X_Enums.java

/**
 * An Enum is a special type used to define collections of constants. Basically,
 * Enums define variables that represent members of a fixed set.
 */
public class X_Enums {
    enum Rank {
        SOLDIER, SERGEANT, CAPTAIN
    }

    public static void main(String[] args) {
        Rank a = Rank.SOLDIER;

        switch (a) {
            case SOLDIER:
                System.out.println("Soldier says hi!");
                break;
            case SERGEANT:
                System.out.println("Sergeant says Hello!");
                break;
            case CAPTAIN:
                System.out.println("Captain says Welcome!");
                break;
        }
        a = Rank.SERGEANT;
        switch (a) {
            case SOLDIER:
                System.out.println("Soldier says hi!");
                break;
            case SERGEANT:
                System.out.println("Sergeant says Hello!");
                break;
            case CAPTAIN:
                System.out.println("Captain says Welcome!");
                break;
        }
    }
}