Java Integer Tutorial, Reference and Example

Description

The Integer class wraps a value of the primitive type int in an object.

The Integer class wraps a value of the primitive type int in an object. An object of type Integer contains a single field whose type is int.

Fields

Name	Description
BYTES	get number of bytes used to represent an int value in two's complement binary form
MAX_VALUE	get the maximum value an int can have.
MIN_VALUE	get the minimum value an int can have
SIZE	get number of bits used to represent an int value in two's complement binary form.
TYPE	get Class instance representing the primitive type int

Constructors

Constructors
public Integer(int value) Java create Integer from int primitive value
public Integer(String s) throws NumberFormatException Java create Integer from String

Methods

Return	Description
int	bitCount(int i) get the number of one-bits in the two's complement binary representation of the specified int value
byte	byteValue() convert the value of this Integer as a byte
int	compare(int x, int y) Compares two int values numerically.
int	compareTo(Integer another_Integer) Compares two Integer objects numerically.
int	compareUnsigned(int x, int y) Compares two int values numerically treating the values as unsigned.
Integer	decode(String nm) throws NumberFormatException Decodes a String into an Integer
Optional<Integer>	describeConstable() get Optional containing the nominal descriptor for this instance
int	divideUnsigned(int dividend, int divisor) get unsigned quotient of dividing the first int by the second integer
double	doubleValue() convert the value of this Integer as a double
boolean	equals(Object obj) Compares this integer to the specified object.
float	floatValue() convert the value of this Integer as a float after a widening primitive conversion.
Integer	getInteger(String nm) get the integer value of the system property with the specified name.
Integer	getInteger(String nm, int val) get the integer value of the system property with the specified name with default value
Integer	getInteger(String nm, Integer val) get integer value of the system property with the specified name and default value
int	hashCode() Returns a hash code for this Integer
int	hashCode(int value) get the hash code for an int value; compatible with Integer
int	highestOneBit(int i) get int value in single one-bit from the left most highest one-bit
int	intValue() convert this Integer to int
long	longValue() convert Integer to long after a widening primitive conversion
int	lowestOneBit(int i) get a single bit from lowest-order right most one-bit from int
int	max(int a, int b) get the greater of two int values
int	min(int a, int b) get the smaller of two int values
int	numberOfLeadingZeros(int i) get the number of zero bits preceding the highest-order one-bit
int	numberOfTrailingZeros(int i) get the number of zero bits following the lowest-order one-bit
int	parseInt(String s, int radix) throws NumberFormatException Parses the string as a signed integer by the radix
int	parseInt(CharSequence s, int begin_Index, int end_Index, int radix) Parses string as a signed int by radix with offset
int	parseInt(String s) throws NumberFormatException Parses the string argument as a signed decimal integer
int	parseUnsignedInt(String s, int radix) throws NumberFormatException Parses the string as an unsigned integer by radix.
int	parseUnsignedInt(CharSequence s, int begin_Index, int end_Index, int radix) Parses string as an unsigned int in by radix with offset
int	parseUnsignedInt(String s) throws NumberFormatException Parses the string argument as an unsigned decimal integer.
int	remainderUnsigned(int dividend, int divisor) get the unsigned remainder by dividing two integers
Integer	resolveConstantDesc(MethodHandles.Lookup lookup) Resolves integer as a ConstantDesc
int	reverse(int i) reverse the order of the bits in int value
int	reverseBytes(int i) reverse the order of the bytes in the int value
int	rotateLeft(int i, int distance) rotate int value left by the specified number of bits
int	rotateRight(int i, int distance) rotate the int value right by the specified number of bits
short	shortValue() convert Integer as a short after a narrowing primitive conversion
int	signum(int i) get the sign for int value
int	sum(int a, int b) Adds two integers together as per the + operator
String	toBinaryString(int i) convert integer to binary in base 2
String	toHexString(int i) convert integer to hexadecimal integer in base 16.
String	toOctalString(int i) convert integer to unsigned integer in base 8
String	toString(int i, int radix) convert int by radix
String	toString(int i) convert integer to a String object in static way
String	toString() convert integer to a String object
long	toUnsignedLong(int x) Converts integer to long by an unsigned conversion
String	toUnsignedString(int i, int radix) convert int to unsigned integer value by radix
String	toUnsignedString(int i) Returns a string representation of the argument as an unsigned decimal value
Integer	valueOf(String s, int radix) throws NumberFormatException parse string to Integer by radix
Integer	valueOf(String s) throws NumberFormatException convert String to an Integer
Integer	valueOf(int i) convert int primitive to Integer object

Example

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