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public final class java.lang.Integer
extends java.lang.Number
{
// Fields
public final static int MAX_VALUE;
public final static int MIN_VALUE;
// Constructors
public Integer(int value);
public Integer(String s);
// Methods
public double doubleValue();
public boolean equals(Object obj);
public float floatValue();
public static Integer getInteger(String nm);
public static Integer getInteger(String nm, int val);
public static Integer getInteger(String nm, Integer val);
public int hashCode();
public int intValue();
public long longValue();
public static int parseInt(String s);
public static int parseInt(String s, int radix);
public static String toBinaryString(int i);
public static String toHexString(int i);
public static String toOctalString(int i);
public String toString();
public static String toString(int i);
public static String toString(int i, int radix);
public static Integer valueOf(String s);
public static Integer valueOf(String s, int radix);
}
This 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 a number of 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.
public final static int MAX_VALUE = 2147483647The largest value of type int.
public final static int MIN_VALUE = -2147483648The smallest value of type int.
public Integer(int value)Constructs a newly allocated Integer object that represents the primitive int argument.
Parameter Description value the value to be reprsented by the Integer
public Integer(String s)throws NumberFormatExceptionConstructs 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 .
Parameter Description s the String to be converted to an Integer Throw:
If the String does not contain a parsable integer.
public double doubleValue()Return Value:
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 .
public boolean equals(Object obj)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.
Return Value:
Returns true if the objects are the same; false otherwise.
Parameter Description obj the object to compare with Overrides:
equals in class Object .
public float floatValue()Return Value:
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 .
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 to be obtained as if by the method System.getProperty . The string value of this property is then interpreted as an integer value and an Integer object representing this value is returned. The full details of the possible numeric formats are given in 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.
Return Value:
Returns the Integer value of the property.
Parameter Description nm property name
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 to be obtained as if by the method System.getProperty . The string value of this property is then interpreted as an integer value and an Integer object representing this value is returned. The full details of the possible numeric formats are given in 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.
Return Value:
Returns the Integer value of the property.
Parameter Description nm property name val default value
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 to be obtained as if by the method System.getProperty . 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.
Return Value:
Returns the Integer value of the property.
Parameter Description nm property name val default value
public int hashCode()Return Value:
Returns a hash code value for this object.
Overrides:
hashCode in class Object .
public int intValue()Return Value:
Returns The int value represented by this object is returned.
Overrides:
intValue in class Number .
public long longValue()Return Value:
Returns The int value represented by this object is converted to type long and the result of the conversion is returned..
Overrides:
longValue in class Number .
public static int parseInt(String s)throws NumberFormatExceptionParses 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.
Return Value:
Returns the integer represented by the argument in decimal.
Parameter Description s a string Throw:
If the string does not contain a parsable integer.
public static int parseInt(String s, int radix)throws NumberFormatExceptionParses 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 the an ASCII minus sign '-' to indicate a negative value. The resulting integer value is returned.
Return Value:
Returns the integer represented by the string argument in the specified radix.
Parameter Description s the String containing the integer radix the radix to be used Throw:
If the string does not contain a parsable integer.
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 232 if 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 0's.
Return Value:
Returns the string representation of the unsigned integer value represented by the argument in binary (base 2).
Parameter Description i an integer
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 0's.
Return Value:
Returns the string representation of the unsigned integer value represented by the argument in hexadecimal (base 16).
Parameter Description i an integer
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 0's.
Return Value:
Returns the string representation of the unsigned integer value represented by the argument in octal (base 8).
Parameter Description i an integer
public String toString()Return Value:
Returns a string representation of the value of this object in base 10.
Overrides:
toString in class Object .
public static String toString(int i)Return Value:
Returns a string representation of the argument in base 10.
Parameter Description i an integer to be converted
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 characer '-' . If the first argument is not negative, no sign character appears in the result. The following ASCII characters are used as digits:
0123456789abcdefghijklmnopqrstuvwxyz
Return Value:
Returns a string representation of the argument in the specified radix.
Parameter Description i an integer radix the radix
public static Integer valueOf(String s)throws NumberFormatExceptionReturn Value:
Returns a newly constructed Integer initialized to the value represented by the string argument.
Parameter Description s the string to be parsed Throw:
If the string does not contain a parsable integer.
public static Integer valueOf(String s, int radix)throws NumberFormatExceptionReturn Value:
Returns a newly constructed Integer initialized to the value represented by the string argument in the specified radix.
Parameter Description s the string to be parsed Throw:
If the String does not contain a parsable integer.
(1)This method is new in Java 1.1
(2)This method is new in Java 1.1.
(3)This method is new in Java 1.1.
© 1996 Sun Microsystems, Inc. All rights reserved.