EnumSet in Java

// Java Program to Illustrate Working
// of EnumSet and its functions

// Importing required classes
import java.util.EnumSet;

// Enum
enum Gfg { CODE, LEARN, CONTRIBUTE, QUIZ, MCQ };

// Main class
// EnumSetExample
public class GFG {

    // Main driver method
    public static void main(String[] args) {

        // Creating a set
        EnumSet<Gfg> set1, set2, set3, set4;

        // Adding elements
        set1 = EnumSet.of(Gfg.QUIZ, Gfg.CONTRIBUTE,
                          Gfg.LEARN, Gfg.CODE);
        set2 = EnumSet.complementOf(set1);
        set3 = EnumSet.allOf(Gfg.class);
        set4 = EnumSet.range(Gfg.CODE, Gfg.CONTRIBUTE);

        // Printing corresponding elements in Sets
        System.out.println("Set 1: " + set1);
        System.out.println("Set 2: " + set2);
        System.out.println("Set 3: " + set3);
        System.out.println("Set 4: " + set4);
    }
}

// Java Program to illustrate Creation an EnumSet

// Importing required classes
import java.util.*;

// Main class
// CreateEnumSet
class GFG {

    // Enum
    enum Game { CRICKET, HOCKEY, TENNIS }

    // Main driver method
    public static void main(String[] args)
    {

        // Creating an EnumSet using allOf()
        EnumSet<Game> games = EnumSet.allOf(Game.class);

        // Printing EnumSet elements to the console
        System.out.println("EnumSet: " + games);
    }
}

// Java program to illustrate Addition of Elements
// to an EnumSet

// Importing required classes
import java.util.EnumSet;

// Main class
class AddElementsToEnumSet {

    // Enum
    enum Game { CRICKET, HOCKEY, TENNIS }

    // Main driver method
    public static void main(String[] args)
    {

        // Creating an EnumSet
        // using allOf()
        EnumSet<Game> games1 = EnumSet.allOf(Game.class);

        // Creating an EnumSet
        // using noneOf()
        EnumSet<Game> games2 = EnumSet.noneOf(Game.class);

        // Using add() method
        games2.add(Game.HOCKEY);

        // Printing the elements to the console
        System.out.println("EnumSet Using add(): "
                           + games2);

        // Using addAll() method
        games2.addAll(games1);

        // Printing the elements to the console
        System.out.println("EnumSet Using addAll(): "
                           + games2);
    }
}

// Java program to Access Elements of EnumSet

// Importing required classes
import java.util.EnumSet;
import java.util.Iterator;

// Main class
// AccessingElementsOfEnumSet
class GFG {

    // Enum
    enum Game { CRICKET, HOCKEY, TENNIS }

    // MAin driver method
    public static void main(String[] args)
    {
        // Creating an EnumSet using allOf()
        EnumSet<Game> games = EnumSet.allOf(Game.class);

        // Creating an iterator on games
        Iterator<Game> iterate = games.iterator();

        // Display message
        System.out.print("EnumSet: ");

        while (iterate.hasNext()) {

            // Iterating and printing elements to
            // the console using next() method
            System.out.print(iterate.next());
            System.out.print(", ");
        }
    }
}

// Java program to Remove Elements
// from a EnumSet

// Importing required classes
import java.util.EnumSet;

// Main class
// RemovingElementsOfEnumSet
class GFG {

    // Enum
    enum Game { CRICKET, HOCKEY, TENNIS }

    // Main driver method
    public static void main(String[] args)
    {
        // Creating EnumSet using allOf()
        EnumSet<Game> games = EnumSet.allOf(Game.class);

        // Printing the EnumSet
        System.out.println("EnumSet: " + games);

        // Using remove()
        boolean value1 = games.remove(Game.CRICKET);

        // Printing elements to the console
        System.out.println("Is CRICKET removed? " + value1);

        // Using removeAll() and storing the boolean result
        boolean value2 = games.removeAll(games);

        // Printing elements to the console
        System.out.println("Are all elements removed? "
                           + value2);
    }
}