Character

primitive

// 선언
Character c1 = 's';
Character c2 = 'k';

// 비교 
boolean b = c1 == c2;

// char to String
String str = char1 + "";

// char 문자인지 숫자인지 확인
System.out.println(Character.isLetter(c1));
System.out.println(Character.isDIgit(c1));