Integer JDK 1.6)

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publicstatic int bitCount (int i)

Returns the number of one-bits in the two's complement binary representation of the specified int value.

public byte byteValue () [Overrides Number]

Returns the value of this Integer as a byte.

public int compareTo (Integer anotherInteger)

Compares two Integer objects numerically.

Compares two Integer objects numerically.
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).
Parameters:
- anotherInteger - the Integer to be compared.
Since: 1.2

publicstatic Integer decode (String nm) throws NumberFormatException

Decodes a String into an Integer.

Decodes a String into an Integer. Accepts decimal, hexadecimal, and octal numbers given by the following grammar:

DecodableString:
Sign_opt DecimalNumeral
Sign_opt 0x HexDigits
Sign_opt 0X HexDigits
Sign_opt # HexDigits
Sign_opt 0 OctalDigits

Sign:
-

DecimalNumeral, HexDigits, and OctalDigits are defined in §3.10.1 of the Java Language Specification.

The sequence of characters following an (optional) negative 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 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.
Returns: a Integer object holding the int value represented by nm
Parameters:
- nm - the String to decode.
Throws:
- NumberFormatException - if the String does not contain a parsable integer.
See Also: Integer.parseInt(java.lang.String, int),

public double doubleValue () [Specified in Number]

Returns the value of this Integer as a double.

public boolean equals (Object obj)

Compares this object to the specified object.

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.
Returns: true if the objects are the same; false otherwise.
Parameters:
- obj - the object to compare with.

public float floatValue () [Specified in Number]

Returns the value of this Integer as a float.

pack-privatestatic void getChars (int i, int index, char[] buf)

Places characters representing the integer i into the character array buf.

publicstatic Integer getInteger (String 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) method. The string value of this property is then interpreted as an integer value and an Integer object representing this value is returned. Details of possible numeric formats can be found with the definition of getProperty.

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)

Returns: the Integer value of the property.
Parameters:
- nm - property name.
See Also: System.getProperty(java.lang.String), System.getProperty(java.lang.String, java.lang.String),

publicstatic Integer getInteger (String 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) method. The string value of this property is then interpreted as an integer value and an Integer object representing this value is returned. Details of possible numeric formats can be found with the definition of getProperty.

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.
Returns: the Integer value of the property.
Parameters:
- nm - property name.
- val - default value.
See Also: System.getProperty(java.lang.String), System.getProperty(java.lang.String, java.lang.String),

publicstatic Integer getInteger (String nm, Integer val)

Returns the integer value of the system property with the specified name.

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) method. The string value of this property is then interpreted as an integer value, as per the Integer.decode method, and an Integer object representing this value is returned.

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 Integer.valueOf(java.lang.String, int) 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 Integer.valueOf(java.lang.String, int) with radix 8.
Otherwise, the property value is parsed as a decimal integer exactly as by the method Integer.valueOf(java.lang.String, int) 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.
Returns: the Integer value of the property.
Parameters:
- nm - property name.
- val - default value.
See Also: System.getProperty(java.lang.String), System.getProperty(java.lang.String, java.lang.String), Integer.decode(java.lang.String),

public int hashCode ()

Returns a hash code for this Integer.

Returns a hash code for this Integer.
Returns: a hash code value for this object, equal to the primitive int value represented by this Integer object.

publicstatic 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.

public int intValue () [Specified in Number]

Returns the value of this Integer as an int.

public long longValue () [Specified in Number]

Returns the value of this Integer as a long.

publicstatic 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.

publicstatic 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.

publicstatic 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.

publicstatic int parseInt (String s) throws NumberFormatException

Parses the string argument as a signed decimal integer.

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. The resulting
integer value is returned, exactly as if the argument and the radix
10 were given as arguments to the
Integer.parseInt(java.lang.String, int) method.
Returns: the integer value represented by the argument in decimal.
Parameters:
- s - a String containing the int representation to be parsed
Throws:
- NumberFormatException - if the string does not contain a parsable integer.

publicstatic int parseInt (String s, int radix) throws NumberFormatException

Parses the string argument as a signed integer in the radix specified by the second argument.

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) returns a nonnegative value), except that the first character may be an ASCII minus sign '-' ('\u002D') to indicate a negative 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 or larger than Character.MAX_RADIX.
Any character of the string is not a digit of the specified radix, except that the first character may be a minus sign '-' ('\u002D') 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("-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

Returns: the integer represented by the string argument in the specified radix.
Parameters:
- s - the String containing the integer representation to be parsed
- radix - the radix to be used while parsing s.
Throws:
- NumberFormatException - if the String does not contain a parsable int.

publicstatic 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.

publicstatic 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.

publicstatic 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.

publicstatic 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.

public short shortValue () [Overrides Number]

Returns the value of this Integer as a short.

publicstatic int signum (int i)

Returns the signum function of the specified int value.

pack-privatestatic int stringSize (int x)

publicstatic String toBinaryString (int i)

Returns a string representation of the integer argument as an unsigned integer in base 2.

publicstatic String 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 0s. 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() method may be called on the result:

 Integer.toHexString(n).toUpperCase()

Returns: the string representation of the unsigned integer value represented by the argument in hexadecimal (base 16).
Parameters:
- i - an integer to be converted to a string.
Since: JDK1.0.2

publicstatic String 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 0s.

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'.
Returns: the string representation of the unsigned integer value represented by the argument in octal (base 8).
Parameters:
- i - an integer to be converted to a string.
Since: JDK1.0.2

public String toString ()

Returns a String object representing this Integer's value.

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 Integer.toString(int) method.
Returns: a string representation of the value of this object in base 10.

publicstatic String toString (int i)

Returns a String object representing the specified integer.

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 Integer.toString(int, int) method.
Returns: a string representation of the argument in base 10.
Parameters:
- i - an integer to be converted.

publicstatic String 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 is N, 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() method may be called on the result:

 Integer.toString(n, 16).toUpperCase()

Returns: a string representation of the argument in the specified radix.
Parameters:
- i - an integer to be converted to a string.
- radix - the radix to use in the string representation.
See Also: Character.MAX_RADIX, Character.MIN_RADIX,

publicstatic Integer valueOf (int i)

Returns a Integer instance representing the specified int value.

Returns a 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.Integer(int), as this method is likely to yield
significantly better space and time performance by caching
frequently requested values.
Returns: a Integer instance representing i.
Parameters:
- i - an int value.
Since: 1.5

publicstatic Integer valueOf (String s) throws NumberFormatException

Returns an Integer object holding the value of the specified String.

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 Integer.parseInt(java.lang.String) 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))

Returns: an Integer object holding the value represented by the string argument.
Parameters:
- s - the string to be parsed.
Throws:
- NumberFormatException - if the string cannot be parsed as an integer.

publicstatic Integer valueOf (String s, int radix) throws NumberFormatException

Returns an Integer object holding the value extracted from the specified String when parsed with the radix given by the second argument.

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 Integer.parseInt(java.lang.String, int) 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))

Returns: an Integer object holding the value represented by the string argument in the specified radix.
Parameters:
- s - the string to be parsed.
- radix - the radix to be used in interpreting s
Throws:
- NumberFormatException - if the String does not contain a parsable int.