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java.lang.Object | +----java.lang.Number | +----java.lang.Integer
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
.
int
.
int
.
Integer
object that
represents the primitive int
argument.
Integer
object that
represents the value represented by the string.
public static final int MIN_VALUE
int
.
public static final int MAX_VALUE
int
.
public static final Class TYPE
public Integer(int value)
Integer
object that
represents the primitive int
argument.
Integer
.
public Integer(String s) throws NumberFormatException
Integer
object that
represents the value represented by the string. The string is
converted to an int value as if by the valueOf
method.
String
to be converted to an
Integer
.
String
does not
contain a parsable integer.
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 '-'
. If the first
argument is not negative, no sign character appears in the result.
The following ASCII characters are used as digits:
0123456789abcdefghijklmnopqrstuvwxyz
public static String toHexString(int i)
The unsigned integer value is the argument plus 2^{32} 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.
public static String toOctalString(int i)
The unsigned integer value is the argument plus 2^{32} 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.
public static String toBinaryString(int i)
The unsigned integer value is the argument plus 2^{32}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.
public static String toString(int i)
public static int parseInt(String s, int radix) throws NumberFormatException
Character.digit
returns a
nonnegative value), except that the first character may be an
ASCII minus sign '-'
to indicate a negative value.
The resulting integer value is returned.
String
containing the integer.
public static int parseInt(String s) throws NumberFormatException
'-'
to
indicate a negative value.
public static Integer valueOf(String s, int radix) throws NumberFormatException
Integer
initialized to the
value represented by the string argument in the specified
radix.
String
does not
contain a parsable integer.
public static Integer valueOf(String s) throws NumberFormatException
Integer
initialized to the
value represented by the string argument.
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 float floatValue()
int
value represented by this object is
converted to type float
and the result of the
conversion is returned.
public double doubleValue()
int
value represented by this object is
converted to type double
and the result of the
conversion is returned.
public String toString()
public int hashCode()
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.
true
if the objects are the same;
false
otherwise.
public static Integer getInteger(String nm)
The first argument is treated as the name of a system property.
System properties are accessible through getProperty
and , a method defined by the System
class. The
string value of this property is then interpreted as an integer
value and an Integer
object representing this value is
returned. Details of possible numeric formats can be found with
the definition of 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.
Integer
value of the property.
public static Integer getInteger(String nm, int val)
The first argument is treated as the name of a system property.
System properties are accessible through getProperty
and , a method defined by the System
class. The
string value of this property is then interpreted as an integer
value and an Integer
object representing this value is
returned. Details of possible numeric formats can be found with
the definition of 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.
Integer
value of the property.
public static Integer getInteger(String nm, Integer val)
The first argument is treated as the name of a system property.
System properties are accessible through getProperty
and , a method defined by the System
class. 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.
Integer
value of the property.
public static Integer decode(String nm) throws NumberFormatException
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