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java.lang.Objectjava.lang.Integer
@TransactionType(value=NOT_SUPPORTED) public final class Integer
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
.
Instances of the Integer class are not bound to any context and can be passed
between contexts without any restrictions. Objects created and returned
by the methods of this class are owned by the caller. In particular, a call to the toString(int, int)
returns a String instance bound to the owner context of the caller.
See Runtime Environment Specification for the Java Card Platform, Connected Edition, chapter 7 for details regarding transfer of ownership.
Field Summary | |
---|---|
static int |
MAX_VALUE
The largest value of type int . |
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 | |
---|---|
byte |
byteValue()
Returns the value of this Integer as a byte. |
boolean |
equals(Object obj)
Compares this object to the specified object. |
int |
hashCode()
Returns a hashcode for this Integer. |
int |
intValue()
Returns the value of this Integer as an int. |
long |
longValue()
Returns the value of this Integer as a long. |
static int |
parseInt(String s)
Parses the string argument as a signed decimal integer. |
static int |
parseInt(String s,
int radix)
Parses the string argument as a signed integer in the radix specified by the second argument. |
short |
shortValue()
Returns the value of this Integer as a short. |
static String |
toBinaryString(int i)
Creates a string representation of the integer argument as an unsigned integer in base 2. |
static String |
toHexString(int i)
Creates a string representation of the integer argument as an unsigned integer in base 16. |
static String |
toOctalString(int i)
Creates a string representation of the integer argument as an unsigned integer in base 8. |
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. |
static String |
toString(int i,
int radix)
Creates a string representation of the first argument in the radix specified by the second argument. |
static Integer |
valueOf(int value)
Returns a Integer instance representing the specified int value. |
static Integer |
valueOf(String s)
Returns a new Integer object initialized to the value of the specified String. |
static Integer |
valueOf(String s,
int radix)
Returns a new Integer object initialized to the value of the specified String. |
Methods inherited from class java.lang.Object |
---|
getClass, notify, notifyAll, wait, wait, wait |
Field Detail |
---|
public static final int MIN_VALUE
int
. The constant value of
this field is -2147483648.
public static final int MAX_VALUE
int
. The constant value of this
field is 2147483647.
Constructor Detail |
---|
public Integer(int value)
Integer
object that
represents the primitive int
argument.
value
- the value to be represented by the Integer
.Method Detail |
---|
public static String toString(int i, int radix)
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 '-'
('\u002d'). If
the first argument is not negative, no sign character appears in the
result.
The remaining characters of the result represent the magnitude of the first argument. If the magnitude is zero, it is represented by a single zero character '0' ('\u0030'); otherwise, the first character of the representation of the magnitude will not be the zero character. The following ASCII characters are used as digits:
These are '\u0030' through '\u0039' and '\u0061' through '\u007a'. If the radix is N, then the first N of these characters are used as radix-N digits in the order shown. Thus, the digits for hexadecimal (radix 16) are0123456789abcdefghijklmnopqrstuvwxyz
0123456789abcdef .
i
- an integer.radix
- the radix.
Character.MAX_RADIX
,
Character.MIN_RADIX
public static String toHexString(int i)
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. If the unsigned magnitude is
zero, it is represented by a single zero character '0' ('\u0030');
otherwise, the first character of the representation of the unsigned
magnitude will not be the zero character. The following characters are
used as hexadecimal digits:
These are the characters '\u0030' through '\u0039' and 'u\0039' through '\u0066'.0123456789abcdef
i
- an integer.
public static String toOctalString(int i)
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.
If the unsigned magnitude is zero, it is represented by a single zero character '0' ('\u0030'); otherwise, the first character of the representation of the unsigned magnitude will not be the zero character. The octal digits are:
These are the characters '\u0030' through '\u0037'.01234567
i
- an integer
public static String toBinaryString(int i)
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 0
s.
If the unsigned magnitude is zero, it is represented by a single zero
character '0' ('\u0030'); otherwise, the
first character of the representation of the unsigned magnitude will not
be the zero character. The characters '0' ('\u0030')
and '1' ('\u0031') are used as binary digits.
i
- an integer.
public static String toString(int i)
toString(int, int)
method.
i
- an integer to be converted.
public static int parseInt(String s, int radix) throws NumberFormatException
Character.digit(char, int)
returns a nonnegative
value), except that the first character may be an ASCII minus sign
'-'
('\u002d'
) to indicate a negative
value. The resulting integer value is returned.
An exception of type NumberFormatException is thrown if any of the following situations occurs:
Character.MIN_RADIX
or larger than
Character.MAX_RADIX
.
Examples:
parseInt("0", 10) returns 0 parseInt("473", 10) returns 473 parseInt("-0", 10) returns 0 parseInt("-FF", 16) returns -255 parseInt("1100110", 2) returns 102 parseInt("2147483647", 10) returns 2147483647 parseInt("-2147483648", 10) returns -2147483648 parseInt("2147483648", 10) throws a NumberFormatException parseInt("99", 8) throws a NumberFormatException parseInt("Kona", 10) throws a NumberFormatException parseInt("Kona", 27) returns 411787
s
- the String
containing the integer.radix
- the radix to be used.
NumberFormatException
- if the string does not contain a parsable integer.public static int parseInt(String s) throws NumberFormatException
'-'
('\u002d')
to indicate a negative value. The resulting integer value is returned,
exactly as if the argument and the radix 10 were given as arguments to
the parseInt(java.lang.String, int)
method.
s
- a string.
NumberFormatException
- if the string does not contain a parsable integer.public static Integer valueOf(String s, int radix) throws NumberFormatException
parseInt(java.lang.String, int)
method. The result is an Integer
object that represents
the integer value specified by the string.
In other words, this method returns an Integer
object
equal to the value of:
new Integer(Integer.parseInt(s, radix))
s
- the string to be parsed.radix
- the radix of the integer represented by string s
Integer
initialized to the
value represented by the string argument in the specified radix.
NumberFormatException
- if the String cannot be parsed as an int
.public static Integer valueOf(String s) throws NumberFormatException
parseInt(java.lang.String)
method. The result is an
Integer object that represents the integer value specified by
the string.
In other words, this method returns an Integer object equal to the value of:
new Integer(Integer.parseInt(s))
s
- the string to be parsed.
Integer
initialized to the
value represented by the string argument.
NumberFormatException
- if the string cannot be parsed as an integer.public byte byteValue()
public short shortValue()
public int intValue()
int
value represented by this object.public long longValue()
int
value represented by this object that is
converted to type long
and the result of the
conversion is returned.public String toString()
toString(int)
method.
toString
in class Object
public int hashCode()
hashCode
in class Object
Object.equals(java.lang.Object)
,
Hashtable
public boolean equals(Object obj)
true
if and only if the argument is not null
and is an Integer
object that contains the same
int
value as this object.
equals
in class Object
obj
- the object to compare with.
true
if the objects are the same;
false
otherwise.Boolean.hashCode()
,
Hashtable
public static Integer valueOf(int value)
Integer(int)
, as this method is likely to yield
significantly better space and time performance by caching frequently
requested values.
value
- an int
value.
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