class templates:
functions:
member functions:
member constants:
non-member overloads:
<a href="/reference/string/string/operator<operator&& (string)I'm a new cocoa programmer and am creating a
to handle some of my interface elements. I dug around in some bundles and have noticed that people are loading predefined chunks of html saved in files in the application bundle. These files take the form of standard html with tokens such as @pageTitle defined within them. At runtime these tokens have been replaced with values from other parts of the program.
What's the best way to do this replacement?.
Try NSMutableString's replaceOccurrencesOfString:withString:options:range: method.
NSString * foo = @"foo";
NSString * formattedFoo = @"[HTML_REMOVED]Foo![HTML_REMOVED]";
NSMutableString * templateHTML = [[NSMutableString alloc] initWithContentsOfFile:@"template.html"];
[templateHTML replaceOccurrencesOfString:foo withString:formattedFoo
options:NSCaseInsensitiveSearch
range:NSMakeRange(0, [templateHTML length])];
[templateHTML writeToFile:@"finished.html"];
[templateHTML release];
I'm reading a text file into an NSString. To replace all of the newlines in the resulting string with spaces
(assuming the original instance
string is already autoreleased):
NSMutableString *mString = [string mutableCopy];
[mString replaceOccurrencesOfString:@"\n" withString:@" " options:NSCaseInsensitiveSearch range:(NSRange){0,[mString length]}];
string = [ NSString stringWithString: [ mstring autorelease ]];
On a pre-10.2 system when using
replaceOccurrencesOfString:withString:options:range:
(unsigned int)replaceOccurrencesOfString:(NSString )target withString:(NSString )replacement options:(unsigned)opts range:(NSRange)searchRange
with a NSMutableString. Error message when compiling:
"warning: NSMutableString does not respond to replaceOccurrencesOfString:withString:options:range:"
-(NSMutableString*)getPattern
NSRange rangeH;
NSMutableString * patternS
patternString=[NSMutableString
stringWithFormat: @"%@%@%@ %@%@%@ %@%@%@ %@%@%@ %@%@%@",
[t11 stringValue],[t21 stringValue],[t31 stringValue],
[t12 stringValue],[t22 stringValue],[t32 stringValue],
[t13 stringValue],[t23 stringValue],[t33 stringValue],
[t14 stringValue],[t24 stringValue],[t34 stringValue],
[t15 stringValue],[t25 stringValue],[t35 stringValue]
printf("%s\n", [patternString UTF8String]);
rangeH = NSMakeRange(0, [patternString length]);
[patternString replaceOccurrencesOfString:@"h" withString:@"G" options:NSLiteralSearch range:rangeH];
return patternS
I have compiled similar code using 10.2 (works fine as expected) but when the compiled application is launched on a 10.1 system it does not work.
I thought that the runtime environment was supposed to recognise that the framework of the compiled code is not compatible ("major framework vs. minor framework changes etc") and that the incompatible framework is then used instead of the outdated framework (in this case the framework is the cocoa framework).
I am using 10.4.9 at the moment, and "replaceOccurrencesOfString" also doesn't work, giving a compile error and crashing the programme.
PCF: -replaceOccurrencesOfString:withString:options:range: is not available on Mac OS X 10.1 it was added in 10.2. If you launch on 10.1, it has no idea what this method is, and so it dies.
As for 10.4.9, if you're getting a compile error with an Objective-C message dispatch, your syntax is wrong. If it were just an unrecognized selector, you'd get a warning and compilation would continue.听短文，选出正确答案。
1. Mid-autumn Festival is one of the most important festivals in
A. England
B. the USA
2. Mid-autumn Festival comes in
B. May or Oc_百度作业帮
听短文，选出正确答案。
1. Mid-autumn Festival is one of the most important festivals in
A. England
B. the USA
2. Mid-autumn Festival comes in
B. May or Oc
听短文，选出正确答案。
1. Mid-autumn Festival is one of the most important festivals in&&&&&&&&&
A. England&&&&&&&&&& B. the USA&&&&&&&&&&C. China
2. Mid-autumn Festival comes in&&&&&&&&&
A. August&&&&&&&&&&&&B. May or October.&&&&C. September
3. People often eat _____ on that day.
A. dumplings&&&&&&&& B. pies&&&&&&&&&&&&&&C. mooncakes
4. People like to _____ in the open air on that night.
A. play&&&&&&&&&&&&&B. watch the moon&&&& C. make mooncakes
5. They _____ for the moon.
A. dance&&&&&&&&&&&& B. sing songs&&&&&&&& C. play games
1. C&& 2. C&&&&3. C&& 4. B&&&&5. BString (MID Profile)
Use is subject to . Your use of this web site or any of its contents or software indicates your agreement to be bound by these License Terms.Copyright & 2006 Sun Microsystems, Inc. and Motorola, Inc. All rights reserved.
MID Profile
Class String
java.lang.String
public final class Stringextends
The String class represents character strings. All
string literals in Java programs, such as "abc", are
implemented as instances of this class.
S 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
concatenation 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.
JDK1.0, CLDC 1.0
See Also:,
&&&&&&&&&&Initializes a newly created String object so that it
represents an empty character sequence.
(byte[]&bytes)
&&&&&&&&&&Construct a new String by converting the specified array
of bytes using the platform's default character encoding.
(byte[]&bytes,
&&&&&&&&&&Construct a new String by converting the specified
subarray of bytes using the platform's default character encoding.
(byte[]&bytes,
&&&&&&&&&&Construct a new String by converting the specified
subarray of bytes using the specified character encoding.
(byte[]&bytes,
&&&&&&&&&&Construct a new String by converting the specified array
of bytes using the specified character encoding.
(char[]&value)
&&&&&&&&&&Allocates a new String so that it represents the
sequence of characters currently contained in the character array
(char[]&value,
int&offset,
int&count)
&&&&&&&&&&Allocates a new String that contains characters from
a subarray of the character array argument.
&&&&&&&&&&Initializes a newly created String object so that it
represents the same sequence of charac in other
words, the newly created string is a copy of the argument string.
&&&&&&&&&&Allocates a new string that contains the sequence of characters
currently contained in the string buffer argument.
(int&index)
&&&&&&&&&&Returns the character at the specified index.
(&anotherString)
&&&&&&&&&&Compares two strings lexicographically.
&&&&&&&&&&Concatenates the specified string to the end of this string.
&&&&&&&&&&Tests if this string ends with the specified suffix.
(&anObject)
&&&&&&&&&&Compares this string to the specified object.
(&anotherString)
&&&&&&&&&&Compares this String to another String,
ignoring case considerations.
&&&&&&&&&&Convert this String into bytes according to the platform's
default character encoding, storing the result into a new byte array.
&&&&&&&&&&Convert this String into bytes according to the specified
character encoding, storing the result into a new byte array.
(int&srcBegin,
int&srcEnd,
char[]&dst,
int&dstBegin)
&&&&&&&&&&Copies characters from this string into the destination character
&&&&&&&&&&Returns a hashcode for this string.
&&&&&&&&&&Returns the index within this string of the first occurrence of the
specified character.
int&fromIndex)
&&&&&&&&&&Returns the index within this string of the first occurrence of the
specified character, starting the search at the specified index.
&&&&&&&&&&Returns the index within this string of the first occurrence of the
specified substring.
int&fromIndex)
&&&&&&&&&&Returns the index within this string of the first occurrence of the
specified substring, starting at the specified index.
&&&&&&&&&&Returns a canonical representation for the string object.
&&&&&&&&&&Returns the index within this string of the last occurrence of the
specified character.
int&fromIndex)
&&&&&&&&&&Returns the index within this string of the last occurrence of the
specified character, searching backward starting at the specified
&&&&&&&&&&Returns the length of this string.
(boolean&ignoreCase,
int&toffset,
int&ooffset,
&&&&&&&&&&Tests if two string regions are equal.
(char&oldChar,
char&newChar)
&&&&&&&&&&Returns a new string resulting from replacing all occurrences of
oldChar in this string with newChar.
&&&&&&&&&&Tests if this string starts with the specified prefix.
int&toffset)
&&&&&&&&&&Tests if this string starts with the specified prefix beginning
at the specified index.
(int&beginIndex)
&&&&&&&&&&Returns a new string that is a substring of this string.
(int&beginIndex,
int&endIndex)
&&&&&&&&&&Returns a new string that is a substring of this string.
&&&&&&&&&&Converts this string to a new character array.
&&&&&&&&&&Converts all of the characters in this String to lower case.
&&&&&&&&&&This object (which is already a string!) is itself returned.
&&&&&&&&&&Converts all of the characters in this String to upper case.
&&&&&&&&&&Removes white space from both ends of this string.
(boolean&b)
&&&&&&&&&&Returns the string representation of the boolean argument.
&&&&&&&&&&Returns the string representation of the char
(char[]&data)
&&&&&&&&&&Returns the string representation of the char array
(char[]&data,
int&offset,
int&count)
&&&&&&&&&&Returns the string representation of a specific subarray of the
char array argument.
(double&d)
&&&&&&&&&&Returns the string representation of the double argument.
&&&&&&&&&&Returns the string representation of the float argument.
&&&&&&&&&&Returns the string representation of the int argument.
&&&&&&&&&&Returns the string representation of the long argument.
&&&&&&&&&&Returns the string representation of the Object argument.
public String()
Initializes a newly created String object so that it
represents an empty character sequence.
public String(&value)
Initializes a newly created String object so that it
represents the same sequence of charac in other
words, the newly created string is a copy of the argument string.
Parameters:value - a String.
public String(char[]&value)
Allocates a new String so that it represents the
sequence of characters currently contained in the character array
argument. The contents of the charac subsequent
modification of the character array does not affect the newly created
Parameters:value - the initial value of the string.
- if value is null.
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. The contents of the subsequent
modification of the character array does not affect the newly
created string.
Parameters:value - array that is the source of characters.offset - the initial offset.count - the length.
- if the offset
and count arguments index characters outside
the bounds of the value array.
- if value is
public String(byte[]&bytes,
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 charactersoff - Index of the first byte to convertlen - Number of bytes to convertenc - The name of a character encoding
- If the named encoding is not supportedSince:
public String(byte[]&bytes,
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 charactersenc - The name of a supported character encoding
- If the named encoding is not supportedSince:
public String(byte[]&bytes,
Construct a new String by converting the specified
subarray of bytes using the platform's default character encoding.
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 charactersoff - Index of the first byte to convertlen - Number of bytes to convertSince:
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 charactersSince:
public String(&buffer)
Allocates a new string that contains the sequence of characters
currently contained in the string buffer argument. The contents of
the stri subsequent modification of the string
buffer does not affect the newly created string.
Parameters:buffer - a StringBuffer.
- If buffer is
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
public char charAt(int&index)
Returns the character at the specified index. An index ranges
from 0 to length() - 1. The first character
of the sequence is at index 0, the next at index
1, and so on, as for array indexing.
Parameters:index - the index of the character.
Returns:the character at the specified index of this string.
The first character is at index 0.
- if the index
argument is negative or not less than the length of this
public void getChars(int&srcBegin,
int&srcEnd,
char[]&dst,
int&dstBegin)
Copies characters from this string into the destination character
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.
- If any of the following
srcBegin is negative.
srcBegin is greater than srcEnd
srcEnd is greater than the length of this
dstBegin is negative
dstBegin+(srcEnd-srcBegin) is larger than
dst.length
- if dst is null
public byte[] getBytes(&enc)
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
- If the named encoding is not supportedSince:
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:
public boolean equals(&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.
Overrides: in class
Parameters:anObject - the object to compare this String
Returns:true if the String
false otherwise.See Also:,
equalsIgnoreCase
public boolean equalsIgnoreCase(&anotherString)
Compares this String to another String,
ignoring case considerations.
Two strings are considered equal
ignoring case if they are of the same length, and corresponding
characters in the two strings are equal ignoring case.
Two characters c1 and c2 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
to each character produces the same result.
Applying the method
to each character produces the same result.
Parameters:anotherString - the String to compare this
String against.
Returns:true if the argument is not null
and the Strings are equal,
false otherwise.See Also:,
public int compareTo(&anotherString)
Compares two strings lexicographically.
The comparison is based on the Unicode value of each character in
the strings. The character sequence represented by this
String object is compared lexicographically to the
character sequence represented by the argument string. The result is
a negative integer if this String object
lexicographically precedes the argument string. The result is a
positive integer if this String object lexicographically
follows the argument string. The result is zero if the strings
compareTo returns 0 exactly when
method would return true.
This is the definition of lexicographic ordering. If two strings are
different, then either they have different characters at some index
that is a valid index for both strings, or their lengths are different,
or both. If they have different characters at one or more index
positions, let k be the then the string
whose character at position k has the smaller value, as
determined by using the < operator, lexicographically precedes the
other string. In this case, compareTo returns the
difference of the two character values at position k in
the two string -- that is, the value:
this.charAt(k)-anotherString.charAt(k)
If there is no index position at which they differ, then the shorter
string lexicographically precedes the longer string. In this case,
compareTo returns the difference of the lengths of the
strings -- that is, the value:
this.length()-anotherString.length()
Parameters:anotherString - the String to be compared.
Returns:the value 0 if the argument string is equal to
a value less than 0 if this string
is lexicographically less than and a
value greater than 0 if this string is
lexicographically greater than the string argument.
- if anotherString
regionMatches
public boolean regionMatches(boolean&ignoreCase,
int&toffset,
int&ooffset,
Tests if two string regions are equal.
A substring of this String object is compared to a substring
of the argument other. The result is true if these
substrings represent character sequences that are the same, ignoring
case if and only if ignoreCase is true. The substring of
this String object to be compared begins at index
toffset and has length len. The substring of
other to be compared begins at index ooffset and
has length len. The result is false if and only if
at least one of the following is true:
toffset is negative.
ooffset is negative.
toffset+len is greater than the length of this
String object.
ooffset+len is greater than the length of the other
There is some nonnegative integer k less than len
such that:
this.charAt(toffset+k) != other.charAt(ooffset+k)
ignoreCase is true and there is some nonnegative
integer k less than len such that:
Character.toLowerCase(this.charAt(toffset+k)) !=
Character.toLowerCase(other.charAt(ooffset+k))
Character.toUpperCase(this.charAt(toffset+k)) !=
Character.toUpperCase(other.charAt(ooffset+k))
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
false otherwise. Whether the matching is exact
or case insensitive depends on the ignoreCase
startsWith
public boolean startsWith(&prefix,
int&toffset)
Tests if this string starts with the specified prefix beginning
at the specified index.
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.
The result is false if toffset is
negative or greater than the length of this
String otherwise the result is the same
as the result of the expression
this.subString(toffset).startsWith(prefix)
- if prefix is
startsWith
public boolean startsWith(&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
false otherwise.
Note also that true will be returned if the
argument is an empty string or is equal to this
String object as determined by the
- if prefix is
null.Since:
public boolean endsWith(&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
false otherwise. Note that the
result will be true if the argument is the
empty string or is equal to this String object
as determined by the
- if suffix is
public int hashCode()
Returns a hashcode for this string. The hashcode for a
String object is computed as
s[0]*31^(n-1) + s[1]*31^(n-2) + ... + s[n-1]
using int arithmetic, where s[i] is the
ith character of the string, n is the length of
the string, and ^ indicates exponentiation.
(The hash value of the empty string is zero.)
Overrides: in class
Returns:a hash code value for this object.See Also:,
public int indexOf(int&ch)
Returns the index within this string of the first occurrence of the
specified character. If a character with value ch occurs
in the character sequence represented by this String
object, then the index of the first such occurrence is returned --
that is, the smallest value k such that:
this.charAt(k) == ch
is true. If no such character occurs in this string,
then -1 is returned.
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.
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.
If a character with value ch occurs in the character
sequence represented by this String object at an index
no smaller than fromIndex, then the index of the first
such occurrence is returned--that is, the smallest value k
such that:
(this.charAt(k) == ch) && (k >= fromIndex)
is true. If no such character occurs in this string at or after
position fromIndex, then -1 is returned.
There is no restriction on the value of fromIndex. If it
is negative, it has the same effect as if it were zero: this entire
string may be searched. If it is greater than the length of this
string, it has the same effect as if it were equal to the length of
this string: -1 is returned.
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.
lastIndexOf
public int lastIndexOf(int&ch)
Returns the index within this string of the last occurrence of the
specified character. That is, the index returned is the largest
value k such that:
this.charAt(k) == ch
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. That is, the index returned is the largest value k
such that:
(this.charAt(k) == ch) && (k <= fromIndex)
Parameters:ch - a character.fromIndex - the index to start the search from. There is no
restriction on the value of fromIndex. If it is
greater than or equal to the length of this string, it has
the same effect as if it were equal to one less than the
length of this string: this entire string may be searched.
If it is negative, it has the same effect as if it were -1:
-1 is returned.
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.
public int indexOf(&str)
Returns the index within this string of the first occurrence of the
specified substring. The integer returned is the smallest value
k such that:
this.startsWith(str, k)
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 s if it does not occur as a
substring, -1 is returned.
- if str is
public int indexOf(&str,
int&fromIndex)
Returns the index within this string of the first occurrence of the
specified substring, starting at the specified index. The integer
returned is the smallest value k such that:
this.startsWith(str, k) && (k >= fromIndex)
There is no restriction on the value of fromIndex. If
it is negative, it has the same effect as if it were zero: this entire
string may be searched. If it is greater than the length of this
string, it has the same effect as if it were equal to the length of
this string: -1 is returned.
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.
- if str is
substring(int&beginIndex)
Returns a new string that is a substring of this string. The
substring begins with the character at the specified index and
extends to the end of this string.
"unhappy".substring(2) returns "happy"
"Harbison".substring(3) returns "bison"
"emptiness".substring(9) returns "" (an empty string)
Parameters:beginIndex - the beginning index, inclusive.
Returns:the specified substring.
beginIndex is negative or larger than the
length of this String object.
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.
Thus the length of the substring is endIndex-beginIndex.
"hamburger".substring(4, 8) returns "urge"
"smiles".substring(1, 5) returns "mile"
Parameters:beginIndex - the beginning index, inclusive.endIndex - the ending index, exclusive.
Returns:the specified substring.
beginIndex is negative, or
endIndex is larger than the length of
this String object, or
beginIndex is larger than
concat(&str)
Concatenates the specified string to the end of this string.
If the length of the argument string is 0, then this
String object is returned. Otherwise, a new
String object is created, representing a character
sequence that is the concatenation of the character sequence
represented by this String object and the character
sequence represented by the argument string.
"cares".concat("s") returns "caress"
"to".concat("get").concat("her") returns "together"
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.
- if str is
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 String object,
then a reference to this String object is returned.
Otherwise, a new String object is created that
represents a character sequence identical to the character sequence
represented by this String object, except that every
occurrence of oldChar is replaced by an occurrence
of newChar.
"mesquite in your cellar".replace('e', 'o')
returns "mosquito in your collar"
"the war of baronets".replace('r', 'y')
returns "the way of bayonets"
"sparring with a purple porpoise".replace('p', 't')
returns "starring with a turtle tortoise"
"JonL".replace('q', 'x') returns "JonL" (no change)
Parameters:oldChar - the old character.newChar - the new character.
Returns:a string derived from this string by replacing every
occurrence of oldChar with newChar.
toLowerCase
toLowerCase()
Converts all of the characters in this String to lower case.
Returns:the String, converted to lowercase.See Also:,
toUpperCase
toUpperCase()
Converts all of the characters in this String to upper case.
Returns:the String, converted to uppercase.See Also:,
Removes white space from both ends of this string.
If this String object represents an empty character
sequence, or the first and last characters of character sequence
represented by this String object both have codes
greater than '&#92;u0020' (the space character), then a
reference to this String object is returned.
Otherwise, if there is no character with a code greater than
'&#92;u0020' in the string, then a new
String object representing an empty string is created
and returned.
Otherwise, let k be the index of the first character in the
string whose code is greater than '&#92;u0020', and let
m be the index of the last character in the string whose code
is greater than '&#92;u0020'. A new String
object is created, representing the substring of this string that
begins with the character at index k and ends with the
character at index m-that is, the result of
this.substring(k,&m+1).
This method may be used to trim whitespace from the beginning and end
in fact, it trims all ASCII control characters as well.
Returns:this string, with white space removed from the front and end.
toString()
This object (which is already a string!) is itself returned.
Overrides: in class
Returns:the string itself.
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.
public static
valueOf(&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:
public static
valueOf(char[]&data)
Returns the string representation of the char array
argument. The contents of the charac subsequent
modification of the character array does not affect the newly
created string.
Parameters:data - a char array.
Returns:a newly allocated string representing the same sequence of
characters contained in the character array argument.
public static
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. The contents of the subarray
subsequent modification of the character array does not
affect the newly created string.
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
- if data is
- if offset is
negative, or count is negative, or
offset+count is larger than
data.length.
public static
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" otherwise, a string equal to
"false" is returned.
public static
valueOf(char&c)
Returns the string representation of the char
Parameters:c - a char.
Returns:a newly allocated string of length 1 containing
as its single character the argument c.
public static
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:
public static
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:
public static
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.Since:
public static
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.Since:
Returns a canonical representation for the string object.
A pool of strings, initially empty, is maintained privately by the
class String.
When the intern method is invoked, if the pool already contains a
string equal to this String object as determined by
method, then the string from the pool is
returned. Otherwise, this String object is added to the
pool and a reference to this String object is returned.
It follows that for any two strings s and t,
s.intern()&==&t.intern() is true
if and only if s.equals(t) is true.
All literal strings and string-valued constant expressions are
interned. String literals are defined in Section 3.10.5 of the
Returns:a string that has the same contents as this string, but is
guaranteed to be from a pool of unique strings.Since:
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