java.lang
Class Integer

java.lang.Object
  java.lang.Integer

public final class Integer
extends 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. In addition, this class provides several methods for converting an int to a String and a String to an int, as well as other constants and methods useful when dealing with an int.

Field Summary

static int	MAX_VALUE The largest value of type int.
static int	MIN_VALUE The smallest value of type int.

Constructor Summary

Integer(int value)
Constructs a newly allocated Integer object that represents the primitive int argument.

Method Summary

byte	byteValue() Returns the value of this Integer as a byte.
double	doubleValue() Returns the value of this Integer as a double.
boolean	equals(Object obj) Compares this object to the specified object.
float	floatValue() Returns the value of this Integer as a float.
int	hashCode() Returns a hashcode for this Integer.
int	intValue() Returns the value of this Integer as an int.
long	longValue() Returns the value of this Integer as a long.
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.
short	shortValue() Returns the value of this Integer as a short.
static String	toBinaryString(int i) Creates a string representation of the integer argument as an unsigned integer in base 2.
static String	toHexString(int i) Creates a string representation of the integer argument as an unsigned integer in base 16.
static String	toOctalString(int i) Creates a string representation of the integer argument as an unsigned integer in base 8.
String	toString() Returns a String object representing this Integer's value.
static String	toString(int i) Returns a new String object representing the specified integer.
static String	toString(int i, int radix) Creates a string representation of the first argument in the radix specified by the second argument.
static Integer	valueOf(String s) Returns a new Integer object initialized to the value of the specified String.
static Integer	valueOf(String s, int radix) Returns a new Integer object initialized to the value of the specified String.

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Field Detail

MIN_VALUE

public static final int MIN_VALUE

The smallest value of type int. The constant value of this field is -2147483648.

See Also:

Constant Field Values

MAX_VALUE

public static final int MAX_VALUE

The largest value of type int. The constant value of this field is 2147483647.

See Also:

Constant Field Values

Constructor Detail

Integer

public Integer(int value)

Constructs a newly allocated Integer object that represents the primitive int argument.

Method Detail

byteValue

public byte byteValue()

Returns the value of this Integer as a byte.

doubleValue

public double doubleValue()

Returns the value of this Integer as a double.

equals

public boolean equals(Object 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 in class Object

Parameters:

obj - the reference object with which to compare.

Returns:

true if this object is the same as the obj argument; false otherwise.

floatValue

public float floatValue()

Returns the value of this Integer as a float.

hashCode

public int hashCode()

Returns a hashcode for this Integer.

Overrides:

hashCode in class Object

intValue

public int intValue()

Returns the value of this Integer as an int.

longValue

public long longValue()

Returns the value of this Integer as a long.

parseInt

public static int parseInt(String s)
                    throws NumberFormatException

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 '-' ('-') 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 parseInt(java.lang.String, int) method.

Throws:

NumberFormatException

parseInt

public static int parseInt(String s,
                           int radix)
                    throws NumberFormatException

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 '-' ('-') 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 '-' ('-') provided that the string is longer than length 1. The integer 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

Throws:

NumberFormatException

shortValue

public short shortValue()

Returns the value of this Integer as a short.

toBinaryString

public static String toBinaryString(int i)

Creates a string representation of the integer argument as an unsigned integer in base 2. The unsigned integer value is the argument plus 232if 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 0s. If the unsigned magnitude is zero, it is represented by a single zero character '0' ('0'); otherwise, the first character of the representation of the unsigned magnitude will not be the zero character. The characters '0' ('0') and '1' ('1') are used as binary digits.

toHexString

public static String toHexString(int i)

Creates a string representation of the integer argument as an unsigned integer in base 16. The unsigned integer value is the argument plus 2pow32 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' ('0'); 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 '0' through '9' and 'u\0039' through 'f'.

toOctalString

public static String toOctalString(int i)

Creates 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' ('0'); otherwise, the first character of the representation of the unsigned magnitude will not be the zero character. The octal digits are: 01234567 These are the characters '0' through '7'.

toString

public String 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) method.

Overrides:

toString in class Object

toString

public static String toString(int i)

Returns a new 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) method.

toString

public static String toString(int i,
                              int radix)

Creates 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 '-' ('-'). 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' ('0'); 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 '0' through '9' and 'a' through 'z'. If the 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.

valueOf

public static Integer valueOf(String s)
                       throws NumberFormatException

Returns a new Integer object initialized to 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) 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))

Throws:

NumberFormatException

valueOf

public static Integer valueOf(String s,
                              int radix)
                       throws NumberFormatException

Returns a new Integer object initialized to the value of the specified String. 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) 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))

Throws:

NumberFormatException