how to check if char is a letter java code example

Example 1: how to make a char uppercase in java

char q = Character.toUpperCase('d');

Example 2: how to check if a char is a letter java

Character.isDigit(string.charAt(index)) //(JavaDoc) will return true if it's a digit
Character.isLetter(string.charAt(index)) //(JavaDoc) will return true if it's a letter