number and separator, like "4 " which will print chunks of size with the specified . The number must be between [1-9] and separator must be a single character, like: | or space. Errors in the format string are ignored and default values are used instead (4 and space).

toBinaryString

public static String toBinaryString(short i,
 String format)

returns a 16 char binary digit string.

The format string has a number and separator, like "4 " which will print chunks of size with the specified . The number must be between [1-9] and separator must be a single character, like: | or space. Errors in the format string are ignored and default values are used instead (4 and space).

toBinaryString

public static String toBinaryString(char i,
 String format)

returns a 16 char binary digit string.

The format string has a number and separator, like "4 " which will print chunks of size num with the specified separator.

toBinaryString

public static String toBinaryString(int i,
 String format)

returns a 32char binary digit string (Long.toBinaryString is not padded, can be less than 32 chars).

The format string has a number and separator, like "4 " which will print chunks of size with the specified . The number must be between [1-9] and separator must be a single character, like: | or space. Errors in the format string are ignored and default values are used instead (4 and space).

toBinaryString

public static String toBinaryString(long i,
 String format)

returns a 64 char binary digit string (Long.toBinaryString is not padded, can be less than 64 chars).

The format string has a number and separator, like "4 " which will print chunks of size with the specified . The number must be between [1-9] and separator must be a single character, like: | or space. Errors in the format string are ignored and default values are used instead (4 and space).

main

public static void main(String[] args)