public final class TypeFormat extends Object
This class provides utility methods to parse CharSequence
into primitive types and to format primitive types into
StringBuffer.
Methods from this utility class do not create temporary objects
and are typically faster than standard library methods (e.g parseDouble(java.lang.CharSequence) is up to 15x faster than Double.parseDouble).
For class instances, formatting is typically performed using specialized
java.text.Format (Locale sensitive)
and/or using conventional methods (class sensitive). For example:
public class Foo {
public static Foo valueOf(CharSequence chars) {...} // Parses.
public StringBuffer appendTo(StringBuffer sb) {...} // Formats.
public String toString() {
return appendTo(new StringBuffer()).toString();
}
}
This class is public domain (not copyrighted).
| Modifier and Type | Method and Description |
|---|---|
static StringBuffer |
format(boolean b,
StringBuffer sb)
Formats the specified
boolean and appends the resulting
text to the StringBuffer argument. |
static StringBuffer |
format(double d,
double precision,
StringBuffer sb)
Formats the specified
double and appends the resulting text
to the StringBuffer argument; the number of significative
digits is deduced from the specifed precision. |
static StringBuffer |
format(double d,
int digits,
StringBuffer sb)
Formats the specified
double and appends the resulting text
to the StringBuffer argument; the number of significand
digits is specified as integer argument. |
static StringBuffer |
format(double d,
StringBuffer sb)
Formats the specified
double and appends the resulting
text to the StringBuffer argument. |
static StringBuffer |
format(float f,
float precision,
StringBuffer sb)
Formats the specified
float and appends the resulting text
to the StringBuffer argument; the number of significative
digits is deduced from the specifed precision. |
static StringBuffer |
format(float f,
StringBuffer sb)
Formats the specified
float and appends the resulting
text to the StringBuffer argument. |
static StringBuffer |
format(int i,
int radix,
StringBuffer sb)
Formats the specified
int in the specified radix and appends
the resulting text to the StringBuffer argument. |
static StringBuffer |
format(int i,
StringBuffer sb)
Formats the specified
int and appends the resulting
text (decimal representation) to the StringBuffer argument. |
static StringBuffer |
format(long l,
int radix,
StringBuffer sb)
Formats the specified
long in the specified radix and
appends the resulting text to the StringBuffer argument. |
static StringBuffer |
format(long l,
StringBuffer sb)
Formats the specified
long and appends the resulting
text (decimal representation) to the StringBuffer argument. |
static StringBuffer |
format(short s,
int radix,
StringBuffer sb)
Formats the specified
short in the specified radix and
appends the resulting text to the StringBuffer argument. |
static StringBuffer |
format(short s,
StringBuffer sb)
Formats the specified
short and appends the resulting
text (decimal representation) to the StringBuffer argument. |
static int |
indexOf(CharSequence pattern,
CharSequence chars,
int fromIndex)
Searches for a particular sequence within a character sequence
(general purpose parsing function).
|
static boolean |
parseBoolean(CharSequence chars)
Parses the specified
CharSequence as a boolean. |
static double |
parseDouble(CharSequence chars)
Parses this
CharSequence as a double. |
static float |
parseFloat(CharSequence chars)
Parses this
CharSequence as a float. |
static int |
parseInt(CharSequence chars)
Parses the specified
CharSequence as a signed decimal
int. |
static int |
parseInt(CharSequence chars,
int radix)
Parses the specified
CharSequence as a signed
int in the specified radix. |
static long |
parseLong(CharSequence chars)
Parses the specified
CharSequence as a signed decimal
long. |
static long |
parseLong(CharSequence chars,
int radix)
Parses the specified
CharSequence as a signed
long in the specified radix. |
static short |
parseShort(CharSequence chars)
Parses the specified
CharSequence as a signed decimal
short. |
static short |
parseShort(CharSequence chars,
int radix)
Parses the specified
CharSequence as a signed
short in the specified radix. |
public static int indexOf(CharSequence pattern, CharSequence chars, int fromIndex)
pattern - the character sequence to search for.chars - the character sequence being searched.fromIndex - the index in chars to start the search
from.[fromIndex, chars.length()-pattern.length()]
or -1 if the character sequence is not found.public static boolean parseBoolean(CharSequence chars)
CharSequence as a boolean.chars - the character sequence to parse.boolean.public static short parseShort(CharSequence chars)
CharSequence as a signed decimal
short.chars - the character sequence to parse.parseShort(chars, 10)NumberFormatException - if the specified character sequence
does not contain a parsable short.parseShort(CharSequence, int)public static short parseShort(CharSequence chars, int radix)
CharSequence as a signed
short in the specified radix. The characters in the string
must all be digits of the specified radix, except the first character
which may be a plus sign '+' or a minus sign
'-'.chars - the character sequence to parse.radix - the radix to be used while parsing.short.NumberFormatException - if the specified character sequence
does not contain a parsable short.public static int parseInt(CharSequence chars)
CharSequence as a signed decimal
int.chars - the character sequence to parse.parseInt(chars, 10)NumberFormatException - if the specified character sequence
does not contain a parsable int.parseInt(CharSequence, int)public static int parseInt(CharSequence chars, int radix)
CharSequence as a signed
int in the specified radix. The characters in the string
must all be digits of the specified radix, except the first character
which may be a plus sign '+' or a minus sign
'-'.chars - the character sequence to parse.radix - the radix to be used while parsing.int.NumberFormatException - if the specified character sequence
does not contain a parsable int.public static long parseLong(CharSequence chars)
CharSequence as a signed decimal
long.chars - the character sequence to parse.parseLong(chars, 10)NumberFormatException - if the specified character sequence
does not contain a parsable long.parseLong(CharSequence, int)public static long parseLong(CharSequence chars, int radix)
CharSequence as a signed
long in the specified radix. The characters in the string
must all be digits of the specified radix, except the first character
which may be a plus sign '+' or a minus sign
'-'.chars - the character sequence to parse.radix - the radix to be used while parsing.long.NumberFormatException - if the specified character sequence
does not contain a parsable long.public static float parseFloat(CharSequence chars)
CharSequence as a float.chars - the character sequence to parse.NumberFormatException - if the character sequence does not contain
a parsable float.public static double parseDouble(CharSequence chars) throws NumberFormatException
CharSequence as a double.chars - the character sequence to parse.NumberFormatException - if the character sequence does not contain
a parsable double.public static StringBuffer format(boolean b, StringBuffer sb)
boolean and appends the resulting
text to the StringBuffer argument.b - a boolean.sb - the StrinBuffer to append.StringBuffer object.parseBoolean(java.lang.CharSequence)public static StringBuffer format(short s, StringBuffer sb)
short and appends the resulting
text (decimal representation) to the StringBuffer argument.
Note: This method is preferred to StringBuffer.append(short)
as it does not create temporary String
objects (several times faster for small numbers).
s - the short number.sb - the StrinBuffer to append.StringBuffer object.parseShort(java.lang.CharSequence)public static StringBuffer format(short s, int radix, StringBuffer sb)
short in the specified radix and
appends the resulting text to the StringBuffer argument.s - the short number.radix - the radix.sb - the StrinBuffer to append.StringBuffer object.throws IllegalArgumentException if radix is not in [2 .. 36] range.public static StringBuffer format(int i, StringBuffer sb)
int and appends the resulting
text (decimal representation) to the StringBuffer argument.
Note: This method is preferred to StringBuffer.append(int)
as it does not create temporary String
objects (several times faster for small numbers).
i - the int number.sb - the StrinBuffer to append.StringBuffer object.parseInt(java.lang.CharSequence)public static StringBuffer format(int i, int radix, StringBuffer sb)
int in the specified radix and appends
the resulting text to the StringBuffer argument.i - the int number.radix - the radix.sb - the StrinBuffer to append.StringBuffer object.throws IllegalArgumentException if radix is not in [2 .. 36] range.public static StringBuffer format(long l, StringBuffer sb)
long and appends the resulting
text (decimal representation) to the StringBuffer argument.
Note: This method is preferred to StringBuffer.append(long)
as it does not create temporary String
objects (several times faster for small numbers).
l - the long number.sb - the StrinBuffer to append.StringBuffer object.parseLong(java.lang.CharSequence)public static StringBuffer format(long l, int radix, StringBuffer sb)
long in the specified radix and
appends the resulting text to the StringBuffer argument.l - the long number.radix - the radix.sb - the StrinBuffer to append.StringBuffer object.throws IllegalArgumentException if radix is not in [2 .. 36] range.public static StringBuffer format(float f, StringBuffer sb)
float and appends the resulting
text to the StringBuffer argument.f - the float number.sb - the StrinBuffer to append.format(f, 0.0f, sb)format(float, float, StringBuffer)public static StringBuffer format(float f, float precision, StringBuffer sb)
float and appends the resulting text
to the StringBuffer argument; the number of significative
digits is deduced from the specifed precision. All digits at least as
significant as the specified precision are represented. For example:
format(5.6f, 0.01f, sb) appends "5.60"format(5.6f, 0.1f, sb) appends "5.6"format(5.6f, 1f, sb) appends "6"0.0f, the precision is assumed to be
the intrinsic float precision (64 bits IEEE 754 format);
no formatting is performed, all significant digits are displayed and
trailing zeros are removed.f - the float number.precision - the maximum weight of the last digit represented.sb - the StrinBuffer to append.StringBuffer object.IllegalArgumentException - if the specified precision is negative
or would result in too many digits (19+).public static StringBuffer format(double d, StringBuffer sb)
double and appends the resulting
text to the StringBuffer argument.
Note : This method is preferred to StringBuffer.append(double)
or even String.valueOf(double) as it
does not create temporary String or
FloatingDecimal objects (several times faster,
e.g. 15x faster for Double.MAX_VALUE).
d - the double number.sb - the StrinBuffer to append.format(d, 0.0, sb)format(double, double, StringBuffer)public static StringBuffer format(double d, int digits, StringBuffer sb)
double and appends the resulting text
to the StringBuffer argument; the number of significand
digits is specified as integer argument.d - the double number.digits - the number of significand digits (excludes exponent).sb - the StrinBuffer to append.StringBuffer object.IllegalArgumentException - if the number of digits is not in
range [1..19].public static StringBuffer format(double d, double precision, StringBuffer sb)
double and appends the resulting text
to the StringBuffer argument; the number of significative
digits is deduced from the specifed precision. All digits at least as
significant as the specified precision are represented. For example:
format(5.6, 0.01, sb) appends "5.60"format(5.6, 0.1, sb) appends "5.6"format(5.6, 1, sb) appends "6"0.0, the precision is assumed to be
the intrinsic double precision (64 bits IEEE 754 format);
no formatting is performed, all significant digits are displayed and
trailing zeros are removed.d - the double number.precision - the maximum weight of the last digit represented.sb - the StrinBuffer to append.StringBuffer object.IllegalArgumentException - if the specified precision is negative
or would result in too many digits (19+).Copyright © 2001-2014 Codehaus. All Rights Reserved.