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java.lang.Object | +----java.lang.Number | +----java.lang.Long
long
in an object. An object of type Long
contains a single
field whose type is long
.
In addition, this class provides several methods for converting a
long
to a String
and a
String
to a long
, as well as other
constants and methods useful when dealing with a
long
.
long
.
long
.
Long
object that
represents the primitive long
argument.
Long
object that
represents the value represented by the string.
long
value of the system property
with the specified name.
long
value of the system property
with the specified name.
long
value of the system property
with the specified name.
long
.
long
in the
radix specified by the second argument.
public static final long MIN_VALUE
long
.
public static final long MAX_VALUE
long
.
public static final Class TYPE
public Long(long value)
Long
object that
represents the primitive long
argument.
Long
.
public Long(String s) throws NumberFormatException
Long
object that
represents the value represented by the string. The string is
converted to an long
value as if by the
valueOf
method.
Long
.
String
does not
contain a parsable long integer.
public static String toString(long 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 sign '-'
. 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(long i)
The unsigned long value is the argument plus 2^{64} 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.
long
.
public static String toOctalString(long i)
The unsigned long value is the argument plus 2^{64} 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.
long
.
public static String toBinaryString(long i)
The unsigned long value is the argument plus 2^{64} 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(long i)
long
to be converted.
public static long parseLong(String s, int radix) throws NumberFormatException
long
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 an
ASCII minus sign '-'
to indicate a negative value.
The resulting long
value is returned.
String
containing the
long
.
long
represented by the string argument in
the specified radix.
public static long parseLong(String s) throws NumberFormatException
long
.
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.
long
represented by the argument in decimal.
long
.
public static Long valueOf(String s, int radix) throws NumberFormatException
String
containing the
long
.
Long
initialized to the
value represented by the string argument in the specified
radix.
String
does not
contain a parsable long
.
public static Long valueOf(String s) throws NumberFormatException
Long
initialized to the
value represented by the string argument.
String
does not
contain a parsable long
.
public byte byteValue()shortValue
public short shortValue()
public int intValue()
public long longValue()
public float floatValue()
long
value represented by this object is
converted to type float
and the result of
the conversion is returned.
public double doubleValue()
long
value represented by this object that
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 a Long
object that
contains the same long
value as this object.
public static Long getLong(String nm)
long
value of the system property
with the specified name.
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 a long value
and a Long
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.
Long
value of the property.
public static Long getLong(String nm, long val)
long
value of the system property
with the specified name.
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 a long value
and a Long
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 a
Long
object that represents the value of the second
argument is returned.
Long
value of the property.
public static Long getLong(String nm, Long val)
long
value of the system property
with the specified name.
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 a long value
and a Long
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
Long.valueOf
with radix 16.
If the property value begins with "0
",
then it is parsed as an octal integer exactly as for the method
Long.valueOf
with radix 8.
Otherwise the property value is parsed as a decimal integer
exactly as for the method Long.valueOf
with radix 10.
Note that, in every case, neither L
nor
l
is permitted to appear at the end of the string.
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.
Long
value.
long
value of the property.
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