java.lang
Class Integer

java.lang.Object
  java.lang.Integer

public final class Integer
extends Object

Minimal Integer implementation that supports converting an int to a String.

Field Summary

static int	MAX_RADIX Normally this is stored in Character in the standard java.lang package but we don't have Character.
static int	MAX_VALUE The largest value of type int.
static int	MIN_RADIX Normally this is stored in Character in the standard java.lang package but we don't have Character.
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

static int	digit(char ch, int radix) This method accepts a character such as '7' or 'C' and converts it to a number value.
static int	digit(int codePoint, int radix)
static int	parseInt(String s)
static int	parseInt(String s, int radix) This method parses an int from a String.
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.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, 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

MIN_RADIX

public static final int MIN_RADIX

Normally this is stored in Character in the standard java.lang package but we don't have Character.

See Also:

Constant Field Values

MAX_RADIX

public static final int MAX_RADIX

Normally this is stored in Character in the standard java.lang package but we don't have Character.

See Also:

Constant Field Values

Constructor Detail

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.

Method Detail

parseInt

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

This method parses an int from a String. The string can contain letters if the number system is larger than decimal, such as hexidecimal numbers.

Parameters:

s - The number string e.g. "123" or "FF" if radix is 16.

radix - The base number system e.g. 16

Returns:

the integer value

Throws:

NumberFormatException

parseInt

public static int parseInt(String s)
                    throws NumberFormatException

Throws:

NumberFormatException

digit

public static int digit(char ch,
                        int radix)

This method accepts a character such as '7' or 'C' and converts it to a number value. So '7' returns 7 and 'C' returns 12, which is the hexidecimal value of C. You must specify a radix for the number system, and if your character is outside the bounds it throws a NumberFormatException. e.g. 'G' with radix of 16 will throw the exception. Normally this method is in Character but we don't have that class. If we ever make one we can move this method to it.

Parameters:

ch -

radix -

Returns:

the digit

digit

public static int digit(int codePoint,
                        int radix)

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.

Parameters:

i - an integer to be converted.

Returns:

a string representation of the argument in base 10.

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.

Overrides:

toString in class Object

Returns:

a string representation of the value of this object in base 10.