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Showing content from https://docs.oracle.com/en/java/javase/20/docs/api/java.base/java/util/../lang/CharSequence.html below:

CharSequence (Java SE 20 & JDK 20)

All Known Subinterfaces:

Name

All Known Implementing Classes:

CharBuffer, Segment, String, StringBuffer, StringBuilder

public interface CharSequence

A

is a readable sequence of

values. This interface provides uniform, read-only access to many different kinds of

sequences. A

value represents a character in the

or a surrogate. Refer to

for details.

This interface does not refine the general contracts of the equals and hashCode methods. The result of testing two objects that implement CharSequence for equality is therefore, in general, undefined. Each object may be implemented by a different class, and there is no guarantee that each class will be capable of testing its instances for equality with those of the other. It is therefore inappropriate to use arbitrary CharSequence instances as elements in a set or as keys in a map.

Since:

1.4

• Method Summary

  char

  Returns the char value at the specified index.

  Returns a stream of int zero-extending the char values from this sequence.

  Returns a stream of code point values from this sequence.

  static int

  Compares two CharSequence instances lexicographically.

  default boolean

  Returns true if this character sequence is empty.

  int

  Returns the length of this character sequence.

  Returns a CharSequence that is a subsequence of this sequence.

  Returns a string containing the characters in this sequence in the same order as this sequence.

• Method Details
  • length

    int length()

    Returns the length of this character sequence. The length is the number of 16-bit chars in the sequence.

    Returns:

    the number of chars in this sequence

  • charAt

    char charAt(int index)

    Returns the

    char

    value at the specified index. An index ranges from zero to

    length() - 1

    . The first

    char

    value of the sequence is at index zero, the next at index one, and so on, as for array indexing.

    If the char value specified by the index is a surrogate, the surrogate value is returned.

    Parameters:

    index - the index of the char value to be returned

    Returns:

    the specified char value

    Throws:

    IndexOutOfBoundsException - if the index argument is negative or not less than length()

  • isEmpty

    default boolean isEmpty()

    Returns true if this character sequence is empty.

    Implementation Requirements:

    The default implementation returns the result of calling length() == 0.

    Returns:

    true if length() is 0, otherwise false

    Since:

    15

  • subSequence

    Returns a CharSequence that is a subsequence of this sequence. The subsequence starts with the char value at the specified index and ends with the char value at index end - 1. The length (in chars) of the returned sequence is end - start, so if start == end then an empty sequence is returned.

    Parameters:

    start - the start index, inclusive

    end - the end index, exclusive

    Returns:

    the specified subsequence

    Throws:

    IndexOutOfBoundsException - if start or end are negative, if end is greater than length(), or if start is greater than end

  • toString

    Returns a string containing the characters in this sequence in the same order as this sequence. The length of the string will be the length of this sequence.

    Overrides:

    toString in class Object

    Returns:

    a string consisting of exactly this sequence of characters

  • chars

    Returns a stream of

    int

    zero-extending the

    char

    values from this sequence. Any char which maps to a

    surrogate code point

    is passed through uninterpreted.

    The stream binds to this sequence when the terminal stream operation commences (specifically, for mutable sequences the spliterator for the stream is late-binding). If the sequence is modified during that operation then the result is undefined.

    Returns:

    an IntStream of char values from this sequence

    Since:

    1.8

  • codePoints

    Returns a stream of code point values from this sequence. Any surrogate pairs encountered in the sequence are combined as if by

    Character.toCodePoint

    and the result is passed to the stream. Any other code units, including ordinary BMP characters, unpaired surrogates, and undefined code units, are zero-extended to

    int

    values which are then passed to the stream.

    The stream binds to this sequence when the terminal stream operation commences (specifically, for mutable sequences the spliterator for the stream is late-binding). If the sequence is modified during that operation then the result is undefined.

    Returns:

    an IntStream of Unicode code points from this sequence

    Since:

    1.8

  • compare

    Compares two

    CharSequence

    instances lexicographically. Returns a negative value, zero, or a positive value if the first sequence is lexicographically less than, equal to, or greater than the second, respectively.

    The lexicographical ordering of CharSequence is defined as follows. Consider a CharSequence cs of length len to be a sequence of char values, cs[0] to cs[len-1]. Suppose k is the lowest index at which the corresponding char values from each sequence differ. The lexicographic ordering of the sequences is determined by a numeric comparison of the char values cs1[k] with cs2[k]. If there is no such index k, the shorter sequence is considered lexicographically less than the other. If the sequences have the same length, the sequences are considered lexicographically equal.

    Parameters:

    cs1 - the first CharSequence

    cs2 - the second CharSequence

    Returns:

    the value 0 if the two CharSequence are equal; a negative integer if the first CharSequence is lexicographically less than the second; or a positive integer if the first CharSequence is lexicographically greater than the second.

    Since:

    11

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