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 is a wrapper for integer values. In Java, integers are not objects and most of the Java utility classes require the use of objects. Thus, if you needed to store an integer in a hashtable, you would have to "wrap" an Integer instance around it.

Version:: 1.26, 10/04/95
Author:: Lee Boynton, Arthur van Hoff

MAX_VALUE: The maximum value an Integer can have.
MIN_VALUE: The minimum value an Integer can have.

Integer(int): Constructs an Integer object initialized to the specified int value.
Integer(String): Constructs an Integer object initialized to the value specified by the String parameter.

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): Gets an Integer property.
getInteger(String, int): Gets an Integer property.
getInteger(String, Integer): Gets an Integer property.
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, int): Assuming the specified String represents an integer, returns that integer's value.
parseInt(String): Assuming the specified String represents an integer, returns that integer's value.
toString(int, int): Returns a new String object representing the specified integer in the specified radix.
toString(int): Returns a new String object representing the specified integer.
toString(): Returns a String object representing this Integer's value.
valueOf(String, int): Assuming the specified String represents an integer, returns a new Integer object initialized to that value.
valueOf(String): Assuming the specified String represents an integer, returns a new Integer object initialized to that value.

MIN_VALUE

  public final static int MIN_VALUE

The minimum value an Integer can have. The lowest minimum value an Integer can have is 0x80000000.

MAX_VALUE

  public final static int MAX_VALUE

The maximum value an Integer can have. The greatest maximum value an Integer can have is 0x7fffffff.

Integer

  public Integer(int value)

Constructs an Integer object initialized to the specified int value.

Parameters:: value - the initial value of the Integer

Integer

  public Integer(String s) throws NumberFormatException

Constructs an Integer object initialized to the value specified by the String parameter. The radix is assumed to be 10.

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

toString

  public static String toString(int i,
                                int radix)

Returns a new String object representing the specified integer in the specified radix.

Parameters:: i - the integer to be converted; radix - the radix
See Also:: MIN_RADIX, MAX_RADIX

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 - the integer to be converted

parseInt

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

Assuming the specified String represents an integer, returns that integer's value. Throws an exception if the String cannot be parsed as an int.

Parameters:: s - the String containing the integer; radix - the radix to be used
Throws: NumberFormatException: If the String does not contain a parsable integer.

parseInt

  public static int parseInt(String s) throws NumberFormatException

Assuming the specified String represents an integer, returns that integer's value. Throws an exception if the String cannot be parsed as an int. The radix is assumed to be 10.

Parameters:: s - the String containing the integer
Throws: NumberFormatException: If the string does not contain a parsable integer.

valueOf

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

Assuming the specified String represents an integer, returns a new Integer object initialized to that value. Throws an exception if the String cannot be parsed as an int.

Parameters:: s - the String containing the integer; radix - the radix to be used
Throws: NumberFormatException: If the String does not contain a parsable integer.

valueOf

  public static Integer valueOf(String s) throws NumberFormatException

Assuming the specified String represents an integer, returns a new Integer object initialized to that value. Throws an exception if the String cannot be parsed as an int. The radix is assumed to be 10.

Parameters:: s - the String containing the integer
Throws: NumberFormatException: If the String does not contain a parsable integer.

intValue

  public int intValue()

Returns the value of this Integer as an int.

Overrides:: intValue in class Number

longValue

  public long longValue()

Returns the value of this Integer as a long.

Overrides:: longValue in class Number

floatValue

  public float floatValue()

Returns the value of this Integer as a float.

Overrides:: floatValue in class Number

doubleValue

  public double doubleValue()

Returns the value of this Integer as a double.

Overrides:: doubleValue in class Number

toString

  public String toString()

Returns a String object representing this Integer's value.

Overrides:: toString in class Object

hashCode

  public int hashCode()

Returns a hashcode for this Integer.

Overrides:: hashCode in class Object

equals

  public boolean equals(Object obj)

Compares this object to the specified 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)

Gets an Integer property. If the property does not exist, it will return 0.

Parameters:: nm - the property name

getInteger

  public static Integer getInteger(String nm,
                                   int val)

Gets an Integer property. If the property does not exist, it will return val. Deals with Hexadecimal and octal numbers.

Parameters:: nm - the String name; val - the Integer value

getInteger

  public static Integer getInteger(String nm,
                                   Integer val)

Gets an Integer property. If the property does not exist, it will return val. Deals with Hexadecimal and octal numbers.

Parameters:: nm - the property name; val - the integer value

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