java.lang · java.base · since Java 1.0

Character

declaration

public final class Character
        implements Comparable<Character>, Constable, Serializable

Box for char and the home of Unicode classification (isLetter, isDigit…) and code-point utilities that handle characters beyond the 16-bit range.

Key methods

`static boolean isLetter/isDigit/isWhitespace(int cp)`	Unicode-aware classification (prefer the int code-point overloads).
`static int toUpperCase/toLowerCase(int cp)`	Case mapping per Unicode (locale-free).
`static boolean isSurrogate(char c)`	Detects halves of supplementary characters.
`static int charCount(int cp)`	1 or 2 — chars needed for a code point.
`static String toString(int codePoint)`	Code point → String, surrogates handled.