Class java.lang.String
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Class java.lang.String
Object
|
+----java.lang.String
- public final class String
- extends Object
- implements Serializable
The String
class represents character strings. All
string literals in Java programs, such as "abc"
, are
implemented as instances of this class.
Strings are constant; their values cannot be changed after they
are created. String buffers support mutable strings.
Because String objects are immutable they can be shared. For example:
String str = "abc";
is equivalent to:
char data[] = {'a', 'b', 'c'};
String str = new String(data);
Here are some more examples of how strings can be used:
System.out.println("abc");
String cde = "cde";
System.out.println("abc" + cde);
String c = "abc".substring(2,3);
String d = cde.substring(1, 2);
The class String
includes methods for examining
individual characters of the sequence, for comparing strings, for
searching strings, for extracting substrings, and for creating a
copy of a string with all characters translated to uppercase or to
lowercase.
The Java language provides special support for the string
concatentation operator ( + ), and for conversion of
other objects to strings. String concatenation is implemented
through the StringBuffer
class and its
append
method.
String conversions are implemented through the method
toString
, defined by Object
and
inherited by all classes in Java. For additional information on
string concatenation and conversion, see Gosling, Joy, and Steele,
The Java Language Specification.
- Version:
- 1.85, 07/01/98
- Author:
- Lee Boynton, Arthur van Hoff
- Since:
- JDK1.0
- See Also:
- toString(), StringBuffer, append(boolean), append(char), append(char[]), append(char[], int, int), append(double), append(float), append(int), append(long), append(java.lang.Object), append(java.lang.String)
-
java.lang.String()
- Allocates a new
String
containing no characters.
-
java.lang.String(String)
- Allocates a new string that contains the same sequence of
characters as the string argument.
-
java.lang.String(char[])
- Allocates a new
String
so that it represents the
sequence of characters currently contained in the character array
argument.
-
java.lang.String(char[], int, int)
- Allocates a new
String
that contains characters from
a subarray of the character array argument.
-
java.lang.String(byte[], int, int, int)
- Allocates a new
String
constructed from a subarray
of an array of 8-bit integer values.
-
java.lang.String(byte[], int)
- Allocates a new
String
containing characters
constructed from an array of 8-bit integer values.
-
java.lang.String(byte[], int, int, String)
- Construct a new
String
by converting the specified
subarray of bytes using the specified character encoding.
-
java.lang.String(byte[], String)
- Construct a new
String
by converting the specified array
of bytes using the specified character encoding.
-
java.lang.String(byte[], int, int)
- Construct a new
String
by converting the specified
subarray of bytes using the platform's default character encoding.
-
java.lang.String(byte[])
- Construct a new
String
by converting the specified array
of bytes using the platform's default character encoding.
-
java.lang.String(StringBuffer)
- Allocates a new string that contains the sequence of characters
currently contained in the string buffer argument.
-
charAt(int)
- Returns the character at the specified index.
-
compareTo(String)
- Compares two strings lexicographically.
-
concat(String)
- Concatenates the specified string to the end of this string.
-
copyValueOf(char[], int, int)
- Returns a String that is equivalent to the specified character array.
-
copyValueOf(char[])
- Returns a String that is equivalent to the specified character array.
-
endsWith(String)
- Tests if this string ends with the specified suffix.
-
equals(Object)
- Compares this string to the specified object.
-
equalsIgnoreCase(String)
- Compares this String to another object.
-
getBytes(int, int, byte[], int)
- Copies characters from this string into the destination byte
array.
-
getBytes(String)
- Convert this
String
into bytes according to the specified
character encoding, storing the result into a new byte array.
-
getBytes()
- Convert this
String
into bytes according to the platform's
default character encoding, storing the result into a new byte array.
-
getChars(int, int, char[], int)
- Copies characters from this string into the destination character array.
-
hashCode()
- Returns a hashcode for this string.
-
indexOf(int)
- Returns the index within this string of the first occurrence of the
specified character.
-
indexOf(int, int)
- Returns the index within this string of the first occurrence of the
specified character, starting the search at the specified index.
-
indexOf(String)
- Returns the index within this string of the first occurrence of the
specified substring.
-
indexOf(String, int)
- Returns the index within this string of the first occurrence of the
specified substring, starting at the specified index.
-
intern()
- Returns a canonical representation for the string object.
-
lastIndexOf(int)
- Returns the index within this string of the last occurrence of the
specified character.
-
lastIndexOf(int, int)
- Returns the index within this string of the last occurrence of the
specified character, searching backward starting at the specified index.
-
lastIndexOf(String)
- Returns the index within this string of the rightmost occurrence
of the specified substring.
-
lastIndexOf(String, int)
- Returns the index within this string of the last occurrence of
the specified substring.
-
length()
- Returns the length of this string.
-
regionMatches(int, String, int, int)
- Tests if two string regions are equal.
-
regionMatches(boolean, int, String, int, int)
- Tests if two string regions are equal.
-
replace(char, char)
- Returns a new string resulting from replacing all occurrences of
oldChar
in this string with newChar
.
-
startsWith(String, int)
- Tests if this string starts with the specified prefix.
-
startsWith(String)
- Tests if this string starts with the specified prefix.
-
substring(int)
- Returns a new string that is a substring of this string.
-
substring(int, int)
- Returns a new string that is a substring of this string.
-
toCharArray()
- Converts this string to a new character array.
-
toLowerCase(Locale)
- Converts all of the characters in this
String
to lower
case using the rules of the given locale.
-
toLowerCase()
- Converts this
String
to lowercase.
-
toString()
- This object (which is already a string!) is itself returned.
-
toUpperCase(Locale)
- Converts all of the characters in this
String
to upper
case using the rules of the given locale.
-
toUpperCase()
- Converts this string to uppercase.
-
trim()
- Removes white space from both ends of this string.
-
valueOf(Object)
- Returns the string representation of the
Object
argument.
-
valueOf(char[])
- Returns the string representation of the
char
array
argument.
-
valueOf(char[], int, int)
- Returns the string representation of a specific subarray of the
char
array argument.
-
valueOf(boolean)
- Returns the string representation of the
boolean
argument.
-
valueOf(char)
- Returns the string representation of the
char
* argument.
-
valueOf(int)
- Returns the string representation of the
int
argument.
-
valueOf(long)
- Returns the string representation of the
long
argument.
-
valueOf(float)
- Returns the string representation of the
float
argument.
-
valueOf(double)
- Returns the string representation of the
double
argument.
String
public String()
- Allocates a new
String
containing no characters.
String
public String(String value)
- Allocates a new string that contains the same sequence of
characters as the string argument.
- Parameters:
- value - a
String
.
String
public String(char value)
- Allocates a new
String
so that it represents the
sequence of characters currently contained in the character array
argument.
- Parameters:
- value - the initial value of the string.
String
public String(char value,
int offset,
int count)
- Allocates a new
String
that contains characters from
a subarray of the character array argument. The offset
argument is the index of the first character of the subarray and
the count
argument specifies the length of the
subarray.
- Parameters:
- value - array that is the source of characters.
- offset - the initial offset.
- count - the length.
- Throws: StringIndexOutOfBoundsException
- if the
offset
and count
arguments index characters outside
the bounds of the value
array.
String
public String(byte ascii,
int hibyte,
int offset,
int count)
- Note: String() is deprecated.
This method does not properly convert bytes into characters.
As of JDK 1.1, the preferred way to do this is via the
String
constructors that take a character-encoding name or
that use the platform's default encoding.
- Allocates a new
String
constructed from a subarray
of an array of 8-bit integer values.
The offset
argument is the index of the first byte
of the subarray, and the count
argument specifies the
length of the subarray.
Each byte
in the subarray is converted to a
char
as specified in the method above.
- Parameters:
- ascii - the bytes to be converted to characters.
- hibyte - the top 8 bits of each 16-bit Unicode character.
- offset - the initial offset.
- count - the length.
- Throws: StringIndexOutOfBoundsException
- if the
offset
or count
argument is invalid.
- See Also:
- String(byte[], int), String(byte[], int, int, java.lang.String), String(byte[], int, int), String(byte[], java.lang.String), String(byte[])
String
public String(byte ascii,
int hibyte)
- Note: String() is deprecated.
This method does not properly convert bytes into characters.
As of JDK 1.1, the preferred way to do this is via the
String
constructors that take a character-encoding name or
that use the platform's default encoding.
- Allocates a new
String
containing characters
constructed from an array of 8-bit integer values. Each character
cin the resulting string is constructed from the
corresponding component b in the byte array such that:
c == (char)(((hibyte & 0xff) << 8)
| (b & 0xff))
- Parameters:
- ascii - the bytes to be converted to characters.
- hibyte - the top 8 bits of each 16-bit Unicode character.
- See Also:
- String(byte[], int, int, java.lang.String), String(byte[], int, int), String(byte[], java.lang.String), String(byte[])
String
public String(byte bytes,
int offset,
int length,
String enc) throws UnsupportedEncodingException
- Construct a new
String
by converting the specified
subarray of bytes using the specified character encoding. The length of
the new String
is a function of the encoding, and hence may
not be equal to the length of the subarray.
- Parameters:
- bytes - The bytes to be converted into characters
- offset - Index of the first byte to convert
- length - Number of bytes to convert
- enc - The name of a character encoding
- Throws: UnsupportedEncodingException
- If the named encoding is not supported
- Since:
- JDK1.1
String
public String(byte bytes,
String enc) throws UnsupportedEncodingException
- Construct a new
String
by converting the specified array
of bytes using the specified character encoding. The length of the new
String
is a function of the encoding, and hence may not be
equal to the length of the byte array.
- Parameters:
- bytes - The bytes to be converted into characters
- enc - A character-encoding name
- Throws: UnsupportedEncodingException
- If the named encoding is not supported
- Since:
- JDK1.1
String
public String(byte bytes,
int offset,
int length)
- Construct a new
String
by converting the specified
subarray of bytes using the platform's default character encoding. The
length of the new String
is a function of the encoding, and
hence may not be equal to the length of the subarray.
- Parameters:
- bytes - The bytes to be converted into characters
- offset - Index of the first byte to convert
- length - Number of bytes to convert
- Since:
- JDK1.1
String
public String(byte bytes)
- Construct a new
String
by converting the specified array
of bytes using the platform's default character encoding. The length of
the new String
is a function of the encoding, and hence may
not be equal to the length of the byte array.
- Parameters:
- bytes - The bytes to be converted into characters
- Since:
- JDK1.1
String
public String(StringBuffer buffer)
- Allocates a new string that contains the sequence of characters
currently contained in the string buffer argument.
- Parameters:
- buffer - a
StringBuffer
.
charAt
public char charAt(int index)
- Returns the character at the specified index. An index ranges
from
0
to length() - 1
.
- Parameters:
- index - the index of the character.
- Returns:
- the character at the specified index of this string.
The first character is at index
0
.
- Throws: StringIndexOutOfBoundsException
- if the index is out of
range.
compareTo
public int compareTo(String anotherString)
- Compares two strings lexicographically.
The comparison is based on the Unicode value of each character in
the strings.
- Parameters:
- anotherString - the
String
to be compared.
- Returns:
- the value
0
if the argument string is equal to
this string; a value less than 0
if this string
is lexicographically less than the string argument; and a
value greater than 0
if this string is
lexicographically greater than the string argument.
concat
public java.lang.String concat(String str)
- Concatenates the specified string to the end of this string.
If the length of the argument string is 0
, then this
object is returned.
- Parameters:
- str - the
String
that is concatenated to the end
of this String
.
- Returns:
- a string that represents the concatenation of this object's
characters followed by the string argument's characters.
copyValueOf
public static java.lang.String copyValueOf(char data,
int offset,
int count)
- Returns a String that is equivalent to the specified character array.
It creates a new array and copies the characters into it.
- Parameters:
- data - the character array.
- offset - initial offset of the subarray.
- count - length of the subarray.
- Returns:
- a
String
that contains the characters of the
specified subarray of the character array.
copyValueOf
public static java.lang.String copyValueOf(char data)
- Returns a String that is equivalent to the specified character array.
It creates a new array and copies the characters into it.
- Parameters:
- data - the character array.
- Returns:
- a
String
that contains the characters of the
character array.
endsWith
public boolean endsWith(String suffix)
- Tests if this string ends with the specified suffix.
- Parameters:
- suffix - the suffix.
- Returns:
-
true
if the character sequence represented by the
argument is a suffix of the character sequence represented by
this object; false
otherwise.
equals
public boolean equals(Object anObject)
- Compares this string to the specified object.
The result is
true
if and only if the argument is not
null
and is a String
object that represents
the same sequence of characters as this object.
- Parameters:
- anObject - the object to compare this
String
against.
- Returns:
-
true
if the String
are equal;
false
otherwise.
- Overrides:
- equals in class Object
- See Also:
- compareTo(java.lang.String), equalsIgnoreCase(java.lang.String)
equalsIgnoreCase
public boolean equalsIgnoreCase(String anotherString)
- Compares this String to another object.
The result is
true
if and only if the argument is not
null
and is a String
object that represents
the same sequence of characters as this object, where case is ignored.
Two characters are considered the same, ignoring case, if at
least one of the following is true:
- The two characters are the same (as compared by the
==
operator).
- Applying the method
Character.toUppercase
to each
character produces the same result.
- Applying the method
Character.toLowercase
to each
character produces the same result.
Two sequences of characters are the same, ignoring case, if the
sequences have the same length and corresponding characters are
the same, ignoring case.
- Parameters:
- anotherString - the
String
to compare this
String
against.
- Returns:
-
true
if the String
s are equal,
ignoring case; false
otherwise.
- See Also:
- toLowerCase(char), toUpperCase(char)
getBytes
public void getBytes(int srcBegin,
int srcEnd,
byte dst,
int dstBegin)
- Note: getBytes() is deprecated.
This method does not properly convert characters into bytes.
As of JDK 1.1, the preferred way to do this is via the
getBytes(String enc)
method, which takes a
character-encoding name, or the getBytes()
method, which
uses the platform's default encoding.
- Copies characters from this string into the destination byte
array. Each byte receives the 8 low-order bits of the
corresponding character.
The first character to be copied is at index srcBegin
;
the last character to be copied is at index srcEnd-1
.
The total number of characters to be copied is
srcEnd-srcBegin
. The characters, converted to bytes,
are copied into the subarray of dst
starting at index
dstBegin
and ending at index:
dstbegin + (srcEnd-srcBegin) - 1
- Parameters:
- srcBegin - index of the first character in the string
to copy.
- srcEnd - index after the last character in the string
to copy.
- dst - the destination array.
- dstBegin - the start offset in the destination array.
- Throws: StringIndexOutOfBoundsException
- if srcBegin or srcEnd is out
of range, or if srcBegin is greater than srcEnd.
getBytes
public byte[] getBytes(String enc) throws UnsupportedEncodingException
- Convert this
String
into bytes according to the specified
character encoding, storing the result into a new byte array.
- Parameters:
- enc - A character-encoding name
- Returns:
- The resultant byte array
- Throws: UnsupportedEncodingException
- If the named encoding is not supported
- Since:
- JDK1.1
getBytes
public byte[] getBytes()
- Convert this
String
into bytes according to the platform's
default character encoding, storing the result into a new byte array.
- Returns:
- the resultant byte array.
- Since:
- JDK1.1
getChars
public void getChars(int srcBegin,
int srcEnd,
char dst,
int dstBegin)
- Copies characters from this string into the destination character array.
The first character to be copied is at index srcBegin
;
the last character to be copied is at index srcEnd-1
(thus the total number of characters to be copied is
srcEnd-srcBegin
). The characters are copied into the
subarray of dst
starting at index dstBegin
and ending at index:
dstbegin + (srcEnd-srcBegin) - 1
- Parameters:
- srcBegin - index of the first character in the string
to copy.
- srcEnd - index after the last character in the string
to copy.
- dst - the destination array.
- dstBegin - the start offset in the destination array.
- Throws: StringIndexOutOfBoundsException
- If srcBegin or srcEnd is out
of range, or if srcBegin is greater than the srcEnd.
hashCode
public int hashCode()
- Returns a hashcode for this string.
- Returns:
- a hash code value for this object.
- Overrides:
- hashCode in class Object
indexOf
public int indexOf(int ch)
- Returns the index within this string of the first occurrence of the
specified character.
- Parameters:
- ch - a character.
- Returns:
- the index of the first occurrence of the character in the
character sequence represented by this object, or
-1
if the character does not occur.
indexOf
public int indexOf(int ch,
int fromIndex)
- Returns the index within this string of the first occurrence of the
specified character, starting the search at the specified index.
- Parameters:
- ch - a character.
- fromIndex - the index to start the search from.
- Returns:
- the index of the first occurrence of the character in the
character sequence represented by this object that is greater
than or equal to
fromIndex
, or -1
if the character does not occur.
indexOf
public int indexOf(String str)
- Returns the index within this string of the first occurrence of the
specified substring.
- Parameters:
- str - any string.
- Returns:
- if the string argument occurs as a substring within this
object, then the index of the first character of the first
such substring is returned; if it does not occur as a
substring,
-1
is returned.
indexOf
public int indexOf(String str,
int fromIndex)
- Returns the index within this string of the first occurrence of the
specified substring, starting at the specified index.
- Parameters:
- str - the substring to search for.
- fromIndex - the index to start the search from.
- Returns:
- If the string argument occurs as a substring within this
object at a starting index no smaller than
fromIndex
, then the index of the first character
of the first such substring is returned. If it does not occur
as a substring starting at fromIndex
or beyond,
-1
is returned.
intern
public native java.lang.String intern()
- Returns a canonical representation for the string object.
If s
and t
are strings such that
s.equals(t)
, it is guaranteed that
s.intern() == t.intern().
- Returns:
- a string that has the same contents as this string, but is
guaranteed to be from a pool of unique strings.
lastIndexOf
public int lastIndexOf(int ch)
- Returns the index within this string of the last occurrence of the
specified character.
The String is searched backwards starting at the last character.
- Parameters:
- ch - a character.
- Returns:
- the index of the last occurrence of the character in the
character sequence represented by this object, or
-1
if the character does not occur.
lastIndexOf
public int lastIndexOf(int ch,
int fromIndex)
- Returns the index within this string of the last occurrence of the
specified character, searching backward starting at the specified index.
- Parameters:
- ch - a character.
- fromIndex - the index to start the search from.
- Returns:
- the index of the last occurrence of the character in the
character sequence represented by this object that is less
than or equal to
fromIndex
, or -1
if the character does not occur before that point.
lastIndexOf
public int lastIndexOf(String str)
- Returns the index within this string of the rightmost occurrence
of the specified substring. The rightmost empty string "" is
considered to occur at the index value
this.length()
.
- Parameters:
- str - the substring to search for.
- Returns:
- if the string argument occurs one or more times as a substring
within this object, then the index of the first character of
the last such substring is returned. If it does not occur as
a substring,
-1
is returned.
lastIndexOf
public int lastIndexOf(String str,
int fromIndex)
- Returns the index within this string of the last occurrence of
the specified substring.
The returned index indicates the start of the substring, and it
must be equal to or less than
fromIndex
.
- Parameters:
- str - the substring to search for.
- fromIndex - the index to start the search from.
- Returns:
- If the string argument occurs one or more times as a substring
within this object at a starting index no greater than
fromIndex
, then the index of the first character of
the last such substring is returned. If it does not occur as a
substring starting at fromIndex
or earlier,
-1
is returned.
length
public int length()
- Returns the length of this string.
The length is equal to the number of 16-bit
Unicode characters in the string.
- Returns:
- the length of the sequence of characters represented by this
object.
regionMatches
public boolean regionMatches(int toffset,
String other,
int ooffset,
int len)
- Tests if two string regions are equal.
If toffset
or ooffset
is negative, or
if toffset
+length
is greater than the
length of this string, or if
ooffset
+length
is greater than the
length of the string argument, then this method returns
false
.
- Parameters:
- toffset - the starting offset of the subregion in this string.
- other - the string argument.
- ooffset - the starting offset of the subregion in the string
argument.
- len - the number of characters to compare.
- Returns:
-
true
if the specified subregion of this string
exactly matches the specified subregion of the string argument;
false
otherwise.
regionMatches
public boolean regionMatches(boolean ignoreCase,
int toffset,
String other,
int ooffset,
int len)
- Tests if two string regions are equal.
If toffset
or ooffset
is negative, or
if toffset
+length
is greater than the
length of this string, or if
ooffset
+length
is greater than the
length of the string argument, then this method returns
false
.
- Parameters:
- ignoreCase - if
true
, ignore case when comparing
characters.
- toffset - the starting offset of the subregion in this
string.
- other - the string argument.
- ooffset - the starting offset of the subregion in the string
argument.
- len - the number of characters to compare.
- Returns:
-
true
if the specified subregion of this string
matches the specified subregion of the string argument;
false
otherwise. Whether the matching is exact
or case insensitive depends on the ignoreCase
argument.
replace
public java.lang.String replace(char oldChar,
char newChar)
- Returns a new string resulting from replacing all occurrences of
oldChar
in this string with newChar
.
If the character oldChar
does not occur in the
character sequence represented by this object, then this string is
returned.
- Parameters:
- oldChar - the old character.
- newChar - the new character.
- Returns:
- a string derived from this string by replacing every
occurrence of
oldChar
with newChar
.
startsWith
public boolean startsWith(String prefix,
int toffset)
- Tests if this string starts with the specified prefix.
- Parameters:
- prefix - the prefix.
- toffset - where to begin looking in the string.
- Returns:
-
true
if the character sequence represented by the
argument is a prefix of the substring of this object starting
at index toffset
; false
otherwise.
startsWith
public boolean startsWith(String prefix)
- Tests if this string starts with the specified prefix.
- Parameters:
- prefix - the prefix.
- Returns:
-
true
if the character sequence represented by the
argument is a prefix of the character sequence represented by
this string; false
otherwise.
- Since:
- JDK1. 0
substring
public java.lang.String substring(int beginIndex)
- Returns a new string that is a substring of this string. The
substring begins at the specified index and extends to the end of
this string.
- Parameters:
- beginIndex - the beginning index, inclusive.
- Returns:
- the specified substring.
- Throws: StringIndexOutOfBoundsException
- if the
beginIndex
is out of range.
substring
public java.lang.String substring(int beginIndex,
int endIndex)
- Returns a new string that is a substring of this string. The
substring begins at the specified
beginIndex
and
extends to the character at index endIndex - 1
.
- Parameters:
- beginIndex - the beginning index, inclusive.
- endIndex - the ending index, exclusive.
- Returns:
- the specified substring.
- Throws: StringIndexOutOfBoundsException
- if the
beginIndex
or the endIndex
is
out of range.
toCharArray
public char[] toCharArray()
- Converts this string to a new character array.
- Returns:
- a newly allocated character array whose length is the length
of this string and whose contents are initialized to contain
the character sequence represented by this string.
toLowerCase
public java.lang.String toLowerCase(Locale locale)
- Converts all of the characters in this
String
to lower
case using the rules of the given locale.
- Parameters:
- locale - use the case transformation rules for this locale
- Returns:
- the String, converted to lowercase.
- Since:
- JDK1.1
- See Also:
- toLowerCase(char), toUpperCase()
toLowerCase
public java.lang.String toLowerCase()
- Converts this
String
to lowercase.
If no character in the string has a different lowercase version,
based on calling the toLowerCase
method defined by
Character
, then the original string is returned.
Otherwise, a new string is allocated, whose length is identical
to this string, and such that each character that has a different
lowercase version is mapped to this lowercase equivalent.
- Returns:
- the string, converted to lowercase.
- See Also:
- toLowerCase(char), toUpperCase()
toString
public java.lang.String toString()
- This object (which is already a string!) is itself returned.
- Returns:
- the string itself.
- Overrides:
- toString in class Object
toUpperCase
public java.lang.String toUpperCase(Locale locale)
- Converts all of the characters in this
String
to upper
case using the rules of the given locale.
- Parameters:
- locale - use the case transformation rules for this locale
- Returns:
- the String, converted to uppercase.
- Since:
- JDK1.1
- See Also:
- toUpperCase(char), toLowerCase(char)
toUpperCase
public java.lang.String toUpperCase()
- Converts this string to uppercase.
If no character in this string has a different uppercase version,
based on calling the toUpperCase
method defined by
Character
, then the original string is returned.
Otherwise, a new string is allocated, whose length is identical
to this string, and such that each character that has a different
uppercase version is mapped to this uppercase equivalent.
- Returns:
- the string, converted to uppercase.
- See Also:
- toUpperCase(char), toLowerCase()
trim
public java.lang.String trim()
- Removes white space from both ends of this string.
All characters that have codes less than or equal to
'\u0020'
(the space character) are considered to be
white space.
- Returns:
- this string, with white space removed from the front and end.
valueOf
public static java.lang.String valueOf(Object obj)
- Returns the string representation of the
Object
argument.
- Parameters:
- obj - an
Object
.
- Returns:
- if the argument is
null
, then a string equal to
"null"
; otherwise, the value of
obj.toString()
is returned.
- See Also:
- toString()
valueOf
public static java.lang.String valueOf(char data)
- Returns the string representation of the
char
array
argument.
- Parameters:
- data - a
char
array.
- Returns:
- a newly allocated string representing the same sequence of
characters contained in the character array argument.
valueOf
public static java.lang.String valueOf(char data,
int offset,
int count)
- Returns the string representation of a specific subarray of the
char
array argument.
The offset
argument is the index of the first
character of the subarray. The count
argument
specifies the length of the subarray.
- Parameters:
- data - the character array.
- offset - the initial offset into the value of the
String
.
- count - the length of the value of the
String
.
- Returns:
- a newly allocated string representing the sequence of
characters contained in the subarray of the character array
argument.
valueOf
public static java.lang.String valueOf(boolean b)
- Returns the string representation of the
boolean
argument.
- Parameters:
- b - a
boolean
.
- Returns:
- if the argument is
true
, a string equal to
"true"
is returned; otherwise, a string equal to
"false"
is returned.
valueOf
public static java.lang.String valueOf(char c)
- Returns the string representation of the
char
* argument.
- Parameters:
- c - a
char
.
- Returns:
- a newly allocated string of length
1
containing
as its single character the argument c
.
valueOf
public static java.lang.String valueOf(int i)
- Returns the string representation of the
int
argument.
The representation is exactly the one returned by the
Integer.toString
method of one argument.
- Parameters:
- i - an
int
.
- Returns:
- a newly allocated string containing a string representation of
the
int
argument.
- See Also:
- toString(int, int)
valueOf
public static java.lang.String valueOf(long l)
- Returns the string representation of the
long
argument.
The representation is exactly the one returned by the
Long.toString
method of one argument.
- Parameters:
- l - a
long
.
- Returns:
- a newly allocated string containing a string representation of
the
long
argument.
- See Also:
- toString(long)
valueOf
public static java.lang.String valueOf(float f)
- Returns the string representation of the
float
argument.
The representation is exactly the one returned by the
Float.toString
method of one argument.
- Parameters:
- f - a
float
.
- Returns:
- a newly allocated string containing a string representation of
the
float
argument.
- See Also:
- toString(float)
valueOf
public static java.lang.String valueOf(double d)
- Returns the string representation of the
double
argument.
The representation is exactly the one returned by the
Double.toString
method of one argument.
- Parameters:
- d - a
double
.
- Returns:
- a newly allocated string containing a string representation of
the
double
argument.
- See Also:
- toString(double)
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