# Class CharSequenceUtils

java.lang.Object
org.apache.commons.lang3.CharSequenceUtils

public class CharSequenceUtils extends Object
Operations on `CharSequence` that are `null` safe.

Since:
  3.0
See Also:
  - `CharSequence`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `CharSequenceUtils()`
  Deprecated.
  TODO Make private in 4.0.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `static CharSequence`
  `subSequence(CharSequence cs, int start)`
  Returns a new `CharSequence` that is a subsequence of this sequence starting with the `char` value at the specified index.
  `static char[]`
  `toCharArray(CharSequence source)`
  Converts the given CharSequence to a char[].

  ### Methods inherited from class Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- ## Constructor Details

  - ### CharSequenceUtils

    @Deprecated public CharSequenceUtils()
    Deprecated.
    TODO Make private in 4.0.
    `CharSequenceUtils` instances should NOT be constructed in standard programming.

    This constructor is public to permit tools that require a JavaBean instance to operate.

- ## Method Details

  - ### subSequence

    public static CharSequence subSequence(CharSequence cs, int start)
    Returns a new `CharSequence` that is a subsequence of this sequence starting with the `char` value at the specified index.

    This provides the `CharSequence` equivalent to `String.substring(int)`. The length (in `char`) of the returned sequence is `length() - start`, so if `start == end` then an empty sequence is returned.

    Parameters:
      `cs` - the specified subsequence, null returns null
      `start` - the start index, inclusive, valid
    Returns:
      a new subsequence, may be null
    Throws:
      `IndexOutOfBoundsException` - if `start` is negative or if `start` is greater than `length()`

  - ### toCharArray

    public static char[] toCharArray(CharSequence source)
    Converts the given CharSequence to a char[].
    Parameters:
      `source` - the `CharSequence` to be processed.
    Returns:
      the resulting char array, never null.
    Since:
      3.11