Integer (Java SE 10 & JDK 10 ) (original) (raw)

Field Summary

Fields

Modifier and Type	Field	Description
static int	BYTES	The number of bytes used to represent an int value in two's complement binary form.
static int	MAX_VALUE	A constant holding the maximum value an int can have, 231-1.
static int	MIN_VALUE	A constant holding the minimum value an int can have, -231.
static int	SIZE	The number of bits used to represent an int value in two's complement binary form.
static Class<Integer>	TYPE	The Class instance representing the primitive typeint.

Constructor Summary

Constructors

Constructor	Description
Integer(int value)	Deprecated.
Integer(String s)	Deprecated.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods

Modifier and Type	Method	Description
static int	bitCount(int i)	Returns the number of one-bits in the two's complement binary representation of the specified int value.
byte	byteValue()	Returns the value of this Integer as a byte after a narrowing primitive conversion.
static int	compare(int x, int y)	Compares two int values numerically.
int	compareTo(Integer anotherInteger)	Compares two Integer objects numerically.
static int	compareUnsigned(int x, int y)	Compares two int values numerically treating the values as unsigned.
static Integer	decode(String nm)	Decodes a String into an Integer.
static int	divideUnsigned(int dividend, int divisor)	Returns the unsigned quotient of dividing the first argument by the second where each argument and the result is interpreted as an unsigned value.
double	doubleValue()	Returns the value of this Integer as a double after a widening primitive conversion.
boolean	equals(Object obj)	Compares this object to the specified object.
float	floatValue()	Returns the value of this Integer as a float after a widening primitive conversion.
static Integer	getInteger(String nm)	Determines the integer value of the system property with the specified name.
static Integer	getInteger(String nm, int val)	Determines the integer value of the system property with the specified name.
static Integer	getInteger(String nm,Integer val)	Returns the integer value of the system property with the specified name.
int	hashCode()	Returns a hash code for this Integer.
static int	hashCode(int value)	Returns a hash code for an int value; compatible withInteger.hashCode().
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 in the specifiedint value.
int	intValue()	Returns the value of this Integer as anint.
long	longValue()	Returns the value of this Integer as a long after a widening primitive conversion.
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 in the specifiedint value.
static int	max(int a, int b)	Returns the greater of two int values as if by calling Math.max.
static int	min(int a, int b)	Returns the smaller of two int values as if by calling Math.min.
static int	numberOfLeadingZeros(int i)	Returns the number of zero bits preceding the highest-order ("leftmost") one-bit in the two's complement binary representation of the specified int value.
static int	numberOfTrailingZeros(int i)	Returns the number of zero bits following the lowest-order ("rightmost") one-bit in the two's complement binary representation of the specifiedint value.
static int	parseInt(CharSequence s, int beginIndex, int endIndex, int radix)	Parses the CharSequence argument as a signed int in the specified radix, beginning at the specified beginIndex and extending to endIndex - 1.
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 as a signed integer in the radix specified by the second argument.
static int	parseUnsignedInt(CharSequence s, int beginIndex, int endIndex, int radix)	Parses the CharSequence argument as an unsigned int in the specified radix, beginning at the specifiedbeginIndex and extending to endIndex - 1.
static int	parseUnsignedInt(String s)	Parses the string argument as an unsigned decimal integer.
static int	parseUnsignedInt(String s, int radix)	Parses the string argument as an unsigned integer in the radix specified by the second argument.
static int	remainderUnsigned(int dividend, int divisor)	Returns the unsigned remainder from dividing the first argument by the second where each argument and the result is interpreted as an unsigned value.
static int	reverse(int i)	Returns the value obtained by reversing the order of the bits in the two's complement binary representation of the specified int value.
static int	reverseBytes(int i)	Returns the value obtained by reversing the order of the bytes in the two's complement representation of the specified int value.
static int	rotateLeft(int i, int distance)	Returns the value obtained by rotating the two's complement binary representation of the specified int value left by the specified number of bits.
static int	rotateRight(int i, int distance)	Returns the value obtained by rotating the two's complement binary representation of the specified int value right by the specified number of bits.
short	shortValue()	Returns the value of this Integer as a short after a narrowing primitive conversion.
static int	signum(int i)	Returns the signum function of the specified int value.
static int	sum(int a, int b)	Adds two integers together as per the + operator.
static String	toBinaryString(int i)	Returns a string representation of the integer argument as an unsigned integer in base 2.
static String	toHexString(int i)	Returns a string representation of the integer argument as an unsigned integer in base 16.
static String	toOctalString(int i)	Returns a string representation of the integer argument as an unsigned integer in base 8.
String	toString()	Returns a String object representing thisInteger'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 the first argument in the radix specified by the second argument.
static long	toUnsignedLong(int x)	Converts the argument to a long by an unsigned conversion.
static String	toUnsignedString(int i)	Returns a string representation of the argument as an unsigned decimal value.
static String	toUnsignedString(int i, int radix)	Returns a string representation of the first argument as an unsigned integer value in the radix specified by the second argument.
static Integer	valueOf(int i)	Returns an Integer instance representing the specifiedint value.
static Integer	valueOf(String s)	Returns an Integer object holding the value of the specified String.
static Integer	valueOf(String s, int radix)	Returns an Integer object holding the value extracted from the specified String when parsed with the radix given by the second argument.

   * ### Methods declared in class java.lang.[Object](../../java/lang/Object.html "class in java.lang")  
   `[clone](../../java/lang/Object.html#clone%28%29), [finalize](../../java/lang/Object.html#finalize%28%29), [getClass](../../java/lang/Object.html#getClass%28%29), [notify](../../java/lang/Object.html#notify%28%29), [notifyAll](../../java/lang/Object.html#notifyAll%28%29), [wait](../../java/lang/Object.html#wait%28%29), [wait](../../java/lang/Object.html#wait%28long%29), [wait](../../java/lang/Object.html#wait%28long,int%29)`

Field Detail

 * #### MIN\_VALUE  
 [@Native](../../java/lang/annotation/Native.html "annotation in java.lang.annotation")  
 public static final int MIN_VALUE  
 A constant holding the minimum value an `int` can have, -231.  
 See Also:  
 [Constant Field Values](../../constant-values.html#java.lang.Integer.MIN%5FVALUE)  
 * #### MAX\_VALUE  
 [@Native](../../java/lang/annotation/Native.html "annotation in java.lang.annotation")  
 public static final int MAX_VALUE  
 A constant holding the maximum value an `int` can have, 231\-1.  
 See Also:  
 [Constant Field Values](../../constant-values.html#java.lang.Integer.MAX%5FVALUE)  
 * #### TYPE  
 public static final [Class](../../java/lang/Class.html "class in java.lang")<[Integer](../../java/lang/Integer.html "class in java.lang")> TYPE  
 The `Class` instance representing the primitive type`int`.  
 Since:  
 1.1  
 * #### SIZE  
 [@Native](../../java/lang/annotation/Native.html "annotation in java.lang.annotation")  
 public static final int SIZE  
 The number of bits used to represent an `int` value in two's complement binary form.  
 Since:  
 1.5  
 See Also:  
 [Constant Field Values](../../constant-values.html#java.lang.Integer.SIZE)  
 * #### BYTES  
 public static final int BYTES  
 The number of bytes used to represent an `int` value in two's complement binary form.  
 Since:  
 1.8  
 See Also:  
 [Constant Field Values](../../constant-values.html#java.lang.Integer.BYTES)

Constructor Detail

* #### Integer  
[@Deprecated](../../java/lang/Deprecated.html "annotation in java.lang")([since](../../java/lang/Deprecated.html#since%28%29)="9")  
public Integer(int value)  
Constructs a newly allocated `Integer` object that represents the specified `int` value.  
Parameters:  
`value` \- the value to be represented by the`Integer` object.  
* #### Integer  
[@Deprecated](../../java/lang/Deprecated.html "annotation in java.lang")([since](../../java/lang/Deprecated.html#since%28%29)="9")  
public Integer([String](../../java/lang/String.html "class in java.lang") s)  
        throws [NumberFormatException](../../java/lang/NumberFormatException.html "class in java.lang")  
Constructs a newly allocated `Integer` object that represents the `int` value indicated by the`String` parameter. The string is converted to an`int` value in exactly the manner used by the`parseInt` method for radix 10.  
Parameters:  
`s` \- the `String` to be converted to an `Integer`.  
Throws:  
`[NumberFormatException](../../java/lang/NumberFormatException.html "class in java.lang")` \- if the `String` does not contain a parsable integer.

Method Detail

* #### toString  
public static [String](../../java/lang/String.html "class in java.lang") toString(int i,  
                              int radix)  
Returns a string representation of the first argument in the radix specified by the second argument.  
If the radix is smaller than `Character.MIN_RADIX` or larger than `Character.MAX_RADIX`, then the radix`10` is used instead.  
If the first argument is negative, the first element of the result is the ASCII minus character `'-'` (`'\u002D'`). If the first argument is not negative, no sign character appears in the result.  
The remaining characters of the result represent the magnitude of the first argument. If the magnitude is zero, it is represented by a single zero character `'0'` (`'\u0030'`); otherwise, the first character of the representation of the magnitude will not be the zero character. The following ASCII characters are used as digits:  
> `0123456789abcdefghijklmnopqrstuvwxyz`  
 These are `'\u0030'` through`'\u0039'` and `'\u0061'` through`'\u007A'`. If `radix` isN, then the first N of these characters are used as radix-N digits in the order shown. Thus, the digits for hexadecimal (radix 16) are`0123456789abcdef`. If uppercase letters are desired, the [String.toUpperCase()](../../java/lang/String.html#toUpperCase%28%29) method may be called on the result:  
> `Integer.toString(n, 16).toUpperCase()`  
Parameters:  
`i` \- an integer to be converted to a string.  
`radix` \- the radix to use in the string representation.  
Returns:  
a string representation of the argument in the specified radix.  
See Also:  
[Character.MAX\_RADIX](../../java/lang/Character.html#MAX%5FRADIX), [Character.MIN\_RADIX](../../java/lang/Character.html#MIN%5FRADIX)  
* #### toUnsignedString  
public static [String](../../java/lang/String.html "class in java.lang") toUnsignedString(int i,  
                                      int radix)  
Returns a string representation of the first argument as an unsigned integer value in the radix specified by the second argument.  
If the radix is smaller than `Character.MIN_RADIX` or larger than `Character.MAX_RADIX`, then the radix`10` is used instead.  
Note that since the first argument is treated as an unsigned value, no leading sign character is printed.  
If the magnitude is zero, it is represented by a single zero character `'0'` (`'\u0030'`); otherwise, the first character of the representation of the magnitude will not be the zero character.  
The behavior of radixes and the characters used as digits are the same as [toString](../../java/lang/Integer.html#toString%28int,int%29).  
Parameters:  
`i` \- an integer to be converted to an unsigned string.  
`radix` \- the radix to use in the string representation.  
Returns:  
an unsigned string representation of the argument in the specified radix.  
Since:  
1.8  
See Also:  
[toString(int, int)](../../java/lang/Integer.html#toString%28int,int%29)  
* #### toHexString  
public static [String](../../java/lang/String.html "class in java.lang") toHexString(int i)  
Returns a string representation of the integer argument as an unsigned integer in base 16.  
The unsigned integer value is the argument plus 232 if the argument is negative; otherwise, it is equal to the argument. This value is converted to a string of ASCII digits in hexadecimal (base 16) with no extra leading`0`s.  
The value of the argument can be recovered from the returned string `s` by calling [Integer.parseUnsignedInt(s, 16)](../../java/lang/Integer.html#parseUnsignedInt%28java.lang.String,int%29).  
If the unsigned magnitude is zero, it is represented by a single zero character `'0'` (`'\u0030'`); otherwise, the first character of the representation of the unsigned magnitude will not be the zero character. The following characters are used as hexadecimal digits:  
> `0123456789abcdef`  
 These are the characters `'\u0030'` through`'\u0039'` and `'\u0061'` through`'\u0066'`. If uppercase letters are desired, the [String.toUpperCase()](../../java/lang/String.html#toUpperCase%28%29) method may be called on the result:  
> `Integer.toHexString(n).toUpperCase()`  
Parameters:  
`i` \- an integer to be converted to a string.  
Returns:  
the string representation of the unsigned integer value represented by the argument in hexadecimal (base 16).  
Since:  
1.0.2  
See Also:  
[parseUnsignedInt(String, int)](../../java/lang/Integer.html#parseUnsignedInt%28java.lang.String,int%29), [toUnsignedString(int, int)](../../java/lang/Integer.html#toUnsignedString%28int,int%29)  
* #### toOctalString  
public static [String](../../java/lang/String.html "class in java.lang") toOctalString(int i)  
Returns a string representation of the integer argument as an unsigned integer in base 8.  
The unsigned integer value is the argument plus 232 if the argument is negative; otherwise, it is equal to the argument. This value is converted to a string of ASCII digits in octal (base 8) with no extra leading `0`s.  
The value of the argument can be recovered from the returned string `s` by calling [Integer.parseUnsignedInt(s, 8)](../../java/lang/Integer.html#parseUnsignedInt%28java.lang.String,int%29).  
If the unsigned magnitude is zero, it is represented by a single zero character `'0'` (`'\u0030'`); otherwise, the first character of the representation of the unsigned magnitude will not be the zero character. The following characters are used as octal digits:  
> `01234567`  
 These are the characters `'\u0030'` through`'\u0037'`.  
Parameters:  
`i` \- an integer to be converted to a string.  
Returns:  
the string representation of the unsigned integer value represented by the argument in octal (base 8).  
Since:  
1.0.2  
See Also:  
[parseUnsignedInt(String, int)](../../java/lang/Integer.html#parseUnsignedInt%28java.lang.String,int%29), [toUnsignedString(int, int)](../../java/lang/Integer.html#toUnsignedString%28int,int%29)  
* #### toBinaryString  
public static [String](../../java/lang/String.html "class in java.lang") toBinaryString(int i)  
Returns a string representation of the integer argument as an unsigned integer in base 2.  
The unsigned integer value is the argument plus 232 if the argument is negative; otherwise it is equal to the argument. This value is converted to a string of ASCII digits in binary (base 2) with no extra leading `0`s.  
The value of the argument can be recovered from the returned string `s` by calling [Integer.parseUnsignedInt(s, 2)](../../java/lang/Integer.html#parseUnsignedInt%28java.lang.String,int%29).  
If the unsigned magnitude is zero, it is represented by a single zero character `'0'` (`'\u0030'`); otherwise, the first character of the representation of the unsigned magnitude will not be the zero character. The characters `'0'` (`'\u0030'`) and ` '1'` (`'\u0031'`) are used as binary digits.  
Parameters:  
`i` \- an integer to be converted to a string.  
Returns:  
the string representation of the unsigned integer value represented by the argument in binary (base 2).  
Since:  
1.0.2  
See Also:  
[parseUnsignedInt(String, int)](../../java/lang/Integer.html#parseUnsignedInt%28java.lang.String,int%29), [toUnsignedString(int, int)](../../java/lang/Integer.html#toUnsignedString%28int,int%29)  
* #### toString  
public static [String](../../java/lang/String.html "class in java.lang") toString(int i)  
Returns a `String` object representing the specified integer. The argument is converted to signed decimal representation and returned as a string, exactly as if the argument and radix 10 were given as arguments to the [toString(int, int)](../../java/lang/Integer.html#toString%28int,int%29) method.  
Parameters:  
`i` \- an integer to be converted.  
Returns:  
a string representation of the argument in base 10.  
* #### toUnsignedString  
public static [String](../../java/lang/String.html "class in java.lang") toUnsignedString(int i)  
Returns a string representation of the argument as an unsigned decimal value. The argument is converted to unsigned decimal representation and returned as a string exactly as if the argument and radix 10 were given as arguments to the [toUnsignedString(int, int)](../../java/lang/Integer.html#toUnsignedString%28int,int%29) method.  
Parameters:  
`i` \- an integer to be converted to an unsigned string.  
Returns:  
an unsigned string representation of the argument.  
Since:  
1.8  
See Also:  
[toUnsignedString(int, int)](../../java/lang/Integer.html#toUnsignedString%28int,int%29)  
* #### parseInt  
public static int parseInt([String](../../java/lang/String.html "class in java.lang") s,  
                           int radix)  
                    throws [NumberFormatException](../../java/lang/NumberFormatException.html "class in java.lang")  
Parses the string argument as a signed integer in the radix specified by the second argument. The characters in the string must all be digits of the specified radix (as determined by whether [Character.digit(char, int)](../../java/lang/Character.html#digit%28char,int%29) returns a nonnegative value), except that the first character may be an ASCII minus sign `'-'` (`'\u002D'`) to indicate a negative value or an ASCII plus sign `'+'` (`'\u002B'`) to indicate a positive value. The resulting integer value is returned.  
An exception of type `NumberFormatException` is thrown if any of the following situations occurs:  
         * The first argument is `null` or is a string of length zero.  
         * The radix is either smaller than[Character.MIN\_RADIX](../../java/lang/Character.html#MIN%5FRADIX) or larger than [Character.MAX\_RADIX](../../java/lang/Character.html#MAX%5FRADIX).  
         * Any character of the string is not a digit of the specified radix, except that the first character may be a minus sign`'-'` (`'\u002D'`) or plus sign`'+'` (`'\u002B'`) provided that the string is longer than length 1.  
         * The value represented by the string is not a value of type`int`.  
Examples:  
> parseInt("0", 10) returns 0  
> parseInt("473", 10) returns 473  
> parseInt("+42", 10) returns 42  
> parseInt("-0", 10) returns 0  
> parseInt("-FF", 16) returns -255  
> parseInt("1100110", 2) returns 102  
> parseInt("2147483647", 10) returns 2147483647  
> parseInt("-2147483648", 10) returns -2147483648  
> parseInt("2147483648", 10) throws a NumberFormatException  
> parseInt("99", 8) throws a NumberFormatException  
> parseInt("Kona", 10) throws a NumberFormatException  
> parseInt("Kona", 27) returns 411787  
>  
Parameters:  
`s` \- the `String` containing the integer representation to be parsed  
`radix` \- the radix to be used while parsing `s`.  
Returns:  
the integer represented by the string argument in the specified radix.  
Throws:  
`[NumberFormatException](../../java/lang/NumberFormatException.html "class in java.lang")` \- if the `String` does not contain a parsable `int`.  
* #### parseInt  
public static int parseInt([CharSequence](../../java/lang/CharSequence.html "interface in java.lang") s,  
                           int beginIndex,  
                           int endIndex,  
                           int radix)  
                    throws [NumberFormatException](../../java/lang/NumberFormatException.html "class in java.lang")  
Parses the [CharSequence](../../java/lang/CharSequence.html "interface in java.lang") argument as a signed `int` in the specified `radix`, beginning at the specified `beginIndex` and extending to `endIndex - 1`.  
The method does not take steps to guard against the`CharSequence` being mutated while parsing.  
Parameters:  
`s` \- the `CharSequence` containing the `int` representation to be parsed  
`beginIndex` \- the beginning index, inclusive.  
`endIndex` \- the ending index, exclusive.  
`radix` \- the radix to be used while parsing `s`.  
Returns:  
the signed `int` represented by the subsequence in the specified radix.  
Throws:  
`[NullPointerException](../../java/lang/NullPointerException.html "class in java.lang")` \- if `s` is null.  
`[IndexOutOfBoundsException](../../java/lang/IndexOutOfBoundsException.html "class in java.lang")` \- if `beginIndex` is negative, or if `beginIndex` is greater than`endIndex` or if `endIndex` is greater than`s.length()`.  
`[NumberFormatException](../../java/lang/NumberFormatException.html "class in java.lang")` \- if the `CharSequence` does not contain a parsable `int` in the specified`radix`, or if `radix` is either smaller than[Character.MIN\_RADIX](../../java/lang/Character.html#MIN%5FRADIX) or larger than[Character.MAX\_RADIX](../../java/lang/Character.html#MAX%5FRADIX).  
Since:  
9  
* #### parseInt  
public static int parseInt([String](../../java/lang/String.html "class in java.lang") s)  
                    throws [NumberFormatException](../../java/lang/NumberFormatException.html "class in java.lang")  
Parses the string argument as a signed decimal integer. The characters in the string must all be decimal digits, except that the first character may be an ASCII minus sign `'-'` (`'\u002D'`) to indicate a negative value or an ASCII plus sign `'+'` (`'\u002B'`) to indicate a positive value. The resulting integer value is returned, exactly as if the argument and the radix 10 were given as arguments to the [parseInt(java.lang.String, int)](../../java/lang/Integer.html#parseInt%28java.lang.String,int%29) method.  
Parameters:  
`s` \- a `String` containing the `int` representation to be parsed  
Returns:  
the integer value represented by the argument in decimal.  
Throws:  
`[NumberFormatException](../../java/lang/NumberFormatException.html "class in java.lang")` \- if the string does not contain a parsable integer.  
* #### parseUnsignedInt  
public static int parseUnsignedInt([String](../../java/lang/String.html "class in java.lang") s,  
                                   int radix)  
                            throws [NumberFormatException](../../java/lang/NumberFormatException.html "class in java.lang")  
Parses the string argument as an unsigned integer in the radix specified by the second argument. An unsigned integer maps the values usually associated with negative numbers to positive numbers larger than `MAX_VALUE`. The characters in the string must all be digits of the specified radix (as determined by whether [Character.digit(char, int)](../../java/lang/Character.html#digit%28char,int%29) returns a nonnegative value), except that the first character may be an ASCII plus sign `'+'` (`'\u002B'`). The resulting integer value is returned.  
An exception of type `NumberFormatException` is thrown if any of the following situations occurs:  
         * The first argument is `null` or is a string of length zero.  
         * The radix is either smaller than[Character.MIN\_RADIX](../../java/lang/Character.html#MIN%5FRADIX) or larger than [Character.MAX\_RADIX](../../java/lang/Character.html#MAX%5FRADIX).  
         * Any character of the string is not a digit of the specified radix, except that the first character may be a plus sign`'+'` (`'\u002B'`) provided that the string is longer than length 1.  
         * The value represented by the string is larger than the largest unsigned `int`, 232\-1.  
Parameters:  
`s` \- the `String` containing the unsigned integer representation to be parsed  
`radix` \- the radix to be used while parsing `s`.  
Returns:  
the integer represented by the string argument in the specified radix.  
Throws:  
`[NumberFormatException](../../java/lang/NumberFormatException.html "class in java.lang")` \- if the `String` does not contain a parsable `int`.  
Since:  
1.8  
* #### parseUnsignedInt  
public static int parseUnsignedInt([CharSequence](../../java/lang/CharSequence.html "interface in java.lang") s,  
                                   int beginIndex,  
                                   int endIndex,  
                                   int radix)  
                            throws [NumberFormatException](../../java/lang/NumberFormatException.html "class in java.lang")  
Parses the [CharSequence](../../java/lang/CharSequence.html "interface in java.lang") argument as an unsigned `int` in the specified `radix`, beginning at the specified`beginIndex` and extending to `endIndex - 1`.  
The method does not take steps to guard against the`CharSequence` being mutated while parsing.  
Parameters:  
`s` \- the `CharSequence` containing the unsigned`int` representation to be parsed  
`beginIndex` \- the beginning index, inclusive.  
`endIndex` \- the ending index, exclusive.  
`radix` \- the radix to be used while parsing `s`.  
Returns:  
the unsigned `int` represented by the subsequence in the specified radix.  
Throws:  
`[NullPointerException](../../java/lang/NullPointerException.html "class in java.lang")` \- if `s` is null.  
`[IndexOutOfBoundsException](../../java/lang/IndexOutOfBoundsException.html "class in java.lang")` \- if `beginIndex` is negative, or if `beginIndex` is greater than`endIndex` or if `endIndex` is greater than`s.length()`.  
`[NumberFormatException](../../java/lang/NumberFormatException.html "class in java.lang")` \- if the `CharSequence` does not contain a parsable unsigned `int` in the specified`radix`, or if `radix` is either smaller than[Character.MIN\_RADIX](../../java/lang/Character.html#MIN%5FRADIX) or larger than[Character.MAX\_RADIX](../../java/lang/Character.html#MAX%5FRADIX).  
Since:  
9  
* #### parseUnsignedInt  
public static int parseUnsignedInt([String](../../java/lang/String.html "class in java.lang") s)  
                            throws [NumberFormatException](../../java/lang/NumberFormatException.html "class in java.lang")  
Parses the string argument as an unsigned decimal integer. The characters in the string must all be decimal digits, except that the first character may be an ASCII plus sign ` '+'` (`'\u002B'`). The resulting integer value is returned, exactly as if the argument and the radix 10 were given as arguments to the [parseUnsignedInt(java.lang.String, int)](../../java/lang/Integer.html#parseUnsignedInt%28java.lang.String,int%29) method.  
Parameters:  
`s` \- a `String` containing the unsigned `int` representation to be parsed  
Returns:  
the unsigned integer value represented by the argument in decimal.  
Throws:  
`[NumberFormatException](../../java/lang/NumberFormatException.html "class in java.lang")` \- if the string does not contain a parsable unsigned integer.  
Since:  
1.8  
* #### valueOf  
public static [Integer](../../java/lang/Integer.html "class in java.lang") valueOf([String](../../java/lang/String.html "class in java.lang") s,  
                              int radix)  
                       throws [NumberFormatException](../../java/lang/NumberFormatException.html "class in java.lang")  
Returns an `Integer` object holding the value extracted from the specified `String` when parsed with the radix given by the second argument. The first argument is interpreted as representing a signed integer in the radix specified by the second argument, exactly as if the arguments were given to the [parseInt(java.lang.String, int)](../../java/lang/Integer.html#parseInt%28java.lang.String,int%29) method. The result is an `Integer` object that represents the integer value specified by the string.  
In other words, this method returns an `Integer` object equal to the value of:  
> `new Integer(Integer.parseInt(s, radix))`  
Parameters:  
`s` \- the string to be parsed.  
`radix` \- the radix to be used in interpreting `s`  
Returns:  
an `Integer` object holding the value represented by the string argument in the specified radix.  
Throws:  
`[NumberFormatException](../../java/lang/NumberFormatException.html "class in java.lang")` \- if the `String` does not contain a parsable `int`.  
* #### valueOf  
public static [Integer](../../java/lang/Integer.html "class in java.lang") valueOf([String](../../java/lang/String.html "class in java.lang") s)  
                       throws [NumberFormatException](../../java/lang/NumberFormatException.html "class in java.lang")  
Returns an `Integer` object holding the value of the specified `String`. The argument is interpreted as representing a signed decimal integer, exactly as if the argument were given to the [parseInt(java.lang.String)](../../java/lang/Integer.html#parseInt%28java.lang.String%29) method. The result is an`Integer` object that represents the integer value specified by the string.  
In other words, this method returns an `Integer` object equal to the value of:  
> `new Integer(Integer.parseInt(s))`  
Parameters:  
`s` \- the string to be parsed.  
Returns:  
an `Integer` object holding the value represented by the string argument.  
Throws:  
`[NumberFormatException](../../java/lang/NumberFormatException.html "class in java.lang")` \- if the string cannot be parsed as an integer.  
* #### valueOf  
public static [Integer](../../java/lang/Integer.html "class in java.lang") valueOf(int i)  
Returns an `Integer` instance representing the specified`int` value. If a new `Integer` instance is not required, this method should generally be used in preference to the constructor [Integer(int)](../../java/lang/Integer.html#%3Cinit%3E%28int%29), as this method is likely to yield significantly better space and time performance by caching frequently requested values. This method will always cache values in the range -128 to 127, inclusive, and may cache other values outside of this range.  
Parameters:  
`i` \- an `int` value.  
Returns:  
an `Integer` instance representing `i`.  
Since:  
1.5  
* #### byteValue  
public byte byteValue()  
Returns the value of this `Integer` as a `byte` after a narrowing primitive conversion.  
Overrides:  
`[byteValue](../../java/lang/Number.html#byteValue%28%29)` in class `[Number](../../java/lang/Number.html "class in java.lang")`  
Returns:  
the numeric value represented by this object after conversion to type `byte`.  
See The Java™ Language Specification:  
5.1.3 Narrowing Primitive Conversions  
* #### shortValue  
public short shortValue()  
Returns the value of this `Integer` as a `short` after a narrowing primitive conversion.  
Overrides:  
`[shortValue](../../java/lang/Number.html#shortValue%28%29)` in class `[Number](../../java/lang/Number.html "class in java.lang")`  
Returns:  
the numeric value represented by this object after conversion to type `short`.  
See The Java™ Language Specification:  
5.1.3 Narrowing Primitive Conversions  
* #### intValue  
public int intValue()  
Returns the value of this `Integer` as an`int`.  
Specified by:  
`[intValue](../../java/lang/Number.html#intValue%28%29)` in class `[Number](../../java/lang/Number.html "class in java.lang")`  
Returns:  
the numeric value represented by this object after conversion to type `int`.  
* #### longValue  
public long longValue()  
Returns the value of this `Integer` as a `long` after a widening primitive conversion.  
Specified by:  
`[longValue](../../java/lang/Number.html#longValue%28%29)` in class `[Number](../../java/lang/Number.html "class in java.lang")`  
Returns:  
the numeric value represented by this object after conversion to type `long`.  
See Also:  
[toUnsignedLong(int)](../../java/lang/Integer.html#toUnsignedLong%28int%29)  
See The Java™ Language Specification:  
5.1.2 Widening Primitive Conversions  
* #### floatValue  
public float floatValue()  
Returns the value of this `Integer` as a `float` after a widening primitive conversion.  
Specified by:  
`[floatValue](../../java/lang/Number.html#floatValue%28%29)` in class `[Number](../../java/lang/Number.html "class in java.lang")`  
Returns:  
the numeric value represented by this object after conversion to type `float`.  
See The Java™ Language Specification:  
5.1.2 Widening Primitive Conversions  
* #### doubleValue  
public double doubleValue()  
Returns the value of this `Integer` as a `double` after a widening primitive conversion.  
Specified by:  
`[doubleValue](../../java/lang/Number.html#doubleValue%28%29)` in class `[Number](../../java/lang/Number.html "class in java.lang")`  
Returns:  
the numeric value represented by this object after conversion to type `double`.  
See The Java™ Language Specification:  
5.1.2 Widening Primitive Conversions  
* #### toString  
public [String](../../java/lang/String.html "class in java.lang") toString()  
Returns a `String` object representing this`Integer`'s value. The value is converted to signed decimal representation and returned as a string, exactly as if the integer value were given as an argument to the [toString(int)](../../java/lang/Integer.html#toString%28int%29) method.  
Overrides:  
`[toString](../../java/lang/Object.html#toString%28%29)` in class `[Object](../../java/lang/Object.html "class in java.lang")`  
Returns:  
a string representation of the value of this object in base 10.  
* #### hashCode  
public int hashCode()  
Returns a hash code for this `Integer`.  
Overrides:  
`[hashCode](../../java/lang/Object.html#hashCode%28%29)` in class `[Object](../../java/lang/Object.html "class in java.lang")`  
Returns:  
a hash code value for this object, equal to the primitive `int` value represented by this`Integer` object.  
See Also:  
[Object.equals(java.lang.Object)](../../java/lang/Object.html#equals%28java.lang.Object%29), [System.identityHashCode(java.lang.Object)](../../java/lang/System.html#identityHashCode%28java.lang.Object%29)  
* #### hashCode  
public static int hashCode(int value)  
Returns a hash code for an `int` value; compatible with`Integer.hashCode()`.  
Parameters:  
`value` \- the value to hash  
Returns:  
a hash code value for an `int` value.  
Since:  
1.8  
* #### equals  
public boolean equals([Object](../../java/lang/Object.html "class in java.lang") obj)  
Compares this object to the specified object. The result is`true` if and only if the argument is not`null` and is an `Integer` object that contains the same `int` value as this object.  
Overrides:  
`[equals](../../java/lang/Object.html#equals%28java.lang.Object%29)` in class `[Object](../../java/lang/Object.html "class in java.lang")`  
Parameters:  
`obj` \- the object to compare with.  
Returns:  
`true` if the objects are the same;`false` otherwise.  
See Also:  
[Object.hashCode()](../../java/lang/Object.html#hashCode%28%29), [HashMap](../../java/util/HashMap.html "class in java.util")  
* #### getInteger  
public static [Integer](../../java/lang/Integer.html "class in java.lang") getInteger([String](../../java/lang/String.html "class in java.lang") nm)  
Determines the integer value of the system property with the specified name.  
The first argument is treated as the name of a system property. System properties are accessible through the [System.getProperty(java.lang.String)](../../java/lang/System.html#getProperty%28java.lang.String%29) method. The string value of this property is then interpreted as an integer value using the grammar supported by [decode](../../java/lang/Integer.html#decode%28java.lang.String%29) and an `Integer` object representing this value is returned.  
If there is no property with the specified name, if the specified name is empty or `null`, or if the property does not have the correct numeric format, then `null` is returned.  
In other words, this method returns an `Integer` object equal to the value of:  
> `getInteger(nm, null)`  
Parameters:  
`nm` \- property name.  
Returns:  
the `Integer` value of the property.  
Throws:  
`[SecurityException](../../java/lang/SecurityException.html "class in java.lang")` \- for the same reasons as[System.getProperty](../../java/lang/System.html#getProperty%28java.lang.String%29)  
See Also:  
[System.getProperty(java.lang.String)](../../java/lang/System.html#getProperty%28java.lang.String%29), [System.getProperty(java.lang.String, java.lang.String)](../../java/lang/System.html#getProperty%28java.lang.String,java.lang.String%29)  
* #### getInteger  
public static [Integer](../../java/lang/Integer.html "class in java.lang") getInteger([String](../../java/lang/String.html "class in java.lang") nm,  
                                 int val)  
Determines the integer value of the system property with the specified name.  
The first argument is treated as the name of a system property. System properties are accessible through the [System.getProperty(java.lang.String)](../../java/lang/System.html#getProperty%28java.lang.String%29) method. The string value of this property is then interpreted as an integer value using the grammar supported by [decode](../../java/lang/Integer.html#decode%28java.lang.String%29) and an `Integer` object representing this value is returned.  
The second argument is the default value. An `Integer` object that represents the value of the second argument is returned if there is no property of the specified name, if the property does not have the correct numeric format, or if the specified name is empty or`null`.  
In other words, this method returns an `Integer` object equal to the value of:  
> `getInteger(nm, new Integer(val))`  
 but in practice it may be implemented in a manner such as:  
> Integer result = getInteger(nm, null);  
> return (result == null) ? new Integer(val) : result;  
>  
 to avoid the unnecessary allocation of an `Integer` object when the default value is not needed.  
Parameters:  
`nm` \- property name.  
`val` \- default value.  
Returns:  
the `Integer` value of the property.  
Throws:  
`[SecurityException](../../java/lang/SecurityException.html "class in java.lang")` \- for the same reasons as[System.getProperty](../../java/lang/System.html#getProperty%28java.lang.String%29)  
See Also:  
[System.getProperty(java.lang.String)](../../java/lang/System.html#getProperty%28java.lang.String%29), [System.getProperty(java.lang.String, java.lang.String)](../../java/lang/System.html#getProperty%28java.lang.String,java.lang.String%29)  
* #### getInteger  
public static [Integer](../../java/lang/Integer.html "class in java.lang") getInteger([String](../../java/lang/String.html "class in java.lang") nm,  
                                 [Integer](../../java/lang/Integer.html "class in java.lang") val)  
Returns the integer value of the system property with the specified name. The first argument is treated as the name of a system property. System properties are accessible through the[System.getProperty(java.lang.String)](../../java/lang/System.html#getProperty%28java.lang.String%29) method. The string value of this property is then interpreted as an integer value, as per the [decode](../../java/lang/Integer.html#decode%28java.lang.String%29) method, and an `Integer` object representing this value is returned; in summary:  
         * If the property value begins with the two ASCII characters`0x` or the ASCII character `#`, not followed by a minus sign, then the rest of it is parsed as a hexadecimal integer exactly as by the method[valueOf(java.lang.String, int)](../../java/lang/Integer.html#valueOf%28java.lang.String,int%29) with radix 16.  
         * If the property value begins with the ASCII character`0` followed by another character, it is parsed as an octal integer exactly as by the method[valueOf(java.lang.String, int)](../../java/lang/Integer.html#valueOf%28java.lang.String,int%29) with radix 8.  
         * Otherwise, the property value is parsed as a decimal integer exactly as by the method [valueOf(java.lang.String, int)](../../java/lang/Integer.html#valueOf%28java.lang.String,int%29) with radix 10.  
The second argument is the default value. The default value is returned if there is no property of the specified name, if the property does not have the correct numeric format, or if the specified name is empty or `null`.  
Parameters:  
`nm` \- property name.  
`val` \- default value.  
Returns:  
the `Integer` value of the property.  
Throws:  
`[SecurityException](../../java/lang/SecurityException.html "class in java.lang")` \- for the same reasons as[System.getProperty](../../java/lang/System.html#getProperty%28java.lang.String%29)  
See Also:  
[System.getProperty(java.lang.String)](../../java/lang/System.html#getProperty%28java.lang.String%29), [System.getProperty(java.lang.String, java.lang.String)](../../java/lang/System.html#getProperty%28java.lang.String,java.lang.String%29)  
* #### decode  
public static [Integer](../../java/lang/Integer.html "class in java.lang") decode([String](../../java/lang/String.html "class in java.lang") nm)  
                      throws [NumberFormatException](../../java/lang/NumberFormatException.html "class in java.lang")  
Decodes a `String` into an `Integer`. Accepts decimal, hexadecimal, and octal numbers given by the following grammar:  
> _DecodableString:_  
>  
> _Signopt DecimalNumeral_  
>  
> _Signopt_ `0x` _HexDigits_  
>  
> _Signopt_ `0X` _HexDigits_  
>  
> _Signopt_ `#` _HexDigits_  
>  
> _Signopt_ `0` _OctalDigits_  
>  
> _Sign:_  
>  
> `-`  
>  
> `+`  
_DecimalNumeral_, _HexDigits_, and _OctalDigits_ are as defined in section 3.10.1 ofThe Java™ Language Specification, except that underscores are not accepted between digits.  
The sequence of characters following an optional sign and/or radix specifier ("`0x`", "`0X`", "`#`", or leading zero) is parsed as by the ` Integer.parseInt` method with the indicated radix (10, 16, or 8). This sequence of characters must represent a positive value or a [NumberFormatException](../../java/lang/NumberFormatException.html "class in java.lang") will be thrown. The result is negated if first character of the specified ` String` is the minus sign. No whitespace characters are permitted in the `String`.  
Parameters:  
`nm` \- the `String` to decode.  
Returns:  
an `Integer` object holding the `int` value represented by `nm`  
Throws:  
`[NumberFormatException](../../java/lang/NumberFormatException.html "class in java.lang")` \- if the `String` does not contain a parsable integer.  
See Also:  
[parseInt(java.lang.String, int)](../../java/lang/Integer.html#parseInt%28java.lang.String,int%29)  
* #### compareTo  
public int compareTo([Integer](../../java/lang/Integer.html "class in java.lang") anotherInteger)  
Compares two `Integer` objects numerically.  
Specified by:  
`[compareTo](../../java/lang/Comparable.html#compareTo%28T%29)` in interface `[Comparable](../../java/lang/Comparable.html "interface in java.lang")<[Integer](../../java/lang/Integer.html "class in java.lang")>`  
Parameters:  
`anotherInteger` \- the `Integer` to be compared.  
Returns:  
the value `0` if this `Integer` is equal to the argument `Integer`; a value less than`0` if this `Integer` is numerically less than the argument `Integer`; and a value greater than `0` if this `Integer` is numerically greater than the argument `Integer` (signed comparison).  
Since:  
1.2  
* #### compare  
public static int compare(int x,  
                          int y)  
Compares two `int` values numerically. The value returned is identical to what would be returned by:  
    Integer.valueOf(x).compareTo(Integer.valueOf(y))  
       
Parameters:  
`x` \- the first `int` to compare  
`y` \- the second `int` to compare  
Returns:  
the value `0` if `x == y`; a value less than `0` if `x < y`; and a value greater than `0` if `x > y`  
Since:  
1.7  
* #### compareUnsigned  
public static int compareUnsigned(int x,  
                                  int y)  
Compares two `int` values numerically treating the values as unsigned.  
Parameters:  
`x` \- the first `int` to compare  
`y` \- the second `int` to compare  
Returns:  
the value `0` if `x == y`; a value less than `0` if `x < y` as unsigned values; and a value greater than `0` if `x > y` as unsigned values  
Since:  
1.8  
* #### toUnsignedLong  
public static long toUnsignedLong(int x)  
Converts the argument to a `long` by an unsigned conversion. In an unsigned conversion to a `long`, the high-order 32 bits of the `long` are zero and the low-order 32 bits are equal to the bits of the integer argument. Consequently, zero and positive `int` values are mapped to a numerically equal `long` value and negative ` int` values are mapped to a `long` value equal to the input plus 232.  
Parameters:  
`x` \- the value to convert to an unsigned `long`  
Returns:  
the argument converted to `long` by an unsigned conversion  
Since:  
1.8  
* #### divideUnsigned  
public static int divideUnsigned(int dividend,  
                                 int divisor)  
Returns the unsigned quotient of dividing the first argument by the second where each argument and the result is interpreted as an unsigned value.  
Note that in two's complement arithmetic, the three other basic arithmetic operations of add, subtract, and multiply are bit-wise identical if the two operands are regarded as both being signed or both being unsigned. Therefore separate ` addUnsigned`, etc. methods are not provided.  
Parameters:  
`dividend` \- the value to be divided  
`divisor` \- the value doing the dividing  
Returns:  
the unsigned quotient of the first argument divided by the second argument  
Since:  
1.8  
See Also:  
[remainderUnsigned(int, int)](../../java/lang/Integer.html#remainderUnsigned%28int,int%29)  
* #### remainderUnsigned  
public static int remainderUnsigned(int dividend,  
                                    int divisor)  
Returns the unsigned remainder from dividing the first argument by the second where each argument and the result is interpreted as an unsigned value.  
Parameters:  
`dividend` \- the value to be divided  
`divisor` \- the value doing the dividing  
Returns:  
the unsigned remainder of the first argument divided by the second argument  
Since:  
1.8  
See Also:  
[divideUnsigned(int, int)](../../java/lang/Integer.html#divideUnsigned%28int,int%29)  
* #### highestOneBit  
public 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 in the specified`int` value. Returns zero if the specified value has no one-bits in its two's complement binary representation, that is, if it is equal to zero.  
Parameters:  
`i` \- the value whose highest one bit is to be computed  
Returns:  
an `int` value with a single one-bit, in the position of the highest-order one-bit in the specified value, or zero if the specified value is itself equal to zero.  
Since:  
1.5  
* #### lowestOneBit  
public 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 in the specified`int` value. Returns zero if the specified value has no one-bits in its two's complement binary representation, that is, if it is equal to zero.  
Parameters:  
`i` \- the value whose lowest one bit is to be computed  
Returns:  
an `int` value with a single one-bit, in the position of the lowest-order one-bit in the specified value, or zero if the specified value is itself equal to zero.  
Since:  
1.5  
* #### numberOfLeadingZeros  
public static int numberOfLeadingZeros(int i)  
Returns the number of zero bits preceding the highest-order ("leftmost") one-bit in the two's complement binary representation of the specified `int` value. Returns 32 if the specified value has no one-bits in its two's complement representation, in other words if it is equal to zero.  
Note that this method is closely related to the logarithm base 2\. For all positive `int` values x:  
         * floor(log2(x)) = `31 - numberOfLeadingZeros(x)`  
         * ceil(log2(x)) = `32 - numberOfLeadingZeros(x - 1)`  
Parameters:  
`i` \- the value whose number of leading zeros is to be computed  
Returns:  
the number of zero bits preceding the highest-order ("leftmost") one-bit in the two's complement binary representation of the specified `int` value, or 32 if the value is equal to zero.  
Since:  
1.5  
* #### numberOfTrailingZeros  
public static int numberOfTrailingZeros(int i)  
Returns the number of zero bits following the lowest-order ("rightmost") one-bit in the two's complement binary representation of the specified`int` value. Returns 32 if the specified value has no one-bits in its two's complement representation, in other words if it is equal to zero.  
Parameters:  
`i` \- the value whose number of trailing zeros is to be computed  
Returns:  
the number of zero bits following the lowest-order ("rightmost") one-bit in the two's complement binary representation of the specified `int` value, or 32 if the value is equal to zero.  
Since:  
1.5  
* #### bitCount  
public static int bitCount(int i)  
Returns the number of one-bits in the two's complement binary representation of the specified `int` value. This function is sometimes referred to as the _population count_.  
Parameters:  
`i` \- the value whose bits are to be counted  
Returns:  
the number of one-bits in the two's complement binary representation of the specified `int` value.  
Since:  
1.5  
* #### rotateLeft  
public static int rotateLeft(int i,  
                             int distance)  
Returns the value obtained by rotating the two's complement binary representation of the specified `int` value left by the specified number of bits. (Bits shifted out of the left hand, or high-order, side reenter on the right, or low-order.)  
Note that left rotation with a negative distance is equivalent to right rotation: `rotateLeft(val, -distance) == rotateRight(val, distance)`. Note also that rotation by any multiple of 32 is a no-op, so all but the last five bits of the rotation distance can be ignored, even if the distance is negative: `rotateLeft(val, distance) == rotateLeft(val, distance & 0x1F)`.  
Parameters:  
`i` \- the value whose bits are to be rotated left  
`distance` \- the number of bit positions to rotate left  
Returns:  
the value obtained by rotating the two's complement binary representation of the specified `int` value left by the specified number of bits.  
Since:  
1.5  
* #### rotateRight  
public static int rotateRight(int i,  
                              int distance)  
Returns the value obtained by rotating the two's complement binary representation of the specified `int` value right by the specified number of bits. (Bits shifted out of the right hand, or low-order, side reenter on the left, or high-order.)  
Note that right rotation with a negative distance is equivalent to left rotation: `rotateRight(val, -distance) == rotateLeft(val, distance)`. Note also that rotation by any multiple of 32 is a no-op, so all but the last five bits of the rotation distance can be ignored, even if the distance is negative: `rotateRight(val, distance) == rotateRight(val, distance & 0x1F)`.  
Parameters:  
`i` \- the value whose bits are to be rotated right  
`distance` \- the number of bit positions to rotate right  
Returns:  
the value obtained by rotating the two's complement binary representation of the specified `int` value right by the specified number of bits.  
Since:  
1.5  
* #### reverse  
public static int reverse(int i)  
Returns the value obtained by reversing the order of the bits in the two's complement binary representation of the specified `int` value.  
Parameters:  
`i` \- the value to be reversed  
Returns:  
the value obtained by reversing order of the bits in the specified `int` value.  
Since:  
1.5  
* #### signum  
public static int signum(int i)  
Returns the signum function of the specified `int` value. (The return value is -1 if the specified value is negative; 0 if the specified value is zero; and 1 if the specified value is positive.)  
Parameters:  
`i` \- the value whose signum is to be computed  
Returns:  
the signum function of the specified `int` value.  
Since:  
1.5  
* #### reverseBytes  
public static int reverseBytes(int i)  
Returns the value obtained by reversing the order of the bytes in the two's complement representation of the specified `int` value.  
Parameters:  
`i` \- the value whose bytes are to be reversed  
Returns:  
the value obtained by reversing the bytes in the specified`int` value.  
Since:  
1.5  
* #### sum  
public static int sum(int a,  
                      int b)  
Adds two integers together as per the + operator.  
Parameters:  
`a` \- the first operand  
`b` \- the second operand  
Returns:  
the sum of `a` and `b`  
Since:  
1.8  
See Also:  
[BinaryOperator](../../java/util/function/BinaryOperator.html "interface in java.util.function")  
* #### max  
public static int max(int a,  
                      int b)  
Returns the greater of two `int` values as if by calling [Math.max](../../java/lang/Math.html#max%28int,int%29).  
Parameters:  
`a` \- the first operand  
`b` \- the second operand  
Returns:  
the greater of `a` and `b`  
Since:  
1.8  
See Also:  
[BinaryOperator](../../java/util/function/BinaryOperator.html "interface in java.util.function")  
* #### min  
public static int min(int a,  
                      int b)  
Returns the smaller of two `int` values as if by calling [Math.min](../../java/lang/Math.html#min%28int,int%29).  
Parameters:  
`a` \- the first operand  
`b` \- the second operand  
Returns:  
the smaller of `a` and `b`  
Since:  
1.8  
See Also:  
[BinaryOperator](../../java/util/function/BinaryOperator.html "interface in java.util.function")

Integer (Java SE 10 & JDK 10 ) (original) (raw)

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