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.

Variable Index

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

Constructor Index

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

Method Index

o doubleValue()
Returns the value of this Integer as a double.
o equals(Object)
Compares this object to the specified object.
o floatValue()
Returns the value of this Integer as a float.
o getInteger(String)
Gets an Integer property.
o getInteger(String, int)
Gets an Integer property.
o getInteger(String, Integer)
Gets an Integer property.
o hashCode()
Returns a hashcode for this Integer.
o intValue()
Returns the value of this Integer as an int.
o longValue()
Returns the value of this Integer as a long.
o parseInt(String)
Assuming the specified String represents an integer, returns that integer's value.
o parseInt(String, int)
Assuming the specified String represents an integer, returns that integer's value.
o toBinaryString(int)
Returns a new String object representing the specified integer as unsigned binary number.
o toHexString(int)
Returns a new String object representing the specified integer as unsigned hexidecimal number.
o toOctalString(int)
Returns a new String object representing the specified integer as unsigned octal number.
o toString()
Returns a String object representing this Integer's value.
o toString(int)
Returns a new String object representing the specified integer.
o toString(int, int)
Returns a new String object representing the specified integer in the specified radix.
o valueOf(String)
Assuming the specified String represents an integer, returns a new Integer object initialized to that value.
o valueOf(String, int)
Assuming the specified String represents an integer, returns a new Integer object initialized to that value.

Variables

o 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.
o 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.

Constructors

o Integer 
public Integer(int value)
Constructs an Integer object initialized to the specified int value.
Parameters:
value - the initial value of the Integer
o 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.

Methods

o 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
o toHexString 
public static String toHexString(int i)
Returns a new String object representing the specified integer as unsigned hexidecimal number.
o toOctalString 
public static String toOctalString(int i)
Returns a new String object representing the specified integer as unsigned octal number.
o toBinaryString 
public static String toBinaryString(int i)
Returns a new String object representing the specified integer as unsigned binary number.
o 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
o 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.
o 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.
o 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.
o 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.
o intValue 
public int intValue()
Returns the value of this Integer as an int.
Overrides:
intValue in class Number
o longValue 
public long longValue()
Returns the value of this Integer as a long.
Overrides:
longValue in class Number
o floatValue 
public float floatValue()
Returns the value of this Integer as a float.
Overrides:
floatValue in class Number
o doubleValue 
public double doubleValue()
Returns the value of this Integer as a double.
Overrides:
doubleValue in class Number
o toString 
public String toString()
Returns a String object representing this Integer's value.
Overrides:
toString in class Object
o hashCode 
public int hashCode()
Returns a hashcode for this Integer.
Overrides:
hashCode in class Object
o 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
o 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
o 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
o 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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