All Implemented Interfaces:

Serializable, CharSequence, Comparable<String>
```
public final class String
extends Object
implements Serializable, Comparable<String>, CharSequence
```
An immutable sequence of UTF-16 chars. See Character for details about the relationship between char and Unicode code points.

Since:

1.0

See Also:

StringBuffer, StringBuilder, Charset, Serialized Form

Field Summary

Fields
Modifier and Type Field Description

static Comparator<String> CASE_INSENSITIVE_ORDER
Compares strings using compareToIgnoreCase(java.lang.String).

Constructor Summary

Constructors
Constructor	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, 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 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, int offset, int byteCount, Charset charset)`	Converts the byte array to a string using the given charset.
`String(byte[] data, String charsetName)`	Converts the byte array to a string using the named charset.
`String(byte[] data, Charset charset)`	Converts the byte array to a String using the given charset.
`String(char[] data)`	Initializes this string to contain the given `char`s.
`String(char[] data, int offset, int charCount)`	Initializes this string to contain the given `char`s.
`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

All Methods Static Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method	Description
`char`	`charAt(int index)`	Returns the `char` at `index`.
`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 this string to the given string.
`int`	`compareToIgnoreCase(String string)`	Compares this string to the given string, ignoring case differences.
`String`	`concat(String string)`	Concatenates this string and the specified string.
`boolean`	`contains(CharSequence cs)`	Returns true if this string contains the `chars`s from the given `CharSequence`.
`boolean`	`contentEquals(CharSequence cs)`	Returns true if the `char`s in the given `CharSequence` are the same as those in this string.
`boolean`	`contentEquals(StringBuffer sb)`	Returns true if the `char`s in the given `StringBuffer` are the same as those in this string.
`static String`	`copyValueOf(char[] data)`	Creates a new string by copying the given `char[]`.
`static String`	`copyValueOf(char[] data, int start, int length)`	Creates a new string by copying the given subsequence of the given `char[]`.
`boolean`	`endsWith(String suffix)`	Compares the specified string to this string to determine if the specified string is a suffix.
`boolean`	`equals(Object other)`	Compares the given object to this string and returns true if they are equal.
`boolean`	`equalsIgnoreCase(String string)`	Compares the given string to this string ignoring case.
`static String`	`format(String format, Object... args)`	Returns a localized formatted string, using the supplied format and arguments, using the user's default locale.
`static String`	`format(Locale locale, String format, Object... args)`	Returns a formatted string, using the supplied format and arguments, localized to the given locale.
`byte[]`	`getBytes()`	Returns a new byte array containing the code points in this string encoded using the system's `default 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 code points of this string encoded using the named charset.
`byte[]`	`getBytes(Charset charset)`	Returns a new byte array containing the code points of this string encoded using the given charset.
`void`	`getChars(int start, int end, char[] buffer, int index)`	Copies the given subsequence of this string to the given array starting at the given offset.
`int`	`hashCode()`	Returns an integer hash code for this object.
`int`	`indexOf(int c)`	Returns the first index of the given code point, or -1.
`int`	`indexOf(int c, int start)`	Returns the next index of the given code point, or -1.
`int`	`indexOf(String string)`	Returns the first index of the given string, or -1.
`int`	`indexOf(String subString, int start)`	Returns the next index of the given string in this string, or -1.
`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)`	Returns the index of the start of the last match for the given string in this string, or -1.
`int`	`lastIndexOf(String subString, int start)`	Returns the index of the start of the previous match for the given string in this string, or -1.
`int`	`length()`	Returns the number of `char`s in 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)`	Returns true if the given subsequence of the given string matches this string starting at the given offset.
`boolean`	`regionMatches(int thisStart, String string, int start, int length)`	Returns true if the given subsequence of the given string matches this string starting at the given offset.
`String`	`replace(char oldChar, char newChar)`	Returns a copy of this string after replacing occurrences of the given `char` with another.
`String`	`replace(CharSequence target, CharSequence replacement)`	Returns a copy of this string after replacing occurrences of `target` replaced with `replacement`.
`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)`	Equivalent to `substring(int, int)` but needed to implement `CharSequence`.
`String`	`substring(int start)`	Returns a string containing a suffix of this string starting at `start`.
`String`	`substring(int start, int end)`	Returns a string containing the given subsequence of this string.
`char[]`	`toCharArray()`	Returns a new `char` array containing a copy of the `char`s in this string.
`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()`	Returns a string with no code points `<= \\u0020` at the beginning or end.
`static String`	`valueOf(boolean value)`	Converts the specified boolean to its string representation.
`static String`	`valueOf(char value)`	Returns a new string of just the given `char`.
`static String`	`valueOf(char[] data)`	Returns a new string containing the same `char`s as the given array.
`static String`	`valueOf(char[] data, int start, int length)`	Returns a new string containing the same `char`s as the given subset of the given array.
`static String`	`valueOf(double value)`	Returns the string representation of the given double.
`static String`	`valueOf(float value)`	Returns the string representation of the given float.
`static String`	`valueOf(int value)`	Returns the string representation of the given int.
`static String`	`valueOf(long value)`	Returns the string representation of the given long.
`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
```
    Compares strings using compareToIgnoreCase(java.lang.String). This is not suitable for case-insensitive string comparison for all locales. Use a Collator instead.
- 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 char 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 char 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 code points 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 given chars. Modifying the 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 given chars. Modifying the 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.
  - 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 char at index.
    
    Specified by:
    
    charAt in interface CharSequence
    
    Throws:
    
    IndexOutOfBoundsException - if index < 0 or index >= length().
  - compareTo
```
public int compareTo(String string)
```
    Compares this string to the given string.
    The strings are compared one char at a time. In the discussion of the return value below, note that char does not mean code point, though this should only be visible for surrogate pairs.
    If there is an index at which the two strings differ, the result is the difference between the two chars at the lowest such index. If not, but the lengths of the strings differ, the result is the difference between the two strings' lengths. If the strings are the same length and every char is the same, the result is 0.
    
    Specified by:
    
    compareTo in interface Comparable<String>
    
    Parameters:
    
    string - the object to compare to this instance.
    
    Returns:
    
    a negative integer if this instance is less than another; a positive integer if this instance is greater than another; 0 if this instance has the same order as another.
    
    Throws:
    
    NullPointerException - if string is null.
  - compareToIgnoreCase
```
public int compareToIgnoreCase(String string)
```
    Compares this string to the given string, ignoring case differences.
    The strings are compared one char at a time. This is not suitable for case-insensitive string comparison for all locales. Use a Collator instead.
    If there is an index at which the two strings differ, the result is the difference between the two chars at the lowest such index. If not, but the lengths of the strings differ, the result is the difference between the two strings' lengths. If the strings are the same length and every char is the same, the result is 0.
    
    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 by copying the given char[]. Modifying the array after creating the string has no effect on the string.
    
    Throws:
    
    NullPointerException - if data is null.
  - copyValueOf
```
public static String copyValueOf(char[] data,
                                 int start,
                                 int length)
```
    Creates a new string by copying the given subsequence of the given char[]. Modifying the array after creating the string has no effect on the 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.
    
    Throws:
    
    NullPointerException - if suffix is null.
  - equals
```
public boolean equals(Object other)
```
    Compares the given object to this string and returns true if they are equal. The object must be an instance of String with the same length, where for every index, charAt on each string returns the same value.
    
    Overrides:
    
    equals in class Object
    
    Parameters:
    
    other - the object to compare this instance with.
    
    Returns:
    
    true if the specified object is equal to this Object; false otherwise.
    
    See Also:
    
    Object.hashCode()
  - equalsIgnoreCase
```
public boolean equalsIgnoreCase(String string)
```
    Compares the given string to this string ignoring case.
    The strings are compared one char at a time. This is not suitable for case-insensitive string comparison for all locales. Use a Collator instead.
  - getBytes
```
@Deprecated
public void getBytes(int start,
                     int end,
                     byte[] data,
                     int index)
```
    Deprecated.
    Use getBytes() or getBytes(String)
    
    Mangles a subsequence of this string into a byte array by stripping the high order bits from each char. Use getBytes() or getBytes(String) instead.
    
    Parameters:
    
    start - the start offset in this string.
    
    end - the end+1 offset in this string.
    
    data - the destination byte array.
    
    index - the start 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 code points in 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 code points 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 code points 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 code points 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 given subsequence of this string to the given array starting at the given offset.
    
    Parameters:
    
    start - the start offset in this string.
    
    end - the end+1 offset in this string.
    
    buffer - the destination array.
    
    index - the start offset in the destination 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)
```
    Returns the first index of the given code point, or -1. The search starts at the beginning and moves towards the end of this string.
  - indexOf
```
public int indexOf(int c,
                   int start)
```
    Returns the next index of the given code point, or -1. The search starts at the given offset and moves towards the end of this string.
  - indexOf
```
public int indexOf(String string)
```
    Returns the first index of the given string, or -1. The search starts at the beginning and moves towards the end of this string.
    
    Throws:
    
    NullPointerException - if string is null.
  - indexOf
```
public int indexOf(String subString,
                   int start)
```
    Returns the next index of the given string in this string, or -1. The search for the string starts at the given offset and moves towards the end of this string.
    
    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 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 starts at offset start and moves towards the beginning of this string.
  - lastIndexOf
```
public int lastIndexOf(String string)
```
    Returns the index of the start of the last match for the given string in this string, or -1. The search for the string starts at the end and moves towards the beginning of this string.
    
    Throws:
    
    NullPointerException - if string is null.
  - lastIndexOf
```
public int lastIndexOf(String subString,
                       int start)
```
    Returns the index of the start of the previous match for the given string in this string, or -1. The search for the string starts at the given index and moves towards the beginning of this string.
    
    Throws:
    
    NullPointerException - if subString is null.
  - length
```
public int length()
```
    Returns the number of chars in this string. If this string contains surrogate pairs, this is not the same as the number of code points.
    
    Specified by:
    
    length in interface CharSequence
    
    Returns:
    
    the number of characters.
  - regionMatches
```
public boolean regionMatches(int thisStart,
                             String string,
                             int start,
                             int length)
```
    Returns true if the given subsequence of the given string matches this string starting at the given offset.
    
    Parameters:
    
    thisStart - the start offset in this string.
    
    string - the other string.
    
    start - the start offset in string.
    
    length - the number of chars to compare.
    
    Throws:
    
    NullPointerException - if string is null.
  - regionMatches
```
public boolean regionMatches(boolean ignoreCase,
                             int thisStart,
                             String string,
                             int start,
                             int length)
```
    Returns true if the given subsequence of the given string matches this string starting at the given offset.
    If ignoreCase is true, case is ignored during the comparison. The strings are compared one char at a time. This is not suitable for case-insensitive string comparison for all locales. Use a Collator instead.
    
    Parameters:
    
    ignoreCase - specifies if case should be ignored (use Collator instead for non-ASCII case insensitivity).
    
    thisStart - the start offset in this string.
    
    string - the other string.
    
    start - the start offset in string.
    
    length - the number of chars to compare.
    
    Throws:
    
    NullPointerException - if string is null.
  - replace
```
public String replace(char oldChar,
                      char newChar)
```
    Returns a copy of this string after replacing occurrences of the given char with another.
  - replace
```
public String replace(CharSequence target,
                      CharSequence replacement)
```
    Returns a copy of this string after replacing occurrences of target replaced with replacement. The string is processed from the beginning to the end.
    
    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 starting at start. The returned string shares this string's backing array.
    
    Throws:
    
    IndexOutOfBoundsException - if start < 0 or start > length().
  - substring
```
public String substring(int start,
                        int end)
```
    Returns a string containing the given subsequence of this string. The returned string shares this string's backing array.
    
    Parameters:
    
    start - the start offset.
    
    end - the end+1 offset.
    
    Throws:
    
    IndexOutOfBoundsException - if start < 0, start > end or end > length().
  - toCharArray
```
public char[] toCharArray()
```
    Returns a new char array containing a copy of the chars in this string. This is expensive and rarely useful. If you just want to iterate over the chars in the string, use charAt(int) instead.
  - 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()
```
    Returns a string with no code points <= \\u0020 at the beginning or end.
  - valueOf
```
public static String valueOf(char[] data)
```
    Returns a new string containing the same chars as the given array. Modifying the array after creating the string has no effect on the string.
    
    Throws:
    
    NullPointerException - if data is null.
  - valueOf
```
public static String valueOf(char[] data,
                             int start,
                             int length)
```
    Returns a new string containing the same chars as the given subset of the given array. Modifying the array after creating the string has no effect on the 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)
```
    Returns a new string of just the given char.
  - valueOf
```
public static String valueOf(double value)
```
    Returns the string representation of the given double.
  - valueOf
```
public static String valueOf(float value)
```
    Returns the string representation of the given float.
  - valueOf
```
public static String valueOf(int value)
```
    Returns the string representation of the given int.
  - valueOf
```
public static String valueOf(long value)
```
    Returns the string representation of the given long.
  - 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 sb)
```
    Returns true if the chars in the given StringBuffer are the same as those in this string.
    
    Throws:
    
    NullPointerException - if sb is null.
    
    Since:
    
    1.4
  - contentEquals
```
public boolean contentEquals(CharSequence cs)
```
    Returns true if the chars in the given CharSequence are the same as those in this string.
    
    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)
```
    Equivalent to substring(int, int) but needed to implement CharSequence.
    
    Specified by:
    
    subSequence in interface CharSequence
    
    Parameters:
    
    start - the start offset of the sub-sequence. It is inclusive, that is, the index of the first character that is included in the sub-sequence.
    
    end - the end offset of the sub-sequence. It is exclusive, that is, the index of the first character after those that are included in the sub-sequence
    
    Returns:
    
    the requested sub-sequence.
    
    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)
```
    Returns true if this string contains the charss from the given CharSequence.
    
    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

Class String

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

CASE_INSENSITIVE_ORDER

Constructor Detail

String

String

String

String

String

String

String

String

String

String

String

String

String

String

String

Method Detail

charAt

compareTo

compareToIgnoreCase

concat

copyValueOf

copyValueOf

endsWith

equals

equalsIgnoreCase

getBytes

getBytes

getBytes

getBytes

getChars

hashCode

indexOf

indexOf

indexOf

indexOf

intern

isEmpty

lastIndexOf

lastIndexOf

lastIndexOf

lastIndexOf

length

regionMatches

regionMatches

replace

replace

startsWith

startsWith

substring

substring

toCharArray

toLowerCase

toLowerCase

toString

toUpperCase

toUpperCase

trim

valueOf

valueOf

valueOf

valueOf

valueOf

valueOf

valueOf

valueOf

valueOf

contentEquals

contentEquals

matches

replaceAll

replaceFirst

split