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| Utility methods for ASCII character checking. |
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/**
* Utility methods for ASCII character checking.
*/
public class ASCIIUtil {
/**
* Checks whether the supplied character is a letter or number.
*/
public static boolean isLetterOrNumber(int c) {
return isLetter(c) || isNumber(c);
}
/**
* Checks whether the supplied character is a letter.
*/
public static boolean isLetter(int c) {
return isUpperCaseLetter(c) || isLowerCaseLetter(c);
}
/**
* Checks whether the supplied character is an upper-case letter.
*/
public static boolean isUpperCaseLetter(int c) {
return (c >= 65 && c <= 90); // A - Z
}
/**
* Checks whether the supplied character is an lower-case letter.
*/
public static boolean isLowerCaseLetter(int c) {
return (c >= 97 && c <= 122); // a - z
}
/**
* Checks whether the supplied character is a number
*/
public static boolean isNumber(int c) {
return (c >= 48 && c <= 57); // 0 - 9
}
}
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| Related examples in the same category |
| 1. | Convert Encoding | | | | 2. | Utility class for working with character sets | | | | 3. | Reader for UCS-2 and UCS-4 encodings. (i.e., encodings from ISO-10646-UCS-(2|4)). | | | | 4. | Conversions between IANA encoding names and Java encoding names, and vice versa. | | | | 5. | ASCII character handling functions | | | | 6. | This class represents an encoding. | | | | 7. | Provides information about encodings. | | | | 8. | Codec for the Quoted-Printable section of http://www.ietf.org/rfc/rfc1521.txt (RFC 1521) | | | | 9. | ISO 8859-8, ASCII plus Hebrew | | | | 10. | TIS-620 does not have the non-breaking space or the C1 controls. | | | | 11. | ISO-8859-1; a.k.a. Latin-1 | | | | 12. | ISO 8859-2, a.k.a. Latin-2 | | | | 13. | ISO 8859-3 | | | | 14. | ISO 8859-4, Latin plus the characters needed for Greenlandic, Icelandic, and Lappish. | | | | 15. | ISO 8859-9 for Turkish. | | | | 16. | ISO-8859-10, for Lithuanian, Estonian, Greenlandic, Icelandic, Inuit, Lappish, and other Northern European languages. | | | | 17. | ISO-8859-13, for Latvian and other Baltic languages. | | | | 18. | ISO-8859-14, for Gaelic, Welsh, and other Celtic languages. | | | | 19. | ISO 8859-9 for Western Europe. Includes the Euro sign and several uncommon French letters | | | | 20. | ISO 8859-16, Romanian | | | | 21. | ASCII Writer | | | | 22. | UCS Writer | | | | 23. | Unicode Writer | | | | 24. | Whether a character is or is not available in a particular encoding | | | | 25. | ISO 8859-6, ASCII plus Arabic | | | | 26. | ISO 8859-5, ASCII plus Cyrillic (Russian, Byelorussian, etc.) | | | | 27. | ISO 8859-7, ASCII plus Greek | | | | 28. | IANA to Java Mapping | | | | 29. | Java to IANA Mapping | | | | 30. | EncodingMap is a convenience class which handles conversions between IANA encoding names and Java encoding names, and vice versa. | | |
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