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decode
public static Long decode(
String nm
)
throws
NumberFormatException
Decodes a String into a Long.
Accepts decimal, hexadecimal, and octal numbers given by the
following grammar:
- DecodableString:
- Signopt DecimalNumeral
- Signopt
0x HexDigits
- Signopt
0X HexDigits
- Signopt
# HexDigits
- Signopt
0 OctalDigits
- Sign:
-
DecimalNumeral, HexDigits, and OctalDigits
are defined in §3.10.1
of the Java
Language Specification.
The sequence of characters following an (optional) negative
sign and/or radix specifier ("0x",
"0X", "#", or
leading zero) is parsed as by the Long.parseLong
method with the indicated radix (10, 16, or 8). This sequence
of characters must represent a positive value or a NumberFormatException will be thrown. The result is negated
if first character of the specified String is the
minus sign. No whitespace characters are permitted in the
String.
getLong
public static Long getLong(
String nm
)
Determines the 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 the getProperty(java.lang.String) method. 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, if the
specified name is empty or null, or if the
property does not have the correct numeric format, then
null is returned.
In other words, this method returns a Long object equal to
the value of:
getLong(nm, null)
getLong
public static Long getLong(
String nm,
long val
)
Determines the 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 the getProperty(java.lang.String) method. 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.
The second argument is the default value. A Long object
that represents the value of the second argument is returned if there
is no property of the specified name, if the property does not have
the correct numeric format, or if the specified name is empty or null.
In other words, this method returns a Long object equal
to the value of:
getLong(nm, new Long(val))
but in practice it may be implemented in a manner such as:
Long result = getLong(nm, null);
return (result == null) ? new Long(val) : result;
to avoid the unnecessary allocation of a Long object when
the default value is not needed.
getLong
public static Long getLong(
String nm,
Long val
)
Returns the 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
the getProperty(java.lang.String)
method. The string value of this property is then interpreted
as a long value, as per the
Long.decode method, and a Long object
representing this value is returned.
- If the property value begins with the two ASCII characters
0x or the ASCII character #, not followed by
a minus sign, then the rest of it is parsed as a hexadecimal integer
exactly as for the method valueOf(java.lang.String,int)
with radix 16.
- If the property value begins with the ASCII character
0 followed by another character, it is parsed as
an octal integer exactly as by the method valueOf(java.lang.String,int) with radix 8.
- Otherwise the property value is parsed as a decimal
integer exactly as by the method
valueOf(java.lang.String,int) with radix 10.
Note that, in every case, neither L
('\u004C') nor l
('\u006C') is permitted to appear at the end
of the property value as a type indicator, as would be
permitted in Java programming language source code.
The second argument is the default value. The default value is
returned if there is no property of the specified name, if the
property does not have the correct numeric format, or if the
specified name is empty or null.
parseLong
public static long parseLong(
String s
)
throws
NumberFormatException
Parses the string argument as a signed decimal
long. The characters in the string must all be
decimal digits, except that the first character may be an ASCII
minus sign '-' (\u002D') to
indicate a negative value. The resulting long
value is returned, exactly as if the argument and the radix
10 were given as arguments to the parseLong(java.lang.String,int) method.
Note that neither the character L
('\u004C') nor l
('\u006C') is permitted to appear at the end
of the string as a type indicator, as would be permitted in
Java programming language source code.
parseLong
public static long parseLong(
String s,
int radix
)
throws
NumberFormatException
Parses the string argument as a signed 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 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 long
value is returned.
Note that neither the character L
('\u004C') nor l
('\u006C') is permitted to appear at the end
of the string as a type indicator, as would be permitted in
Java programming language source code - except that either
L or l may appear as a digit for a
radix greater than 22.
An exception of type NumberFormatException is
thrown if any of the following situations occurs:
- The first argument is
null or is a string of
length zero.
- The
radix is either smaller than MIN_RADIX or larger than MAX_RADIX.
- Any character of the string is not a digit of the specified
radix, except that the first character may be a minus sign
'-' ('\u002d') provided that the
string is longer than length 1.
- The value represented by the string is not a value of type
long.
Examples:
parseLong("0", 10) returns 0L
parseLong("473", 10) returns 473L
parseLong("-0", 10) returns 0L
parseLong("-FF", 16) returns -255L
parseLong("1100110", 2) returns 102L
parseLong("99", 8) throws a NumberFormatException
parseLong("Hazelnut", 10) throws a NumberFormatException
parseLong("Hazelnut", 36) returns 1356099454469L
toBinaryString
public static String toBinaryString(
long i
)
Returns a string representation of the long
argument as an unsigned integer in base 2.
The unsigned long value is the argument plus
264 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
0s. 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.
toHexString
public static String toHexString(
long i
)
Returns a string representation of the long
argument as an unsigned integer in base 16.
The unsigned long value is the argument plus
264 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 0s. 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:
0123456789abcdef
These are the characters '\u0030' through
'\u0039' and '\u0061' through
'\u0066'. If uppercase letters are desired,
the toUpperCase() method may be called
on the result:
Long.toHexString(n).toUpperCase()
toOctalString
public static String toOctalString(
long i
)
Returns a string representation of the long
argument as an unsigned integer in base 8.
The unsigned long value is the argument plus
264 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
0s.
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 octal
digits:
01234567
These are the characters '\u0030' through
'\u0037'.
toString
public static String toString(
long i
)
Returns a String object representing the specified
long. The argument is converted to signed decimal
representation and returned as a string, exactly as if the
argument and the radix 10 were given as arguments to the toString(long,int) method.
toString
public static String toString(
long i,
int radix
)
Returns 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 sign '-'
('\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:
0123456789abcdefghijklmnopqrstuvwxyz
These are '\u0030' through
'\u0039' and '\u0061' through
'\u007a'. If 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) are
0123456789abcdef. If uppercase letters are
desired, the toUpperCase() method may
be called on the result:
Long.toString(n, 16).toUpperCase()
valueOf
public static Long valueOf(
String s
)
throws
NumberFormatException
Returns a Long object holding the value
of the specified String. The argument is
interpreted as representing a signed decimal long,
exactly as if the argument were given to the parseLong(java.lang.String) method. The result is a
Long object that represents the integer value
specified by the string.
In other words, this method returns a Long object
equal to the value of:
new Long(Long.parseLong(s))
valueOf
public static Long valueOf(
String s,
int radix
)
throws
NumberFormatException
Returns a Long object holding the value
extracted from the specified String when parsed
with the radix given by the second argument. The first
argument is interpreted as representing a signed
long in the radix specified by the second
argument, exactly as if the arguments were given to the parseLong(java.lang.String,int) method. The result is a
Long object that represents the long
value specified by the string.
In other words, this method returns a Long object equal
to the value of:
new Long(Long.parseLong(s, radix))
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