This post is older than a year. Consider some information might not be accurate anymore.
Check character type
char ch = 'a';
if (Character.isLetter(ch)) { // true
}
if (Character.isDigit(ch)) { // false
}
if (Character.isLowerCase(ch)) { // true
}
if (Character.isUpperCase(ch)) { // false
}
// See Character for more methods.
