java/lang/Character.java

42  * a character's category (lowercase letter, digit, etc.) and for converting
130      * {@code digit} method, the {@code forDigit} method, and the
133      * @see     Character#digit(char, int)
144      * {@code digit} method, the {@code forDigit} method, and the
147      * @see     Character#digit(char, int)
8526      * Determines if the specified character is a digit.
8528      * A character is a digit if its general category type, provided
8554      * @return  {@code true} if the character is a digit;
8556      * @see     Character#digit(char, int)
8565      * Determines if the specified character (Unicode code point) is a digit.
8567      * A character is a digit if its general category type, provided
8588      * @return  {@code true} if the character is a digit;
8729      * Determines if the specified character is a letter or digit.
8731      * A character is considered to be a letter or digit if either
8742      * @return  {@code true} if the character is a letter or digit;
8757      * Determines if the specified character (Unicode code point) is a letter or digit.
8759      * A character is considered to be a letter or digit if either
8765      * @return  {@code true} if the character is a letter or digit;
8823      * <li>  it is a digit
8965      * <li>  it is a digit
9002      * <li>  it is a digit
9087      * <li>  it is a digit
9122      * <li>  it is a digit
9392      * value of {@code ch} is not a valid digit in the specified
9393      * radix, {@code -1} is returned. A character is a valid digit
9397      *     and the Unicode decimal digit value of the character (or its
9399      *     In this case the decimal digit value is returned.
9427      * the {@link #digit(int, int)} method.
9436     public static int digit(char ch, int radix) {
9437         return digit((int)ch, radix);
9446      * character is not a valid digit in the specified
9447      * radix, {@code -1} is returned. A character is a valid digit
9451      *     and the Unicode decimal digit value of the character (or its
9453      *     In this case the decimal digit value is returned.
9488     public static int digit(int codePoint, int radix) {
9489         return CharacterData.of(codePoint).digit(codePoint, radix);
9863      * Determines the character representation for a specific digit in
9865      * valid radix, or the value of {@code digit} is not a valid
9866      * digit in the specified radix, the null character
9871      * {@code MAX_RADIX}. The {@code digit} argument is valid if
9872      * {@code 0 <= digit < radix}.
9874      * If the digit is less than 10, then
9875      * {@code '0' + digit} is returned. Otherwise, the value
9876      * {@code 'a' + digit - 10} is returned.
9878      * @param   digit   the number to convert to a character.
9880      * @return  the {@code char} representation of the specified digit
9884      * @see     Character#digit(char, int)
9886     public static char forDigit(int digit, int radix) {
9887         if ((digit >= radix) || (digit < 0)) {
9893         if (digit < 10) {
9894             return (char)('0' + digit);
9896         return (char)('a' - 10 + digit);