public class EnumTest {

    public static void main(String[] args) {
        Size s = Size.SMALL;
        Size t = Size.LARGE;

        System.out.println(s==t);

        System.out.println(s.getClass().isPrimitive());

        Size u = Size.valueOf("SMALL");
        System.out.println(s==u);

        for (Size value:Size.values()){
            System.out.println(value);
        }
    }
}
enum Size{SMALL, MEDIUM, LARGE};