IT. Expert System.

Android Reference

String

java.lang

Class String

java.lang.Object
- java.lang.String

All Implemented Interfaces:

Serializable, CharSequence, Comparable<String>
```
public final class String
extends Object
implements Serializable, Comparable<String>, CharSequence
```
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).
Backing Arrays
This class is implemented using a char[]. The length of the array may exceed the length of the string. For example, the string "Hello" may be backed by the array ['H', 'e', 'l', 'l', 'o', 'W'. 'o', 'r', 'l', 'd'] with offset 0 and length 5.
Multiple strings can share the same char[] because strings are immutable. The substring(int) method always returns a string that shares the backing array of its source string. Generally this is an optimization: fewer character arrays need to be allocated, and less copying is necessary. But this can also lead to unwanted heap retention. Taking a short substring of long string means that the long shared char[] won't be garbage until both strings are garbage. This typically happens when parsing small substrings out of a large input. To avoid this where necessary, call new String(longString.subString(...)). The string copy constructor always ensures that the backing array is no larger than necessary.

Since:

1.0

See Also:
StringBuffer, StringBuilder, Charset, Serialized Form

Field Summary

Fields
Modifier and Type Field and Description

static Comparator<String> CASE_INSENSITIVE_ORDER
A comparator ignoring the case of the characters.

Fields
Modifier and Type	Field and Description
`static Comparator<String>`	`CASE_INSENSITIVE_ORDER` A comparator ignoring the case of the characters.

Constructor Summary

Constructors
Constructor and Description
`String()` Creates an empty string.
`String(byte[] data)` Converts the byte array to a string using the system's `default charset`.
`String(byte[] data, Charset charset)` Converts the byte array to a String using the given charset.
`String(byte[] data, int high)` Deprecated. Use `String(byte[])` or `String(byte[], String)` instead.
`String(byte[] data, int offset, int byteCount)` Converts a subsequence of the byte array to a string using the system's `default charset`.
`String(byte[] data, int offset, int byteCount, Charset charset)` Converts the byte array to a string using the given charset.
`String(byte[] data, int high, int offset, int byteCount)` Deprecated. Use `String(byte[], int, int)` instead.
`String(byte[] data, int offset, int byteCount, String charsetName)` Converts the byte array to a string using the named charset.
`String(byte[] data, String charsetName)` Converts the byte array to a string using the named charset.
`String(char[] data)` Initializes this string to contain the characters in the specified character array.
`String(char[] data, int offset, int charCount)` Initializes this string to contain the specified characters in the character array.
`String(int[] codePoints, int offset, int count)` Creates a `String` from the sub-array of Unicode code points.
`String(String toCopy)` Constructs a new string with the same sequence of characters as `toCopy`.
`String(StringBuffer stringBuffer)` Creates a `String` from the contents of the specified `StringBuffer`.
`String(StringBuilder stringBuilder)` Creates a `String` from the contents of the specified `StringBuilder`.

Method Summary

Methods
Modifier and Type	Method and Description
`char`	`charAt(int index)` Returns the character at the specified offset in this string.
`int`	`codePointAt(int index)` Returns the Unicode code point at the given `index`.
`int`	`codePointBefore(int index)` Returns the Unicode code point that precedes the given `index`.
`int`	`codePointCount(int start, int end)` Calculates the number of Unicode code points between `start` and `end`.
`int`	`compareTo(String string)` Compares the specified string to this string using the Unicode values of the characters.
`int`	`compareToIgnoreCase(String string)` Compares the specified string to this string using the Unicode values of the characters, ignoring case differences.
`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(CharSequence cs)` Compares a `CharSequence` to this `String` to determine if their contents are equal.
`boolean`	`contentEquals(StringBuffer strbuf)` Returns whether the characters in the StringBuffer `strbuf` are the same as those in this string.
`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(Locale locale, String format, Object... args)` Returns a formatted string, using the supplied format and arguments, localized to the given locale.
`static String`	`format(String format, Object... args)` Returns a localized formatted string, using the supplied format and arguments, using the user's default locale.
`byte[]`	`getBytes()` Returns a new byte array containing the characters of this string encoded using the system's `default charset`.
`byte[]`	`getBytes(Charset charset)` Returns a new byte array containing the characters of this string encoded using the given charset.
`void`	`getBytes(int start, int end, byte[] data, int index)` Deprecated. Use `getBytes()` or `getBytes(String)`
`byte[]`	`getBytes(String charsetName)` Returns a new byte array containing the characters of this string encoded using the named charset.
`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 this object.
`int`	`indexOf(int c)` Searches in this string for the first index of the specified character.
`int`	`indexOf(int c, int start)` Searches in this string for the index of the specified character.
`int`	`indexOf(String string)` Searches in this string for the first index of the specified string.
`int`	`indexOf(String subString, int start)` Searches in this string for the index of the specified string.
`String`	`intern()` Returns an interned string equal to this string.
`boolean`	`isEmpty()` Returns true if the length of this string is 0.
`int`	`lastIndexOf(int c)` Returns the last index of the code point `c`, or -1.
`int`	`lastIndexOf(int c, int start)` Returns the last index of the code point `c`, or -1.
`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`	`length()` Returns the size of this string.
`boolean`	`matches(String regularExpression)` Tests whether this string matches the given `regularExpression`.
`int`	`offsetByCodePoints(int index, int codePointOffset)` Returns the index within this object that is offset from `index` by `codePointOffset` code points.
`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.
`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.
`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 regularExpression, String replacement)` Replaces all matches for `regularExpression` within this string with the given `replacement`.
`String`	`replaceFirst(String regularExpression, String replacement)` Replaces the first match for `regularExpression` within this string with the given `replacement`.
`String[]`	`split(String regularExpression)` Splits this string using the supplied `regularExpression`.
`String[]`	`split(String regularExpression, int limit)` Splits this string using the supplied `regularExpression`.
`boolean`	`startsWith(String prefix)` Compares the specified string to this string to determine if the specified string is a prefix.
`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.
`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)` Returns a string containing a suffix of this string.
`String`	`substring(int start, int end)` Returns a string containing a subsequence of characters from this string.
`char[]`	`toCharArray()` Copies the characters in this string to a character array.
`String`	`toLowerCase()` Converts this string to lower case, using the rules of the user's default locale.
`String`	`toLowerCase(Locale locale)` Converts this string to lower case, using the rules of `locale`.
`String`	`toString()` Returns this string.
`String`	`toUpperCase()` Converts this this string to upper case, using the rules of the user's default locale.
`String`	`toUpperCase(Locale locale)` Converts this this string to upper case, using the rules of `locale`.
`String`	`trim()` Copies this string removing white space characters from the beginning and end of the string.
`static String`	`valueOf(boolean value)` Converts the specified boolean 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(double value)` Converts the specified double to its string representation.
`static String`	`valueOf(float value)` Converts the specified float to its string representation.
`static String`	`valueOf(int value)` Converts the specified integer to its string representation.
`static String`	`valueOf(long value)` Converts the specified long to its string representation.
`static String`	`valueOf(Object value)` Converts the specified object to its string representation.

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - CASE_INSENSITIVE_ORDER
```
public static final Comparator<String> CASE_INSENSITIVE_ORDER
```
    A comparator ignoring the case of the characters.
- Constructor Detail
  - String
```
public String()
```
    Creates an empty string.
  - String
```
public String(byte[] data)
```
    Converts the byte array to a string using the system's default charset.
  - String
```
@Deprecated
public String(byte[] data,
                 int high)
```
    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 - if data == null.
  - String
```
public String(byte[] data,
      int offset,
      int byteCount)
```
    Converts a subsequence of the byte array to a string using the system's default charset.
    
    Throws:
    
    NullPointerException - if data == null.
    
    IndexOutOfBoundsException - if byteCount < 0 || offset < 0 || offset + byteCount > data.length.
  - String
```
@Deprecated
public String(byte[] data,
                 int high,
                 int offset,
                 int byteCount)
```
    Deprecated. Use String(byte[], int, int) instead.
    
    Converts the byte array to a string, setting the high byte of every character to high.
    
    Throws:
    
    NullPointerException - if data == null.
    
    IndexOutOfBoundsException - if byteCount < 0 || offset < 0 || offset + byteCount > data.length
  - String
```
public String(byte[] data,
      int offset,
      int byteCount,
      String charsetName)
       throws UnsupportedEncodingException
```
    Converts the byte array to a string using the named charset.
    The behavior when the bytes cannot be decoded by the named charset is unspecified. Use CharsetDecoder for more control.
    
    Throws:
    
    NullPointerException - if data == null.
    
    IndexOutOfBoundsException - if byteCount < 0 || offset < 0 || offset + byteCount > data.length.
    
    UnsupportedEncodingException - if the named charset is not supported.
  - String
```
public String(byte[] data,
      String charsetName)
       throws UnsupportedEncodingException
```
    Converts the byte array to a string using the named charset.
    The behavior when the bytes cannot be decoded by the named charset is unspecified. Use CharsetDecoder for more control.
    
    Throws:
    
    NullPointerException - if data == null.
    
    UnsupportedEncodingException - if charsetName is not supported.
  - String
```
public String(byte[] data,
      int offset,
      int byteCount,
      Charset charset)
```
    Converts the byte array to a string using the given charset.
    The behavior when the bytes cannot be decoded by the given charset is to replace malformed input and unmappable characters with the charset's default replacement string. Use CharsetDecoder for more control.
    
    Throws:
    
    IndexOutOfBoundsException - if byteCount < 0 || offset < 0 || offset + byteCount > data.length
    
    NullPointerException - if data == null
    Since:
    
    1.6
  - String
```
public String(byte[] data,
      Charset charset)
```
    Converts the byte array to a String using the given charset.
    
    Throws:
    
    NullPointerException - if data == null
    Since:
    
    1.6
  - String
```
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.
    
    Throws:
    
    NullPointerException - if data == null
  - String
```
public String(char[] data,
      int offset,
      int charCount)
```
    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.
    
    Throws:
    
    NullPointerException - if data == null.
    
    IndexOutOfBoundsException - if charCount < 0 || offset < 0 || offset + charCount > data.length
  - String
```
public String(String toCopy)
```
    Constructs a new string with the same sequence of characters as toCopy. The returned string's backing array is no larger than necessary.
  - String
```
public String(StringBuffer stringBuffer)
```
    Creates a String from the contents of the specified StringBuffer.
  - String
```
public String(int[] codePoints,
      int offset,
      int count)
```
    Creates a String from the sub-array of Unicode code points.
    
    Throws:
    
    NullPointerException - if codePoints == 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.
    Since:
    
    1.5
  - String
```
public String(StringBuilder stringBuilder)
```
    Creates a String from the contents of the specified StringBuilder.
    
    Throws:
    
    NullPointerException - if stringBuilder == null.
    Since:
    
    1.5
- Method Detail
  - charAt
```
public char charAt(int index)
```
    Returns the character at the specified offset in this string.
    
    Specified by:
    
    charAt in interface CharSequence
    
    Parameters:
    index - the zero-based index in this string.
    
    Returns:
    the character at the index.
    
    Throws:
    
    IndexOutOfBoundsException - if index < 0 or index >= length().
  - compareTo
```
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 this string.
    
    Specified by:
    
    compareTo in interface Comparable<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 - if string is null.
  - compareToIgnoreCase
```
public int compareToIgnoreCase(String string)
```
    Compares the specified string to this string using the Unicode values of the characters, ignoring case differences. 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 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 - if string is null.
  - concat
```
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.
  - copyValueOf
```
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.
  - copyValueOf
```
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:
    
    NullPointerException - if data is null.
    
    IndexOutOfBoundsException - if length < 0, start < 0 or start + length > data.length.
  - endsWith
```
public boolean endsWith(String suffix)
```
    Compares the specified string to this string to determine if the specified string is a suffix.
    
    Parameters:
    suffix - the suffix to look for.
    
    Returns:
    true if the specified string is a suffix of this string, false otherwise.
    
    Throws:
    
    NullPointerException - if suffix is null.
  - equals
```
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.
    
    Overrides:
    
    equals in class Object
    
    Parameters:
    object - the object to compare.
    
    Returns:
    true if the specified object is equal to this string, false otherwise.
    See Also:
    hashCode
  - equalsIgnoreCase
```
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.
  - getBytes
```
@Deprecated
public void getBytes(int start,
                       int end,
                       byte[] data,
                       int index)
```
    Deprecated. Use getBytes() or getBytes(String)
    
    Mangles this string into a byte array by stripping the high order bits from each character. Use getBytes() or getBytes(String) instead.
    
    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 destination byte array.
    
    Throws:
    
    NullPointerException - if data is null.
    
    IndexOutOfBoundsException - if start < 0, end > length(), index < 0 or end - start > data.length - index.
  - getBytes
```
public byte[] getBytes()
```
    Returns a new byte array containing the characters of this string encoded using the system's default charset.
    The behavior when this string cannot be represented in the system's default charset is unspecified. In practice, when the default charset is UTF-8 (as it is on Android), all strings can be encoded.
  - getBytes
```
public byte[] getBytes(String charsetName)
                throws UnsupportedEncodingException
```
    Returns a new byte array containing the characters of this string encoded using the named charset.
    The behavior when this string cannot be represented in the named charset is unspecified. Use CharsetEncoder for more control.
    
    Throws:
    
    UnsupportedEncodingException - if the charset is not supported
  - getBytes
```
public byte[] getBytes(Charset charset)
```
    Returns a new byte array containing the characters of this string encoded using the given charset.
    The behavior when this string cannot be represented in the given charset is to replace malformed input and unmappable characters with the charset's default replacement byte array. Use CharsetEncoder for more control.
    
    Since:
    
    1.6
  - getChars
```
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:
    
    NullPointerException - if buffer is null.
    
    IndexOutOfBoundsException - if start < 0, end > length(), start > end, index < 0, end - start > buffer.length - index
  - hashCode
```
public int hashCode()
```
    Description copied from class: Object
    
    Returns an integer hash code for this object. By contract, any two objects for which Object.equals(java.lang.Object) returns true must return the same hash code value. This means that subclasses of Object usually override both methods or neither method.
    Note that hash values must not change over time unless information used in equals comparisons also changes.
    See Writing a correct hashCode method if you intend implementing your own hashCode method.
    
    Overrides:
    
    hashCode in class Object
    
    Returns:
    this object's hash code.
    See Also:
    Object.equals(java.lang.Object)
  - indexOf
```
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.
  - indexOf
```
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.
  - indexOf
```
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 of the first character of the specified string in this string, -1 if the specified string is not a substring.
    
    Throws:
    
    NullPointerException - if string is null.
  - indexOf
```
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 of the first character of the specified string in this string, -1 if the specified string is not a substring.
    
    Throws:
    
    NullPointerException - if subString is null.
  - intern
```
public String intern()
```
    Returns an interned string equal to this string. The VM maintains an internal set of unique strings. All string literals found in loaded classes' constant pools are automatically interned. Manually-interned strings are only weakly referenced, so calling intern won't lead to unwanted retention.
    Interning is typically used because it guarantees that for interned strings a and b, a.equals(b) can be simplified to a == b. (This is not true of non-interned strings.)
    Many applications find it simpler and more convenient to use an explicit HashMap to implement their own pools.
  - isEmpty
```
public boolean isEmpty()
```
    Returns true if the length of this string is 0.
    
    Since:
    
    1.6
  - lastIndexOf
```
public int lastIndexOf(int c)
```
    Returns the last index of the code point c, or -1. The search for the character starts at the end and moves towards the beginning of this string.
  - lastIndexOf
```
public int lastIndexOf(int c,
              int start)
```
    Returns the last index of the code point c, or -1. The search for the character starts at offset start and moves towards the beginning of this string.
  - lastIndexOf
```
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 of the first character of the specified string in this string, -1 if the specified string is not a substring.
    
    Throws:
    
    NullPointerException - if string is null.
  - lastIndexOf
```
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 of the first character of the specified string in this string , -1 if the specified string is not a substring.
    
    Throws:
    
    NullPointerException - if subString is null.
  - length
```
public int length()
```
    Returns the size of this string.
    
    Specified by:
    
    length in interface CharSequence
    
    Returns:
    the number of characters in this string.
  - regionMatches
```
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 the specified string.
    length - the number of characters to compare.
    
    Returns:
    true if the ranges of characters are equal, false otherwise
    
    Throws:
    
    NullPointerException - if string is null.
  - regionMatches
```
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 the specified string.
    length - the number of characters to compare.
    
    Returns:
    true if the ranges of characters are equal, false otherwise.
    
    Throws:
    
    NullPointerException - if string is null.
  - replace
```
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.
  - replace
```
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 target or replacement is null.
  - startsWith
```
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 if the specified string is a prefix of this string, false otherwise
    
    Throws:
    
    NullPointerException - if prefix is null.
  - startsWith
```
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 if the specified string occurs in this string at the specified offset, false otherwise.
    
    Throws:
    
    NullPointerException - if prefix is null.
  - substring
```
public String substring(int start)
```
    Returns a string containing a suffix of this string. The returned string shares this string's backing array.
    
    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 - if start < 0 or start > length().
  - substring
```
public String substring(int start,
               int end)
```
    Returns a string containing a subsequence of characters from this string. The returned string shares this string's backing array.
    
    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 - if start < 0, start > end or end > length().
  - toCharArray
```
public char[] toCharArray()
```
    Copies the characters in this string to a character array.
    
    Returns:
    a character array containing the characters of this string.
  - toLowerCase
```
public String toLowerCase()
```
    Converts this string to lower case, using the rules of the user's default locale. See "Be wary of the default locale".
    
    Returns:
    a new lower case string, or this if it's already all lower case.
  - toLowerCase
```
public String toLowerCase(Locale locale)
```
    Converts this string to lower case, using the rules of locale.
    Most case mappings are unaffected by the language of a Locale. Exceptions include dotted and dotless I in Azeri and Turkish locales, and dotted and dotless I and J in Lithuanian locales. On the other hand, it isn't necessary to provide a Greek locale to get correct case mapping of Greek characters: any locale will do.
    See http://www.unicode.org/Public/UNIDATA/SpecialCasing.txt for full details of context- and language-specific special cases.
    
    Returns:
    a new lower case string, or this if it's already all lower case.
  - toString
```
public String toString()
```
    Returns this string.
    
    Specified by:
    
    toString in interface CharSequence
    
    Overrides:
    
    toString in class Object
    
    Returns:
    a printable representation of this object.
  - toUpperCase
```
public String toUpperCase()
```
    Converts this this string to upper case, using the rules of the user's default locale. See "Be wary of the default locale".
    
    Returns:
    a new upper case string, or this if it's already all upper case.
  - toUpperCase
```
public String toUpperCase(Locale locale)
```
    Converts this this string to upper case, using the rules of locale.
    Most case mappings are unaffected by the language of a Locale. Exceptions include dotted and dotless I in Azeri and Turkish locales, and dotted and dotless I and J in Lithuanian locales. On the other hand, it isn't necessary to provide a Greek locale to get correct case mapping of Greek characters: any locale will do.
    See http://www.unicode.org/Public/UNIDATA/SpecialCasing.txt for full details of context- and language-specific special cases.
    
    Returns:
    a new upper case string, or this if it's already all upper case.
  - trim
```
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.
  - valueOf
```
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 - if data is null.
  - valueOf
```
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 - if length < 0, start < 0 or start + length > data.length
    
    NullPointerException - if data is null.
  - valueOf
```
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.
  - valueOf
```
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.
  - valueOf
```
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.
  - valueOf
```
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.
  - valueOf
```
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.
  - valueOf
```
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, or the string "null".
  - valueOf
```
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.
  - contentEquals
```
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 if the characters in strbuf are identical to those in this string. If they are not, false will be returned.
    
    Throws:
    
    NullPointerException - if strbuf is null.
    Since:
    
    1.4
  - contentEquals
```
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
    Since:
    
    1.5
  - matches
```
public boolean matches(String regularExpression)
```
    Tests whether this string matches the given regularExpression. This method returns true only if the regular expression matches the entire input string. A common mistake is to assume that this method behaves like contains(java.lang.CharSequence); if you want to match anywhere within the input string, you need to add .* to the beginning and end of your regular expression. See Pattern.matches(java.lang.String, java.lang.CharSequence).
    If the same regular expression is to be used for multiple operations, it may be more efficient to reuse a compiled Pattern.
    
    Throws:
    
    PatternSyntaxException - if the syntax of the supplied regular expression is not valid.
    
    NullPointerException - if regularExpression == null
    Since:
    
    1.4
  - replaceAll
```
public String replaceAll(String regularExpression,
                String replacement)
```
    Replaces all matches for regularExpression within this string with the given replacement. See Pattern for regular expression syntax.
    If the same regular expression is to be used for multiple operations, it may be more efficient to reuse a compiled Pattern.
    
    Throws:
    
    PatternSyntaxException - if the syntax of the supplied regular expression is not valid.
    
    NullPointerException - if regularExpression == null
    Since:
    
    1.4
    
    See Also:
    Pattern
  - replaceFirst
```
public String replaceFirst(String regularExpression,
                  String replacement)
```
    Replaces the first match for regularExpression within this string with the given replacement. See Pattern for regular expression syntax.
    If the same regular expression is to be used for multiple operations, it may be more efficient to reuse a compiled Pattern.
    
    Throws:
    
    PatternSyntaxException - if the syntax of the supplied regular expression is not valid.
    
    NullPointerException - if regularExpression == null
    Since:
    
    1.4
    
    See Also:
    Pattern
  - split
```
public String[] split(String regularExpression)
```
    Splits this string using the supplied regularExpression. Equivalent to split(regularExpression, 0). See Pattern.split(CharSequence, int) for an explanation of limit. See Pattern for regular expression syntax.
    If the same regular expression is to be used for multiple operations, it may be more efficient to reuse a compiled Pattern.
    
    Throws:
    
    NullPointerException - if regularExpression == null
    
    PatternSyntaxException - if the syntax of the supplied regular expression is not valid.
    Since:
    
    1.4
    
    See Also:
    Pattern
  - split
```
public String[] split(String regularExpression,
             int limit)
```
    Splits this string using the supplied regularExpression. See Pattern.split(CharSequence, int) for an explanation of limit. See Pattern for regular expression syntax.
    If the same regular expression is to be used for multiple operations, it may be more efficient to reuse a compiled Pattern.
    
    Throws:
    
    NullPointerException - if regularExpression == null
    
    PatternSyntaxException - if the syntax of the supplied regular expression is not valid.
    Since:
    
    1.4
  - subSequence
```
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.
    
    Specified by:
    
    subSequence in interface CharSequence
    
    Parameters:
    start - the offset the first character.
    end - the offset of one past the last character to include.
    
    Returns:
    the subsequence requested.
    
    Throws:
    
    IndexOutOfBoundsException - if start < 0, end < 0, start > end or end > length().
    Since:
    
    1.4
    
    See Also:
    CharSequence.subSequence(int, int)
  - codePointAt
```
public int codePointAt(int index)
```
    Returns the Unicode code point at the given index.
    
    Throws:
    
    IndexOutOfBoundsException - if index < 0 || index >= length()
    Since:
    
    1.5
    
    See Also:
    Character.codePointAt(char[], int, int)
  - codePointBefore
```
public int codePointBefore(int index)
```
    Returns the Unicode code point that precedes the given index.
    
    Throws:
    
    IndexOutOfBoundsException - if index < 1 || index > length()
    Since:
    
    1.5
    
    See Also:
    Character.codePointBefore(char[], int, int)
  - codePointCount
```
public int codePointCount(int start,
                 int end)
```
    Calculates the number of Unicode code points between start and end.
    
    Parameters:
    start - the inclusive beginning index of the subsequence.
    end - the exclusive end index of the subsequence.
    
    Returns:
    the number of Unicode code points in the subsequence.
    
    Throws:
    
    IndexOutOfBoundsException - if start < 0 || end > length() || start > end
    Since:
    
    1.5
    
    See Also:
    Character.codePointCount(CharSequence, int, int)
  - contains
```
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 string, otherwise false.
    Since:
    
    1.5
  - offsetByCodePoints
```
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.
    Since:
    
    1.5
  - format
```
public static String format(String format,
            Object... args)
```
    Returns a localized formatted string, using the supplied format and arguments, using the user's default locale.
    If you're formatting a string other than for human consumption, you should use the format(Locale, String, Object...) overload and supply Locale.US. See "Be wary of the default locale".
    
    Parameters:
    format - the format string (see Formatter.format(java.lang.String, java.lang.Object...))
    args - the list of arguments passed to the formatter. If there are more arguments than required by format, additional arguments are ignored.
    
    Returns:
    the formatted string.
    
    Throws:
    
    NullPointerException - if format == null
    
    IllegalFormatException - if the format is invalid.
    Since:
    
    1.5
  - format
```
public static String format(Locale locale,
            String format,
            Object... args)
```
    Returns a formatted string, using the supplied format and arguments, localized to the given locale.
    
    Parameters:
    locale - the locale to apply; null value means no localization.
    format - the format string (see Formatter.format(java.lang.String, java.lang.Object...))
    args - the list of arguments passed to the formatter. If there are more arguments than required by format, additional arguments are ignored.
    
    Returns:
    the formatted string.
    
    Throws:
    
    NullPointerException - if format == null
    
    IllegalFormatException - if the format is invalid.
    Since:
    
    1.5

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