Package java.lang

Interface CharSequence

All Known Implementing Classes:
CharBuffer, String, StringBuffer, StringBuilder
public interface CharSequence
This interface represents an ordered set of characters and defines the methods to probe them.

  • Method Summary

    Modifier and Type Method Description
    char charAt​(int index)
    Returns the character at the specified index, with the first character having index zero.
    int length()
    Returns the number of characters in this sequence.
    CharSequence subSequence​(int start, int end)
    Returns a CharSequence from the start index (inclusive) to the end index (exclusive) of this sequence.
    String toString()
    Returns a string with the same characters in the same order as in this sequence.

  • Method Details

    • length

      int length()
      Returns the number of characters in this sequence.
      Returns:
      the number of characters.

    • charAt

      char charAt​(int index)
      Returns the character at the specified index, with the first character having index zero.
      Parameters:
      index - the index of the character to return.
      Returns:
      the requested character.
      Throws:
      IndexOutOfBoundsException - if index < 0 or index is greater than the length of this sequence.

    • subSequence

      CharSequence subSequence​(int start, int end)
      Returns a CharSequence from the start index (inclusive) to the end index (exclusive) of this sequence.
      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 if start or end are greater than the length of this sequence.

    • toString

      String toString()
      Returns a string with the same characters in the same order as in this sequence.
      Overrides:
      toString in class Object
      Returns:
      a string based on this sequence.