check character is alphanumeric java
javaCopypublic class CheckCharAlpha {
public static void main(String[] args) {
boolean letterOrDigit = isAlphaNumeric('k');
System.out.println(letterOrDigit);
}
public static boolean isAlphaNumeric(char char1) {
return (char1 >= 'a' && char1 <= 'z') || (char1 >= 'A' && char1 <= 'Z') || (char1 >= '0' && char1 <= '9');
}
}