Mega Code Archive
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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