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Java program to add Elements of an EnumSet collection to the other EnumSet collection

// Java program to add Elements of an EnumSet collection 
// to the other EnumSet collection

import java.util.*;

//Enum for color constants
enum COLORS {
  RED,
  GREEN,
  BLUE,
  BLACK,
  WHITE
};

public class Main {
  public static void main(String[] args) {
    EnumSet < COLORS > enumSet1 = EnumSet.noneOf(COLORS.class);
    EnumSet < COLORS > enumSet2 = EnumSet.noneOf(COLORS.class);

    enumSet1.add(COLORS.RED);
    enumSet1.add(COLORS.GREEN);
    enumSet1.add(COLORS.BLUE);

    enumSet2.add(COLORS.BLACK);
    enumSet2.add(COLORS.WHITE);

    System.out.println("Elements of enumSet1: " + enumSet1);
    System.out.println("Elements of enumSet2: " + enumSet2);

    enumSet1.addAll(enumSet2);

    System.out.println("\nElements of enumSet1: " + enumSet1);
    System.out.println("Elements of enumSet2: " + enumSet2);
  }
}

Output

Elements of enumSet1: [RED, GREEN, BLUE]
Elements of enumSet2: [BLACK, WHITE]

Elements of enumSet1: [RED, GREEN, BLUE, BLACK, WHITE]
Elements of enumSet2: [BLACK, WHITE]