String JDK 1.6)

public char charAt (int index) [Specified in CharSequence]

Returns the char value at the specified index.

Returns the char value at the specified index. An index ranges from 0 to length() - 1. The first char value of the sequence is at index 0, the next at index 1, and so on, as for array indexing.

If the char value specified by the index is a surrogate, the surrogate value is returned.
Returns: the char value at the specified index of this string. The first char value is at index 0.
Parameters:
- index - the index of the char value.
Throws:
- IndexOutOfBoundsException - if the index argument is negative or not less than the length of this string.

public int codePointAt (int index)

Returns the character (Unicode code point) at the specified index.

Returns the character (Unicode code point) at the specified index. The index refers to char values (Unicode code units) and ranges from 0 to String.length() - 1.

If the char value specified at the given index is in the high-surrogate range, the following index is less than the length of this String, and the char value at the following index is in the low-surrogate range, then the supplementary code point corresponding to this surrogate pair is returned. Otherwise, the char value at the given index is returned.
Returns: the code point value of the character at the index
Parameters:
- index - the index to the char values
Throws:
- IndexOutOfBoundsException - if the index argument is negative or not less than the length of this string.
Since: 1.5

public int codePointBefore (int index)

Returns the character (Unicode code point) before the specified index.

Returns the character (Unicode code point) before the specified index. The index refers to char values (Unicode code units) and ranges from 1 to length.

If the char value at (index - 1) is in the low-surrogate range, (index - 2) is not negative, and the char value at (index - 2) is in the high-surrogate range, then the supplementary code point value of the surrogate pair is returned. If the char value at index - 1 is an unpaired low-surrogate or a high-surrogate, the surrogate value is returned.
Returns: the Unicode code point value before the given index.
Parameters:
- index - the index following the code point that should be returned
Throws:
- IndexOutOfBoundsException - if the index argument is less than 1 or greater than the length of this string.
Since: 1.5

public int codePointCount (int beginIndex, int endIndex)

Returns the number of Unicode code points in the specified text range of this String.

Returns the number of Unicode code points in the specified text
range of this String. The text range begins at the
specified beginIndex and extends to the
char at index endIndex - 1. Thus the
length (in chars) of the text range is
endIndex-beginIndex. Unpaired surrogates within
the text range count as one code point each.
Returns: the number of Unicode code points in the specified text range
Parameters:
- beginIndex - the index to the first char of the text range.
- endIndex - the index after the last char of the text range.
Throws:
- IndexOutOfBoundsException - if the beginIndex is negative, or endIndex is larger than the length of this String, or beginIndex is larger than endIndex.
Since: 1.5

public int compareTo (String anotherString)

Compares two strings lexicographically.

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 are equal; compareTo returns 0 exactly when the String.equals(Object) 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 smallest such index; 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()

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.
Parameters:
- anotherString - the String to be compared.

public int compareToIgnoreCase (String str)

Compares two strings lexicographically, ignoring case differences.

Compares two strings lexicographically, ignoring case differences. This method returns an integer whose sign is that of calling compareTo with normalized versions of the strings where case differences have been eliminated by calling Character.toLowerCase(Character.toUpperCase(character)) on each character.

Note that this method does not take locale into account, and will result in an unsatisfactory ordering for certain locales. The java.text package provides collators to allow locale-sensitive ordering.
Returns: a negative integer, zero, or a positive integer as the specified String is greater than, equal to, or less than this String, ignoring case considerations.
Parameters:
- str - the String to be compared.
Since: 1.2
See Also: Collator.compare(String, String),

public 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 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.

Examples:

 "cares".concat("s") returns "caress"
 "to".concat("get").concat("her") returns "together"

Returns: a string that represents the concatenation of this object's characters followed by the string argument's characters.
Parameters:
- str - the String that is concatenated to the end of this String.

public boolean contains (CharSequence s)

Returns true if and only if this string contains the specified sequence of char values.

Returns true if and only if this string contains the specified
sequence of char values.
Returns: true if this string contains s, false otherwise
Parameters:
- s - the sequence to search for
Throws:
- NullPointerException - if s is null
Since: 1.5

public boolean contentEquals (CharSequence cs)

Compares this string to the specified CharSequence.

Compares this string to the specified CharSequence. The result
is true if and only if this String represents the same
sequence of char values as the specified sequence.
Returns: {@code true} if this {@code String} represents the same sequence of char values as the specified sequence, {@code false} otherwise
Parameters:
- cs - The sequence to compare this {@code String} against
Since: 1.5

public boolean contentEquals (StringBuffer sb)

Compares this string to the specified StringBuffer.

Compares this string to the specified StringBuffer. The result
is true if and only if this String represents the same
sequence of characters as the specified StringBuffer.
Returns: {@code true} if this {@code String} represents the same sequence of characters as the specified {@code StringBuffer}, {@code false} otherwise
Parameters:
- sb - The {@code StringBuffer} to compare this {@code String} against
Since: 1.4

publicstatic String copyValueOf (char[] data)

Returns a String that represents the character sequence in the array specified.

Returns a String that represents the character sequence in the
array specified.
Returns: a String that contains the characters of the character array.
Parameters:
- data - the character array.

publicstatic String copyValueOf (char[] data, int offset, int count)

Returns a String that represents the character sequence in the array specified.

Returns a String that represents the character sequence in the
array specified.
Returns: a String that contains the characters of the specified subarray of the character array.
Parameters:
- data - the character array.
- offset - initial offset of the subarray.
- count - length of the subarray.

public boolean endsWith (String suffix)

Tests if this string ends with the specified suffix.

Tests if this string ends with the specified suffix.
Returns: true if the character sequence represented by the argument is a suffix of the character sequence represented by this object; 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 {@link #equals(Object)} method.
Parameters:
- suffix - the suffix.

public boolean equals (Object anObject)

Compares this string to the specified object.

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.
Returns: {@code true} if the given object represents a {@code String} equivalent to this string, {@code false} otherwise
Parameters:
- anObject - The object to compare this {@code String} against
See Also: String.compareTo(String), String.equalsIgnoreCase(String),

public boolean equalsIgnoreCase (String anotherString)

Compares this String to another String, ignoring case considerations.

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 Character.toUpperCase(char) to each character produces the same result
Applying the method Character.toLowerCase(char) to each character produces the same result

Returns: {@code true} if the argument is not {@code null} and it represents an equivalent {@code String} ignoring case; {@code false} otherwise
Parameters:
- anotherString - The {@code String} to compare this {@code String} against
See Also: String.equals(Object),

publicstatic String format (Locale l, String format, Object args)

Returns a formatted string using the specified locale, format string, and arguments.

publicstatic String format (String format, Object args)

Returns a formatted string using the specified format string and arguments.

public byte getBytes ()

Encodes this String into a sequence of bytes using the platform's default charset, storing the result into a new byte array.

The behavior of this method when this string cannot be encoded in the default charset is unspecified. The CharsetEncoder class should be used when more control over the encoding process is required.
Returns: The resultant byte array
Since: JDK1.1

public byte getBytes (Charset charset)

Encodes this String into a sequence of bytes using the given charset, storing the result into a new byte array.

This method always replaces malformed-input and unmappable-character sequences with this charset's default replacement byte array. The CharsetEncoder class should be used when more control over the encoding process is required.
Returns: The resultant byte array
Parameters:
- charset - The {@linkplain java.nio.charset.Charset} to be used to encode the {@code String}
Since: 1.6

@Deprecated

public void ~~getBytes~~ (int srcBegin, int srcEnd, byte[] dst, int dstBegin)

Copies characters from this string into the destination byte array.

public byte getBytes (String charsetName) throws UnsupportedEncodingException

Encodes this String into a sequence of bytes using the named charset, storing the result into a new byte array.

The behavior of this method when this string cannot be encoded in the given charset is unspecified. The CharsetEncoder class should be used when more control over the encoding process is required.
Returns: The resultant byte array
Parameters:
- charsetName - The name of a supported {@linkplain java.nio.charset.Charset charset}
Throws:
- UnsupportedEncodingException - If the named charset is not supported
Since: JDK1.1

pack-private void getChars (char[] dst, int dstBegin)

Copy characters from this string into dst starting at dstBegin.

public void getChars (int srcBegin, int srcEnd, char[] dst, int dstBegin)

Copies characters from this string into the destination character array.

public int hashCode ()

Returns a hash code for this string.

Returns a hash code for this string. The hash code 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.)
Returns: a hash code value for this object.

pack-privatestatic int indexOf (char[] source, int sourceOffset, int sourceCount, char[] target, int targetOffset, int targetCount, int fromIndex)

Code shared by String and StringBuffer to do searches.

public int indexOf (int ch)

Returns the index within this string of the first occurrence of the specified character.

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 (in Unicode
code units) of the first such occurrence is returned. For
values of ch in the range from 0 to 0xFFFF
(inclusive), this is the smallest value k such that:


 this.charAt(k) == ch

is true. For other values of ch, it is the
smallest value k such that:


 this.codePointAt(k) == ch

is true. In either case, if no such character occurs in this
string, then -1 is returned.
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.
Parameters:
- ch - a character (Unicode code point).

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. For values of ch in the range from 0 to 0xFFFF (inclusive), this is the smallest value k such that:

 (this.charAt(k) == ch) && (k >= fromIndex)

is true. For other values of ch, it is the smallest value k such that:

 (this.codePointAt(k) == ch) && (k >= fromIndex)

is true. In either case, 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.

All indices are specified in char values (Unicode code units).
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.
Parameters:
- ch - a character (Unicode code point).
- fromIndex - the index to start the search from.

public int indexOf (String str)

Returns the index within this string of the first occurrence of the specified substring.

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)

is true.
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.
Parameters:
- str - any string.

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.

publicnative String intern ()

Returns a canonical representation for the string object.

public boolean isEmpty ()

Returns true if, and only if, String.length() is 0.

pack-privatestatic int lastIndexOf (char[] source, int sourceOffset, int sourceCount, char[] target, int targetOffset, int targetCount, int fromIndex)

Code shared by String and StringBuffer to do searches.

public int lastIndexOf (int ch)

Returns the index within this string of the last occurrence of the specified character.

Returns the index within this string of the last occurrence of
the specified character. For values of ch in the
range from 0 to 0xFFFF (inclusive), the index (in Unicode code
units) returned is the largest value k such that:


 this.charAt(k) == ch

is true. For other values of ch, it is the
largest value k such that:


 this.codePointAt(k) == ch

is true. In either case, if no such character occurs in this
string, then -1 is returned. The
String is searched backwards starting at the last
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.
Parameters:
- ch - a character (Unicode code point).

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.

Returns the index within this string of the last occurrence of the specified character, searching backward starting at the specified index. For values of ch in the range from 0 to 0xFFFF (inclusive), the index returned is the largest value k such that:

 (this.charAt(k) == ch) && (k <= fromIndex)

is true. For other values of ch, it is the largest value k such that:

 (this.codePointAt(k) == ch) && (k <= fromIndex)

is true. In either case, if no such character occurs in this string at or before position fromIndex, then -1 is returned.

All indices are specified in char values (Unicode code units).
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.
Parameters:
- ch - a character (Unicode code point).
- 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.

public int lastIndexOf (String str)

Returns the index within this string of the rightmost occurrence of the specified substring.

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().
The returned index is the largest value k such that


 this.startsWith(str, k)

is true.
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.
Parameters:
- str - the substring to search for.

public int lastIndexOf (String str, int fromIndex)

Returns the index within this string of the last occurrence of the specified substring, searching backward starting at the specified index.

public int length () [Specified in CharSequence]

Returns the length of this string.

public boolean matches (String regex)

Tells whether or not this string matches the given regular expression.

public int offsetByCodePoints (int index, int codePointOffset)

Returns the index within this String that is offset from the given index by codePointOffset code points.

Returns the index within this String that is
offset from the given index by
codePointOffset code points. Unpaired surrogates
within the text range given by index and
codePointOffset count as one code point each.
Returns: the index within this String
Parameters:
- index - the index to be offset
- codePointOffset - the offset in code points
Throws:
- IndexOutOfBoundsException - if index is negative or larger then the length of this String, or if codePointOffset is positive and the substring starting with index has fewer than codePointOffset code points, or if codePointOffset is negative and the substring before index has fewer than the absolute value of codePointOffset code points.
Since: 1.5

public boolean regionMatches (boolean ignoreCase, int toffset, String other, int ooffset, int len)

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 argument.
ignoreCase is false and 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))

and:

 Character.toUpperCase(this.charAt(toffset+k)) !=
         Character.toUpperCase(other.charAt(ooffset+k))

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.
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.

public boolean regionMatches (int toffset, String other, int ooffset, int len)

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 identical character sequences. 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 argument.
There is some nonnegative integer k less than len such that: this.charAt(toffset+k) != other.charAt(ooffset+k)

Returns: true if the specified subregion of this string exactly matches the specified subregion of the string argument; false otherwise.
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.

public 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 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.

Examples:

 "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)

Returns: a string derived from this string by replacing every occurrence of oldChar with newChar.
Parameters:
- oldChar - the old character.
- newChar - the new character.

public String replace (CharSequence target, CharSequence replacement)

Replaces each substring of this string that matches the literal target sequence with the specified literal replacement sequence.

Replaces each substring of this string that matches the literal target
sequence with the specified literal replacement sequence. The
replacement proceeds from the beginning of the string to the end, for
example, replacing "aa" with "b" in the string "aaa" will result in
"ba" rather than "ab".
Returns: The resulting string
Parameters:
- target - The sequence of char values to be replaced
- replacement - The replacement sequence of char values
Throws:
- NullPointerException - if target or replacement is null.
Since: 1.5

public String replaceAll (String regex, String replacement)

Replaces each substring of this string that matches the given regular expression with the given replacement.

public String replaceFirst (String regex, String replacement)

Replaces the first substring of this string that matches the given regular expression with the given replacement.

public String split (String regex)

Splits this string around matches of the given regular expression.

Regex	Result
:	`{ "boo", "and", "foo" }`
o	`{ "b", "", ":and:f" }`

public String split (String regex, int limit)

Splits this string around matches of the given regular expression.

Regex	Limit	Result
:	2	`{ "boo", "and:foo" }`
:	5	`{ "boo", "and", "foo" }`
:	-2	`{ "boo", "and", "foo" }`
o	5	`{ "b", "", ":and:f", "", "" }`
o	-2	`{ "b", "", ":and:f", "", "" }`
o	0	`{ "b", "", ":and:f" }`

public boolean startsWith (String prefix)

Tests if this string starts with the specified prefix.

Tests if this string starts with the specified prefix.
Returns: true if the character sequence represented by the argument is a prefix of the character sequence represented by this string; 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 {@link #equals(Object)} method.
Parameters:
- prefix - the prefix.
Since: 1. 0

public boolean startsWith (String prefix, int toffset)

Tests if the substring of this string beginning at the specified index starts with the specified prefix.

Tests if the substring of this string beginning at the
specified index starts with the specified prefix.
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 object; otherwise the result is the same as the result of the expression

          this.substring(toffset).startsWith(prefix)

Parameters:
- prefix - the prefix.
- toffset - where to begin looking in this string.

public CharSequence subSequence (int beginIndex, int endIndex) [Specified in CharSequence]

Returns a new character sequence that is a subsequence of this sequence.

public String substring (int beginIndex)

Returns a new string that is a substring of this string.

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.

Examples:

 "unhappy".substring(2) returns "happy"
 "Harbison".substring(3) returns "bison"
 "emptiness".substring(9) returns "" (an empty string)

Returns: the specified substring.
Parameters:
- beginIndex - the beginning index, inclusive.
Throws:
- IndexOutOfBoundsException - if beginIndex is negative or larger than the length of this String object.

public String substring (int beginIndex, int endIndex)

Returns a new string that is a substring of this string.

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.

Examples:

 "hamburger".substring(4, 8) returns "urge"
 "smiles".substring(1, 5) returns "mile"

Returns: the specified substring.
Parameters:
- beginIndex - the beginning index, inclusive.
- endIndex - the ending index, exclusive.
Throws:
- IndexOutOfBoundsException - if the beginIndex is negative, or endIndex is larger than the length of this String object, or beginIndex is larger than endIndex.

public char toCharArray ()

Converts this string to a new character array.

public String toLowerCase ()

Converts all of the characters in this String to lower case using the rules of the default locale.

Converts all of the characters in this String to lower case using the rules of the default locale. This is equivalent to calling toLowerCase(Locale.getDefault()).

Note: This method is locale sensitive, and may produce unexpected results if used for strings that are intended to be interpreted locale independently. Examples are programming language identifiers, protocol keys, and HTML tags. For instance, "TITLE".toLowerCase() in a Turkish locale returns "tıtle", where 'ı' is the LATIN SMALL LETTER DOTLESS I character. To obtain correct results for locale insensitive strings, use toLowerCase(Locale.ENGLISH).

Returns: the String, converted to lowercase.
See Also: String.toLowerCase(Locale),

public String toLowerCase (Locale locale)

Converts all of the characters in this String to lower case using the rules of the given Locale.

Converts all of the characters in this String to lower case using the rules of the given Locale. Case mapping is based on the Unicode Standard version specified by the Character class. Since case mappings are not always 1:1 char mappings, the resulting String may be a different length than the original String.

Examples of lowercase mappings are in the following table:

Language Code of Locale Upper Case Lower Case Description

tr (Turkish) \u0130 \u0069 capital letter I with dot above -> small letter i

tr (Turkish) \u0049 \u0131 capital letter I -> small letter dotless i

(all) French Fries french fries lowercased all chars in String

(all) capiota capchi captheta capupsil capsigma iota chi theta upsilon sigma lowercased all chars in String

Returns: the String, converted to lowercase.
Parameters:
- locale - use the case transformation rules for this locale
Since: 1.1
See Also: String.toLowerCase(), String.toUpperCase(), String.toUpperCase(Locale),

Language Code of Locale	Upper Case	Lower Case	Description
tr (Turkish)	\u0130	\u0069	capital letter I with dot above -> small letter i
tr (Turkish)	\u0049	\u0131	capital letter I -> small letter dotless i
(all)	French Fries	french fries	lowercased all chars in String
(all)			lowercased all chars in String

public String toString () [Specified in CharSequence]

This object (which is already a string!) is itself returned.

public String toUpperCase ()

Converts all of the characters in this String to upper case using the rules of the default locale.

Converts all of the characters in this String to upper case using the rules of the default locale. This method is equivalent to toUpperCase(Locale.getDefault()).

Note: This method is locale sensitive, and may produce unexpected results if used for strings that are intended to be interpreted locale independently. Examples are programming language identifiers, protocol keys, and HTML tags. For instance, "title".toUpperCase() in a Turkish locale returns "TİTLE", where 'İ' is the LATIN CAPITAL LETTER I WITH DOT ABOVE character. To obtain correct results for locale insensitive strings, use toUpperCase(Locale.ENGLISH).

Returns: the String, converted to uppercase.
See Also: String.toUpperCase(Locale),

public String toUpperCase (Locale locale)

Converts all of the characters in this String to upper case using the rules of the given Locale.

Converts all of the characters in this String to upper case using the rules of the given Locale. Case mapping is based on the Unicode Standard version specified by the Character class. Since case mappings are not always 1:1 char mappings, the resulting String may be a different length than the original String.

Examples of locale-sensitive and 1:M case mappings are in the following table.

Language Code of Locale Lower Case Upper Case Description

tr (Turkish) \u0069 \u0130 small letter i -> capital letter I with dot above

tr (Turkish) \u0131 \u0049 small letter dotless i -> capital letter I

(all) \u00df \u0053 \u0053 small letter sharp s -> two letters: SS

(all) Fahrvergnügen FAHRVERGNÜGEN

Returns: the String, converted to uppercase.
Parameters:
- locale - use the case transformation rules for this locale
Since: 1.1
See Also: String.toUpperCase(), String.toLowerCase(), String.toLowerCase(Locale),

Language Code of Locale	Lower Case	Upper Case	Description
tr (Turkish)	\u0069	\u0130	small letter i -> capital letter I with dot above
tr (Turkish)	\u0131	\u0049	small letter dotless i -> capital letter I
(all)	\u00df	\u0053 \u0053	small letter sharp s -> two letters: SS
(all)	Fahrvergnügen	FAHRVERGNÜGEN

public String trim ()

Returns a copy of the string, with leading and trailing whitespace omitted.

publicstatic String valueOf (boolean b)

Returns the string representation of the boolean argument.

Returns the string representation of the boolean argument.
Returns: if the argument is true, a string equal to "true" is returned; otherwise, a string equal to "false" is returned.
Parameters:
- b - a boolean.

publicstatic String valueOf (char c)

Returns the string representation of the char argument.

Returns the string representation of the char
argument.
Returns: a string of length 1 containing as its single character the argument c.
Parameters:
- c - a char.

publicstatic String valueOf (char[] data)

Returns the string representation of the char array argument.

Returns the string representation of the char array
argument. The contents of the character array are copied; subsequent
modification of the character array does not affect the newly
created string.
Returns: a newly allocated string representing the same sequence of characters contained in the character array argument.
Parameters:
- data - a char array.

publicstatic 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. The contents of the subarray are copied; subsequent modification of the character array does not affect the newly created string.
Returns: a string representing the sequence of characters contained in the subarray of the character array argument.
Parameters:
- data - the character array.
- offset - the initial offset into the value of the String.
- count - the length of the value of the String.
Throws:
- IndexOutOfBoundsException - if offset is negative, or count is negative, or offset+count is larger than data.length.

publicstatic 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.
Returns: a string representation of the double argument.
Parameters:
- d - a double.
See Also: Double.toString(double),

publicstatic 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.
Returns: a string representation of the float argument.
Parameters:
- f - a float.
See Also: Float.toString(float),

publicstatic 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.
Returns: a string representation of the int argument.
Parameters:
- i - an int.
See Also: Integer.toString(int, int),

publicstatic 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.
Returns: a string representation of the long argument.
Parameters:
- l - a long.
See Also: Long.toString(long),

publicstatic String valueOf (Object obj)

Returns the string representation of the Object argument.

Returns the string representation of the Object argument.
Returns: if the argument is null, then a string equal to "null"; otherwise, the value of obj.toString() is returned.
Parameters:
- obj - an Object.
See Also: Object.toString(),