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public final class

String

extends Object
implements Serializable CharSequence Comparable<T>
java.lang.Object
   ↳ java.lang.String

Class Overview

An immutable sequence of characters/code units (chars). A String is represented by array of UTF-16 values, such that Unicode supplementary characters (code points) are stored/encoded as surrogate pairs via Unicode code units (char)

See Also

Summary

Constants
Comparator<String> CASE_INSENSITIVE_ORDER
Public Constructors
String()
Returns an empty string.
String(byte[] data)
Converts the byte array to a String using the default encoding as specified by the file.encoding system property.
String(byte[] data, int high)
This constructor is deprecated. Use String(byte[]) or String(byte[], String) instead
String(byte[] data, int start, int length)
Converts the byte array to a String using the default encoding as specified by the file.encoding system property.
String(byte[] data, int high, int start, int length)
This constructor is deprecated. Use String(byte[], int, int) instead
String(byte[] data, int start, int length, String encoding)
Converts the byte array to a String using the specified encoding.
String(byte[] data, String encoding)
Converts the byte array to a String using the specified encoding.
String(char[] data)
Initializes this String to contain the characters in the specified character array.
String(char[] data, int start, int length)
Initializes this String to contain the specified characters in the character array.
String(String string)
Creates a string that is a copy of another string
String(StringBuffer stringbuffer)
Creates a string from the contents of a StringBuffer.
String(int[] codePoints, int offset, int count)

Constructs a String from the sub-array of Unicode code points.

String(StringBuilder sb)

Constructs a String from a StringBuilder.

Public Methods
char charAt(int index)
Returns the character at the specified offset in this String.
int codePointAt(int index)

Retrieves the Unicode code point value at the index.

int codePointBefore(int index)

Retrieves the Unicode code point value that precedes the index.

int codePointCount(int beginIndex, int endIndex)

Calculates the number of Unicode code points between beginIndex and endIndex.

int compareTo(String string)
Compares the specified String to this String using the Unicode values of the characters.
int compareToIgnoreCase(String string)
Compare the receiver to the specified String to determine the relative ordering when the case of the characters is ignored.
String concat(String string)
Concatenates this String and the specified string.
boolean contains(CharSequence cs)

Determines if this String contains the sequence of characters in the CharSequence passed.

boolean contentEquals(StringBuffer strbuf)
Returns whether the characters in the StringBuffer strbuf are the same as those in this String.
boolean contentEquals(CharSequence cs)

Compares a CharSequence to this String to determine if their contents are equal.

static String copyValueOf(char[] data)
Creates a new String containing the characters in the specified character array.
static String copyValueOf(char[] data, int start, int length)
Creates a new String containing the specified characters in the character array.
boolean endsWith(String suffix)
Compares the specified string to this String to determine if the specified string is a suffix.
boolean equals(Object object)
Compares the specified object to this String and returns true if they are equal.
boolean equalsIgnoreCase(String string)
Compares the specified String to this String ignoring the case of the characters and returns true if they are equal.
static String format(String format, Object... args)
Returns a printf-style formatted string, using the supplied format and arguments.
static String format(Locale loc, String format, Object... args)
Returns a printf-style formatted string, using the supplied format and arguments, accordingly to the specified locale.
void getBytes(int start, int end, byte[] data, int index)
This method is deprecated. Use getBytes() or getBytes(String)
byte[] getBytes()
Converts this String to a byte encoding using the default encoding as specified by the file.encoding system property.
byte[] getBytes(String encoding)
Converts this String to a byte encoding using the specified encoding.
void getChars(int start, int end, char[] buffer, int index)
Copies the specified characters in this String to the character array starting at the specified offset in the character array.
int hashCode()
Returns an integer hash code for the receiver.
int indexOf(int c, int start)
Searches in this String for the index of the specified character.
int indexOf(int c)
Searches in this String for the first index of the specified character.
int indexOf(String subString, int start)
Searches in this String for the index of the specified string.
int indexOf(String string)
Searches in this String for the first index of the specified string.
String intern()
Searches an internal table of strings for a string equal to this String.
int lastIndexOf(int c)
Searches in this String for the last index of the specified character.
int lastIndexOf(String string)
Searches in this String for the last index of the specified string.
int lastIndexOf(String subString, int start)
Searches in this String for the index of the specified string.
int lastIndexOf(int c, int start)
Searches in this String for the index of the specified character.
int length()
Returns the size of this String.
boolean matches(String expr)
Determines whether a this String matches a given regular expression.
int offsetByCodePoints(int index, int codePointOffset)

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

boolean regionMatches(int thisStart, String string, int start, int length)
Compares the specified string to this String and compares the specified range of characters to determine if they are the same.
boolean regionMatches(boolean ignoreCase, int thisStart, String string, int start, int length)
Compares the specified string to this String and compares the specified range of characters to determine if they are the same.
String replace(char oldChar, char newChar)
Copies this String replacing occurrences of the specified character with another character.
String replace(CharSequence target, CharSequence replacement)
Copies this String replacing occurrences of the specified target sequence with another sequence.
String replaceAll(String expr, String substitute)
Replace any substrings within this String that match the supplied regular expression expr, with the String substitute.
String replaceFirst(String expr, String substitute)
Replace the first substring within this String that matches the supplied regular expression expr, with the String substitute.
String[] split(String expr, int max)
Splits this String using the supplied regular expression expr.
String[] split(String expr)
Splits this String using the supplied regular expression expr.
boolean startsWith(String prefix, int start)
Compares the specified string to this String, starting at the specified offset, to determine if the specified string is a prefix.
boolean startsWith(String prefix)
Compares the specified string to this String to determine if the specified string is a prefix.
CharSequence subSequence(int start, int end)
Has the same result as the substring function, but is present so that String may implement the CharSequence interface.
String substring(int start, int end)
Copies a range of characters into a new String.
String substring(int start)
Copies a range of characters into a new String.
char[] toCharArray()
Copies the characters in this String to a character array.
String toLowerCase(Locale locale)
Converts the characters in this String to lowercase, using the specified Locale.
String toLowerCase()
Converts the characters in this String to lowercase, using the default Locale.
String toString()
Returns a string containing a concise, human-readable description of the receiver.
String toUpperCase(Locale locale)
Converts the characters in this String to uppercase, using the specified Locale.
String toUpperCase()
Converts the characters in this String to uppercase, using the default Locale.
String trim()
Copies this String removing white space characters from the beginning and end of the string.
static String valueOf(float value)
Converts the specified float to its string representation.
static String valueOf(boolean value)
Converts the specified boolean to its string representation.
static String valueOf(double value)
Converts the specified double to its string representation.
static String valueOf(char value)
Converts the specified character to its string representation.
static String valueOf(char[] data)
Creates a new String containing the characters in the specified character array.
static String valueOf(char[] data, int start, int length)
Creates a new String containing the specified characters in the character array.
static String valueOf(long value)
Converts the specified long to its string representation.
static String valueOf(int value)
Converts the specified integer to its string representation.
static String valueOf(Object value)
Converts the specified object to its string representation.
[Expand]
Inherited Methods
From class java.lang.Object
From interface java.lang.CharSequence
From interface java.lang.Comparable

Constants

public static final Comparator<String> CASE_INSENSITIVE_ORDER

Public Constructors

public String ()

Returns an empty string.

public String (byte[] data)

Converts the byte array to a String using the default encoding as specified by the file.encoding system property. If the system property is not defined, the default encoding is ISO8859_1 (ISO-Latin-1). If 8859-1 is not available, an ASCII encoding is used.

Parameters
data the byte array to convert to a String
Throws
NullPointerException when data is null
See Also

public String (byte[] data, int high)

This constructor is deprecated.Use String(byte[]) or String(byte[], String) instead

Converts the byte array to a String, setting the high byte of every character to the specified value.

Parameters
data the byte array to convert to a String
high the high byte to use
Throws
NullPointerException when data is null

public String (byte[] data, int start, int length)

Converts the byte array to a String using the default encoding as specified by the file.encoding system property. If the system property is not defined, the default encoding is ISO8859_1 (ISO-Latin-1). If 8859-1 is not available, an ASCII encoding is used.

Parameters
data the byte array to convert to a String
start the starting offset in the byte array
length the number of bytes to convert
Throws
IndexOutOfBoundsException when length < 0, start < 0 or start + length > data.length
NullPointerException when data is null
See Also

public String (byte[] data, int high, int start, int length)

This constructor is deprecated.Use String(byte[], int, int) instead

Converts the byte array to a String, setting the high byte of every character to the specified value.

Parameters
data the byte array to convert to a String
high the high byte to use
start the starting offset in the byte array
length the number of bytes to convert
Throws
IndexOutOfBoundsException when length < 0, start < 0 or start + length > data.length
NullPointerException when data is null

public String (byte[] data, int start, int length, String encoding)

Converts the byte array to a String using the specified encoding.

Parameters
data the byte array to convert to a String
start the starting offset in the byte array
length the number of bytes to convert
encoding the encoding
Throws
IndexOutOfBoundsException when length < 0, start < 0 or start + length > data.length
UnsupportedEncodingException when encoding is not supported
NullPointerException when data is null
See Also

public String (byte[] data, String encoding)

Converts the byte array to a String using the specified encoding.

Parameters
data the byte array to convert to a String
encoding the encoding
Throws
UnsupportedEncodingException when encoding is not supported
NullPointerException when data is null
See Also

public String (char[] data)

Initializes this String to contain the characters in the specified character array. Modifying the character array after creating the String has no effect on the String.

Parameters
data the array of characters
Throws
NullPointerException when data is null

public String (char[] data, int start, int length)

Initializes this String to contain the specified characters in the character array. Modifying the character array after creating the String has no effect on the String.

Parameters
data the array of characters
start the starting offset in the character array
length the number of characters to use
Throws
IndexOutOfBoundsException when length < 0, start < 0 or start + length > data.length
NullPointerException when data is null

public String (String string)

Creates a string that is a copy of another string

Parameters
string the String to copy

public String (StringBuffer stringbuffer)

Creates a string from the contents of a StringBuffer.

Parameters
stringbuffer the StringBuffer

public String (int[] codePoints, int offset, int count)

Constructs a String from the sub-array of Unicode code points.

Parameters
codePoints The array of Unicode code points to convert.
offset The inclusive index into codePoints to begin converting from.
count The number of element in codePoints to copy.
Throws
NullPointerException if codePoints is null.
IllegalArgumentException if any of the elements of codePoints are not valid Unicode code points.
IndexOutOfBoundsException if offset or count are not within the bounds of codePoints.

public String (StringBuilder sb)

Constructs a String from a StringBuilder.

Parameters
sb The StringBuilder to copy from.
Throws
NullPointerException if sb is null.

Public Methods

public char charAt (int index)

Returns the character at the specified offset in this String.

Parameters
index the zero-based index in this string
Returns
  • the character at the index
Throws
IndexOutOfBoundsException when index < 0 or index >= length()

public int codePointAt (int index)

Retrieves the Unicode code point value at the index.

Parameters
index The index to the char code unit within this object.
Returns
  • The Unicode code point value.
Throws
IndexOutOfBoundsException if index is negative or greater than or equal to length().
See Also

public int codePointBefore (int index)

Retrieves the Unicode code point value that precedes the index.

Parameters
index The index to the char code unit within this object.
Returns
  • The Unicode code point value.
Throws
IndexOutOfBoundsException if index is less than 1 or greater than length().
See Also

public int codePointCount (int beginIndex, int endIndex)

Calculates the number of Unicode code points between beginIndex and endIndex.

Parameters
beginIndex The inclusive beginning index of the subsequence.
endIndex The exclusive end index of the subsequence.
Returns
  • The number of Unicode code points in the subsequence.
Throws
IndexOutOfBoundsException if beginIndex is negative or greater than endIndex or endIndex is greater than length().

public int compareTo (String string)

Compares the specified String to this String using the Unicode values of the characters. Returns 0 if the strings contain the same characters in the same order. Returns a negative integer if the first non-equal character in this String has a Unicode value which is less than the Unicode value of the character at the same position in the specified string, or if this String is a prefix of the specified string. Returns a positive integer if the first non-equal character in this String has a Unicode value which is greater than the Unicode value of the character at the same position in the specified string, or if the specified String is a prefix of the this String.

Parameters
string the string to compare
Returns
  • 0 if the strings are equal, a negative integer if this String is before the specified String, or a positive integer if this String is after the specified String
Throws
NullPointerException when string is null

public int compareToIgnoreCase (String string)

Compare the receiver to the specified String to determine the relative ordering when the case of the characters is ignored.

Parameters
string a String
Returns
  • an int < 0 if this String is less than the specified String, 0 if they are equal, and > 0 if this String is greater

public String concat (String string)

Concatenates this String and the specified string.

Parameters
string the string to concatenate
Returns
  • a new String which is the concatenation of this String and the specified String
Throws
NullPointerException if string is null

public boolean contains (CharSequence cs)

Determines if this String contains the sequence of characters in the CharSequence passed.

Parameters
cs The character sequence to search for.
Returns
  • true if the sequence of characters are contained in this object; otherwise false

public boolean contentEquals (StringBuffer strbuf)

Returns whether the characters in the StringBuffer strbuf are the same as those in this String.

Parameters
strbuf the StringBuffer to compare this String to
Returns
  • true when the characters in strbuf are identical to those in this String. If they are not, false will be returned.
Throws
NullPointerException when strbuf is null

public boolean contentEquals (CharSequence cs)

Compares a CharSequence to this String to determine if their contents are equal.

Parameters
cs The character sequence to compare to.
Returns
  • true if equal, otherwise false

public static String copyValueOf (char[] data)

Creates a new String containing the characters in the specified character array. Modifying the character array after creating the String has no effect on the String.

Parameters
data the array of characters
Returns
  • the new String
Throws
NullPointerException if data is null

public static String copyValueOf (char[] data, int start, int length)

Creates a new String containing the specified characters in the character array. Modifying the character array after creating the String has no effect on the String.

Parameters
data the array of characters
start the starting offset in the character array
length the number of characters to use
Returns
  • the new String
Throws
IndexOutOfBoundsException if length < 0, start < 0 or start + length > data.length
NullPointerException if data is null

public boolean endsWith (String suffix)

Compares the specified string to this String to determine if the specified string is a suffix.

Parameters
suffix the string to look for
Returns
  • true when the specified string is a suffix of this String, false otherwise
Throws
NullPointerException if suffix is null

public boolean equals (Object object)

Compares the specified object to this String and returns true if they are equal. The object must be an instance of String with the same characters in the same order.

Parameters
object the object to compare
Returns
  • true if the specified object is equal to this String, false otherwise
See Also

public boolean equalsIgnoreCase (String string)

Compares the specified String to this String ignoring the case of the characters and returns true if they are equal.

Parameters
string the string to compare
Returns
  • true if the specified string is equal to this String, false otherwise

public static String format (String format, Object... args)

Returns a printf-style formatted string, using the supplied format and arguments. This function is a shortcut to format(Locale.getDefault(), format, args).

Parameters
format a format string
args arguments to replace format specifiers, may be none
Returns
  • The formatted string
Throws
NullPointerException if the format is null
IllegalArgumentException if the format is invalid
See Also

public static String format (Locale loc, String format, Object... args)

Returns a printf-style formatted string, using the supplied format and arguments, accordingly to the specified locale.

Note that this is a convenience method. Using it involves creating an internal Formatter instance on-the-fly, which is somewhat costly in terms of memory and time. This is probably acceptable if you use the method only rarely, but if you rely on it for formatting a large number of strings, consider creating and reusing your own Formatter instance instead.

Parameters
loc the locale to apply; null value means no localization
format a format string
args arguments to replace format specifiers, may be none
Returns
  • The formatted string
Throws
NullPointerException if the format is null
IllegalArgumentException if the format is invalid
See Also

public void getBytes (int start, int end, byte[] data, int index)

This method is deprecated.Use getBytes() or getBytes(String)

Converts this String to a byte array, ignoring the high order bits of each character.

Parameters
start the starting offset of characters to copy
end the ending offset of characters to copy
data the destination byte array
index the starting offset in the byte array
Throws
NullPointerException when data is null
IndexOutOfBoundsException when start < 0, end > length(), index < 0, end - start > data.length - index

public byte[] getBytes ()

Converts this String to a byte encoding using the default encoding as specified by the file.encoding system property. If the system property is not defined, the default encoding is ISO8859_1 (ISO-Latin-1). If 8859-1 is not available, an ASCII encoding is used.

Returns
  • the byte array encoding of this String
See Also

public byte[] getBytes (String encoding)

Converts this String to a byte encoding using the specified encoding.

Parameters
encoding the encoding
Returns
  • the byte array encoding of this String
Throws
UnsupportedEncodingException when the encoding is not supported
See Also

public void getChars (int start, int end, char[] buffer, int index)

Copies the specified characters in this String to the character array starting at the specified offset in the character array.

Parameters
start the starting offset of characters to copy
end the ending offset of characters to copy
buffer the destination character array
index the starting offset in the character array
Throws
IndexOutOfBoundsException when start < 0, end > length(), start > end, index < 0, end - start > buffer.length - index
NullPointerException when buffer is null

public int hashCode ()

Returns an integer hash code for the receiver. Objects which are equal return the same value for this method.

Returns
  • the receiver's hash
See Also

public int indexOf (int c, int start)

Searches in this String for the index of the specified character. The search for the character starts at the specified offset and moves towards the end of this String.

Parameters
c the character to find
start the starting offset
Returns
  • the index in this String of the specified character, -1 if the character isn't found
See Also

public int indexOf (int c)

Searches in this String for the first index of the specified character. The search for the character starts at the beginning and moves towards the end of this String.

Parameters
c the character to find
Returns
  • the index in this String of the specified character, -1 if the character isn't found
See Also

public int indexOf (String subString, int start)

Searches in this String for the index of the specified string. The search for the string starts at the specified offset and moves towards the end of this String.

Parameters
subString the string to find
start the starting offset
Returns
  • the index in this String of the specified string, -1 if the string isn't found
Throws
NullPointerException when string is null
See Also

public int indexOf (String string)

Searches in this String for the first index of the specified string. The search for the string starts at the beginning and moves towards the end of this String.

Parameters
string the string to find
Returns
  • the index in this String of the specified string, -1 if the string isn't found
Throws
NullPointerException when string is null
See Also

public String intern ()

Searches an internal table of strings for a string equal to this String. If the string is not in the table, it is added. Returns the string contained in the table which is equal to this String. The same string object is always returned for strings which are equal.

Returns
  • the interned string equal to this String

public int lastIndexOf (int c)

Searches in this String for the last index of the specified character. The search for the character starts at the end and moves towards the beginning of this String.

Parameters
c the character to find
Returns
  • the index in this String of the specified character, -1 if the character isn't found
See Also

public int lastIndexOf (String string)

Searches in this String for the last index of the specified string. The search for the string starts at the end and moves towards the beginning of this String.

Parameters
string the string to find
Returns
  • the index in this String of the specified string, -1 if the string isn't found
Throws
NullPointerException when string is null
See Also

public int lastIndexOf (String subString, int start)

Searches in this String for the index of the specified string. The search for the string starts at the specified offset and moves towards the beginning of this String.

Parameters
subString the string to find
start the starting offset
Returns
  • the index in this String of the specified string, -1 if the string isn't found
Throws
NullPointerException when string is null
See Also

public int lastIndexOf (int c, int start)

Searches in this String for the index of the specified character. The search for the character starts at the specified offset and moves towards the beginning of this String.

Parameters
c the character to find
start the starting offset
Returns
  • the index in this String of the specified character, -1 if the character isn't found
See Also

public int length ()

Returns the size of this String.

Returns
  • the number of characters in this String

public boolean matches (String expr)

Determines whether a this String matches a given regular expression.

Parameters
expr the regular expression to be matched
Returns
  • true if the expression matches, otherwise false
Throws
PatternSyntaxException if the syntax of the supplied regular expression is not valid
NullPointerException if expr is null

public int offsetByCodePoints (int index, int codePointOffset)

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

Parameters
index The index within this object to calculate the offset from.
codePointOffset The number of code points to count.
Returns
  • The index within this object that is the offset.
Throws
IndexOutOfBoundsException if index is negative or greater than length() or if there aren't enough code points before or after index to match codePointOffset.

public boolean regionMatches (int thisStart, String string, int start, int length)

Compares the specified string to this String and compares the specified range of characters to determine if they are the same.

Parameters
thisStart the starting offset in this String
string the string to compare
start the starting offset in string
length the number of characters to compare
Returns
  • true if the ranges of characters is equal, false otherwise
Throws
NullPointerException when string is null

public boolean regionMatches (boolean ignoreCase, int thisStart, String string, int start, int length)

Compares the specified string to this String and compares the specified range of characters to determine if they are the same. When ignoreCase is true, the case of the characters is ignored during the comparison.

Parameters
ignoreCase specifies if case should be ignored
thisStart the starting offset in this String
string the string to compare
start the starting offset in string
length the number of characters to compare
Returns
  • true if the ranges of characters is equal, false otherwise
Throws
NullPointerException when string is null

public String replace (char oldChar, char newChar)

Copies this String replacing occurrences of the specified character with another character.

Parameters
oldChar the character to replace
newChar the replacement character
Returns
  • a new String with occurrences of oldChar replaced by newChar

public String replace (CharSequence target, CharSequence replacement)

Copies this String replacing occurrences of the specified target sequence with another sequence. The string is processed from the beginning to the end.

Parameters
target the sequence to replace
replacement the replacement sequence
Returns
  • the resulting String
Throws
NullPointerException if either of the arguments is null

public String replaceAll (String expr, String substitute)

Replace any substrings within this String that match the supplied regular expression expr, with the String substitute.

Parameters
expr the regular expression to match
substitute the string to replace the matching substring with
Returns
  • the new string
Throws
NullPointerException if expr is null

public String replaceFirst (String expr, String substitute)

Replace the first substring within this String that matches the supplied regular expression expr, with the String substitute.

Parameters
expr the regular expression to match
substitute the string to replace the matching substring with
Returns
  • the new string
Throws
NullPointerException if expr is null

public String[] split (String expr, int max)

Splits this String using the supplied regular expression expr. max controls the number of times that the pattern is applied to the string.

Parameters
expr the regular expression used to divide the string
max the number of times to apply the pattern
Returns
  • an array of Strings created by separating the string along matches of the regular expression.
Throws
NullPointerException if expr is null

public String[] split (String expr)

Splits this String using the supplied regular expression expr.

Parameters
expr the regular expression used to divide the string
Returns
  • an array of Strings created by separating the string along matches of the regular expression.
Throws
NullPointerException if expr is null

public boolean startsWith (String prefix, int start)

Compares the specified string to this String, starting at the specified offset, to determine if the specified string is a prefix.

Parameters
prefix the string to look for
start the starting offset
Returns
  • true when the specified string occurs in this String at the specified offset, false otherwise
Throws
NullPointerException when prefix is null

public boolean startsWith (String prefix)

Compares the specified string to this String to determine if the specified string is a prefix.

Parameters
prefix the string to look for
Returns
  • true when the specified string is a prefix of this String, false otherwise
Throws
NullPointerException when prefix is null

public CharSequence subSequence (int start, int end)

Has the same result as the substring function, but is present so that String may implement the CharSequence interface.

Parameters
start the offset the first character
end the offset of one past the last character to include
Returns
  • the subsequence requested
Throws
IndexOutOfBoundsException when start or end is less than zero, start is greater than end, or end is greater than the length of the String.
See Also

public String substring (int start, int end)

Copies a range of characters into a new String.

Parameters
start the offset of the first character
end the offset one past the last character
Returns
  • a new String containing the characters from start to end - 1
Throws
IndexOutOfBoundsException when start < 0, start > end or end > length()

public String substring (int start)

Copies a range of characters into a new String.

Parameters
start the offset of the first character
Returns
  • a new String containing the characters from start to the end of the string
Throws
IndexOutOfBoundsException when start < 0 or start > length()

public char[] toCharArray ()

Copies the characters in this String to a character array.

Returns
  • a character array containing the characters of this String

public String toLowerCase (Locale locale)

Converts the characters in this String to lowercase, using the specified Locale.

Parameters
locale the Locale
Returns
  • a new String containing the lowercase characters equivalent to the characters in this String

public String toLowerCase ()

Converts the characters in this String to lowercase, using the default Locale.

Returns
  • a new String containing the lowercase characters equivalent to the characters in this String

public String toString ()

Returns a string containing a concise, human-readable description of the receiver.

Returns
  • this String

public String toUpperCase (Locale locale)

Converts the characters in this String to uppercase, using the specified Locale.

Parameters
locale the Locale
Returns
  • a new String containing the uppercase characters equivalent to the characters in this String

public String toUpperCase ()

Converts the characters in this String to uppercase, using the default Locale.

Returns
  • a new String containing the uppercase characters equivalent to the characters in this String

public String trim ()

Copies this String removing white space characters from the beginning and end of the string.

Returns
  • a new String with characters <= \\u0020 removed from the beginning and the end

public static String valueOf (float value)

Converts the specified float to its string representation.

Parameters
value the float
Returns
  • the float converted to a string

public static String valueOf (boolean value)

Converts the specified boolean to its string representation. When the boolean is true return "true", otherwise return "false".

Parameters
value the boolean
Returns
  • the boolean converted to a string

public static String valueOf (double value)

Converts the specified double to its string representation.

Parameters
value the double
Returns
  • the double converted to a string

public static String valueOf (char value)

Converts the specified character to its string representation.

Parameters
value the character
Returns
  • the character converted to a string

public static String valueOf (char[] data)

Creates a new String containing the characters in the specified character array. Modifying the character array after creating the String has no effect on the String.

Parameters
data the array of characters
Returns
  • the new String
Throws
NullPointerException when data is null

public static String valueOf (char[] data, int start, int length)

Creates a new String containing the specified characters in the character array. Modifying the character array after creating the String has no effect on the String.

Parameters
data the array of characters
start the starting offset in the character array
length the number of characters to use
Returns
  • the new String
Throws
IndexOutOfBoundsException when length < 0, start < 0 or start + length > data.length
NullPointerException when data is null

public static String valueOf (long value)

Converts the specified long to its string representation.

Parameters
value the long
Returns
  • the long converted to a string

public static String valueOf (int value)

Converts the specified integer to its string representation.

Parameters
value the integer
Returns
  • the integer converted to a string

public static String valueOf (Object value)

Converts the specified object to its string representation. If the object is null return the string "null", otherwise use toString() to get the string representation.

Parameters
value the object
Returns
  • the object converted to a string