Integer class « Integer « Numbers « Development

The Integer class wraps a value of the primitive type int. Integer class provides several methods for converting an int to a String and a String to an int.

Type	Field	Summary
static int	MAX_VALUE	Maximum value an int can have.
static int	MIN_VALUE	Minimum value an int can have.
static int	SIZE	The number of bits used to represent an int value.
static Class	TYPE	The Class instance representing the primitive type int.

Constructor Summary

Constructor	Summary
Integer(int value)	Creates an Integer object for the int value.
Integer(String s)	Creates an Integer object for the int value indicated by the String parameter.

Return an integer value as byte, double, float, int, long and short

Return	Method	Summary
byte	byteValue()	Returns this Integer as a byte.
double	doubleValue()	Returns this Integer as a double.
float	floatValue()	Returns this Integer as a float.
int	intValue()	Returns this Integer as an int.
long	longValue()	Returns this Integer as a long.
short	shortValue()	Returns this Integer as a short.

Compare two integer values

Return	Method	Summary
int	compareTo(Integer anotherInteger)	Compares two Integer objects numerically.
boolean	equals(Object obj)	Compares this object to the specified object.

Decode a string and return an integer value

Return	Method	Summary
static Integer	decode(String nm)	Decodes a String into an Integer.

Convert string to integer

Return	Method	Summary
static int	parseInt(String s)	Parses the string argument as a signed decimal integer.
static int	parseInt(String s, int radix)	Parses the string argument in the radix.
static Integer	valueOf(int i)	Returns a Integer instance representing the int value.
static Integer	valueOf(String s)	Returns an Integer holding the value of the String.
static Integer	valueOf(String s, int radix)	Returns an Integer from String based on the radix.

Convert integer to string

Return	Method	Summary
String	toString()	Returns a String object representing this Integer's value.
static String	toString(int i)	Returns a String object representing the specified integer.
static String	toString(int i, int radix)	Returns a string representation of i in radix.

Reverse and rotate the integer in binary format

Return	Method	Summary
static int	reverse(int i)	Reversing the bits.
static int	reverseBytes(int i)	Reversing the bytes.
static int	rotateLeft(int i, int distance)	Rotating the bits by distance.
static int	rotateRight(int i, int distance)	Rotating the bits by distance.

Bit oriented operation

Return	Method	Summary
static int	bitCount(int i)	Count bits in the binary representation of the specified int value.
static int	highestOneBit(int i)	Returns an int value with at most a single one-bit, in the position of the highest-order ("leftmost") one-bit.
static int	lowestOneBit(int i)	Returns an int value with at most a single one-bit, in the position of the lowest-order ("rightmost") one-bit.

Return system property as integer

Return	Method	Summary
static Integer	getInteger(String nm)	Get the system property.
static Integer	getInteger(String nm, int val)	Get the integer value of the system property with a default value.
static Integer	getInteger(String nm, Integer val)	Returns the integer value of the system property with a default value.

Get the leading and trailing zeros

Return	Method	Summary
static int	numberOfLeadingZeros(int i)	Returns the number of zero bits preceding the highest-order ("leftmost") one-bit.
static int	numberOfTrailingZeros(int i)	Returns the number of zero bits following the lowest-order ("rightmost") one-bit.

Get the sign

Return	Method	Summary
static int	signum(int i)	Returns the sign.

Convert integer to binary, hexdecimal and octal format

Return	Method	Summary
static String	toBinaryString(int i)	Return the binary string for i.
static String	toHexString(int i)	Returns a hes string for i.
static String	toOctalString(int i)	Returns a octal string for i.