Class java.lang.Integer





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Class java.lang.Integer


java.lang.Object
|
+----java.lang.Number
|
+----java.lang.Integer



public final class Integer
extends Number

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.








MAX_VALUE
The largest value of type int.

MIN_VALUE
The smallest value of type int.

TYPE
The Class object representing the primitive type int.






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

Integer(String)
Constructs a newly allocated Integer object that
represents the value represented by the string.






byteValue()
Returns the value of this Integer as a byte.

decode(String)
Decodes a string into an Integer.

doubleValue()
Returns the value of this Integer as a double.

equals(Object)
Compares this object to the specified object.

floatValue()
Returns the value of this Integer as a float.

getInteger(String)
Determines the integer value of the system property with the
specified name.

getInteger(String, int)
Determines the integer value of the system property with the
specified name.

getInteger(String, Integer)
Determines the integer value of the system property with the
specified name.

hashCode()
Returns a hashcode for this Integer.

intValue()
Returns the value of this Integer as an int.

longValue()
Returns the value of this Integer as a long.

parseInt(String)
Parses the string argument as a signed decimal integer.

parseInt(String, int)
Parses the string argument as a signed integer in the radix
specified by the second argument.

shortValue()
Returns the value of this Integer as a short.

toBinaryString(int)
Creates a string representation of the integer argument as an
unsigned integer in base 2.

toHexString(int)
Creates a string representation of the integer argument as an
unsigned integer in base 16.

toOctalString(int)
Creates a string representation of the integer argument as an
unsigned integer in base 8.

toString()
Returns a String object representing this Integer's value.

toString(int)
Returns a new String object representing the specified integer.

toString(int, int)
Creates a string representation of the first argument in the
radix specified by the second argument.

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

valueOf(String, int)
Returns a new Integer object initialized to the value of the
specified String.






MIN_VALUE

public static final int MIN_VALUE


The smallest value of type int.


MAX_VALUE

public static final int MAX_VALUE


The largest value of type int.


TYPE

public static final Class TYPE


The Class object representing the primitive type int.







Integer

public Integer(int value)


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


Parameters:
value - the value to be represented by the Integer.



Integer

public Integer(String s) throws NumberFormatException


Constructs a newly allocated Integer object that
represents the value represented by the string. The string is
converted to an int value as if by the valueOf method.


Parameters:
s - the String to be converted to an
Integer.
Throws: NumberFormatException
if the String does not
contain a parsable integer.
See Also:
valueOf







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 following ASCII characters are used as digits:

0123456789abcdefghijklmnopqrstuvwxyz



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



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 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.


Parameters:
i - an integer.
Returns:
the string representation of the unsigned integer value
represented by the argument in hexadecimal (base 16).



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.


Parameters:
i - an integer
Returns:
the string representation of the unsigned integer value
represented by the argument in octal (base&mnsp;8).



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.


Parameters:
i - an integer.
Returns:
the string representation of the unsigned integer value
represented by the argument in binary (base 2).



toString

public static String toString(int i)


Returns a new String object representing the specified integer. The radix
is assumed to be 10.


Parameters:
i - an integer to be converted.
Returns:
a string representation of the argument in base 10.



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 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.


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



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.


Parameters:
s - a string.
Returns:
the integer represented by the argument in decimal.
Throws: NumberFormatException
if the string does not contain a
parsable integer.



valueOf

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


Returns a new Integer object initialized to the value of the
specified String. Throws an exception if the String cannot be
parsed as an int.


Parameters:
s - the string to be parsed.
Returns:
a newly constructed Integer initialized to the
value represented by the string argument in the specified
radix.
Throws: NumberFormatException
if the String does not
contain a parsable integer.



valueOf

public static Integer valueOf(String s) throws NumberFormatException


Returns a new Integer object initialized to the value of the
specified String. Throws an exception if the String cannot be
parsed as an int. The radix is assumed to be 10.


Parameters:
s - the string to be parsed.
Returns:
a newly constructed Integer initialized to the
value represented by the string argument.
Throws: NumberFormatException
if the string does not contain a
parsable integer.



byteValue

public byte byteValue()


Returns the value of this Integer as a byte.


Overrides:
byteValue in class Number



shortValue

public short shortValue()


Returns the value of this Integer as a short.


Overrides:
shortValue in class Number



intValue

public int intValue()


Returns the value of this Integer as an int.


Returns:
the int value represented by this object.
Overrides:
intValue in class Number



longValue

public long longValue()


Returns the value of this Integer as a long.


Returns:
the int value represented by this object that is
converted to type long and the result of the
conversion is returned.
Overrides:
longValue in class Number



floatValue

public float floatValue()


Returns the value of this Integer as a float.


Returns:
the int value represented by this object is
converted to type float and the result of the
conversion is returned.
Overrides:
floatValue in class Number



doubleValue

public double doubleValue()


Returns the value of this Integer as a double.


Returns:
the int value represented by this object is
converted to type double and the result of the
conversion is returned.
Overrides:
doubleValue in class Number



toString

public String toString()


Returns a String object representing this Integer's value.


Returns:
a string representation of the value of this object in
base 10.
Overrides:
toString in class Object



hashCode

public int hashCode()


Returns a hashcode for this Integer.


Returns:
a hash code value for this object.
Overrides:
hashCode in class Object



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.


Parameters:
obj - the object to compare with.
Returns:
true if the objects are the same;
false otherwise.
Overrides:
equals in class Object



getInteger

public static 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 getProperty
and , a method defined by the System class. 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, or if the
property does not have the correct numeric format, then
null is returned.


Parameters:
nm - property name.
Returns:
the Integer value of the property.
See Also:
getProperty, getProperty



getInteger

public static 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 getProperty
and , a method defined by the System class. 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, or if the
property does not have the correct numeric format, then an
Integer object that represents the value of the
second argument is returned.


Parameters:
nm - property name.
val - default value.
Returns:
the Integer value of the property.
See Also:
getProperty, getProperty



getInteger

public static Integer getInteger(String nm,
Integer 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 getProperty
and , a method defined by the System class. The
string value of this property is then interpreted as an integer
value and an Integer object representing this value is
returned.

If the property value begins with "0x" or
"#", not followed by a minus sign, the rest
of it is parsed as a hexadecimal integer exactly as for the method
Integer.valueOf with radix 16.

If the property value begins with "0" then
it is parsed as an octal integer exactly as for the method
Integer.valueOf with radix 8.

Otherwise the property value is parsed as a decimal integer
exactly as for the method Integer.valueOf with radix 10.

The second argument is the default value. If there is no property
of the specified name, or if the property does not have the
correct numeric format, then the second argument is returned.


Parameters:
nm - property name.
val - default value.
Returns:
the Integer value of the property.
See Also:
getProperty, getProperty



decode

public static Integer decode(String nm) throws NumberFormatException


Decodes a string into an Integer. Deals with decimal, hexadecimal,
and octal numbers.


Parameters:
nm - the string to decode




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