var c1 = 'A';
var isLetter = Character.isAlphabetic(c1);
var isNumber = Character.isDigit(c1);
//isLetter is true
//isNumber is false
var symbolList = "@#$%^&*";
var c2 = '$';
var isInList = symbolList.contains("" + c2);
//isInList is true
System.out.println("isLetter is " + isLetter);
System.out.println("isNumber is " + isNumber);
System.out.println("isInList is " + isInList);