EnumSet complementOf() Method in Java Last Updated : 03 Oct, 2018 Comments Improve Suggest changes Like Article Like Report The java.util.EnumSet.complementOf(Enum_Set) method is used to create an EnumSet containing elements of the same type as that of the specified Enum_Set, with the values present in the enum but other than those contained in the specified Enum_Set. Syntax: New_Enum_Set = EnumSet.complementOf(Enum_Set) Parameters: The method accepts one parameter Enum_Set whose values are to be neglected while populating the values into the new complemented enum set. Return Values: The method does not return any values. Exceptions: The method throws NullPointerException if the value Enum_Set is NULL. Below programs illustrate the working of java.util.EnumSet.complementOf() method: Program 1: Java // Java program to demonstrate complementOf() method import java.util.*; // Creating an enum of GFG type enum GFG { Welcome, To, The, World, of, Geeks } ; public class Enum_Set_Demo { public static void main(String[] args) { // Creating an empty EnumSet // Getting elements from GFG EnumSet<GFG> e_set = EnumSet.of(GFG.To, GFG.Welcome, GFG.Geeks); // Displaying the empty EnumSet System.out.println("Initial set: " + e_set); // Cloning the set EnumSet<GFG> final_set = EnumSet.complementOf(e_set); // Displaying the final set System.out.println("The updated set is:" + final_set); } } Output: Initial set: [Welcome, To, Geeks] The updated set is:[The, World, of] Program 2: Java // Java program to demonstrate complementOf() method import java.util.*; // Creating an enum of CARS type enum CARS { RANGE_ROVER, MUSTANG, CAMARO, AUDI, BMW } ; public class Enum_Set_Demo { public static void main(String[] args) { // Creating an empty EnumSet // Getting all elements from CARS EnumSet<CARS> e_set = EnumSet.allOf(CARS.class); // Displaying the empty EnumSet System.out.println("Initial set: " + e_set); // Cloning the set EnumSet<CARS> final_set = EnumSet.complementOf(e_set); // Displaying the final set System.out.println("The updated set is:" + final_set); } } Output: Initial set: [RANGE_ROVER, MUSTANG, CAMARO, AUDI, BMW] The updated set is:[] Comment More infoAdvertise with us Next Article EnumSet copyOf() Method in Java chinmoy lenka Follow Improve Article Tags : Misc Java java-EnumSet complement Practice Tags : JavaMisc Similar Reads EnumSet in Java In Java, the EnumSet is a specialized set implementation for use with enum types. 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Below programs illustrate the working of Java.ut 2 min read EnumSet complementOf() Method in Java The java.util.EnumSet.complementOf(Enum_Set) method is used to create an EnumSet containing elements of the same type as that of the specified Enum_Set, with the values present in the enum but other than those contained in the specified Enum_Set. Syntax: New_Enum_Set = EnumSet.complementOf(Enum_Set) 2 min read EnumSet copyOf() Method in Java The java.util.EnumSet.copyOf(Collection collect) method in Java is used to copy all of the contents from a collection to a new enum set. At first, the collection is made out of the elements of the enum and then a new enum set is created, which is the copy of the collection. Syntax: New_Enum_Set = En 3 min read Java EnumSet noneOf() Method The EnumSet.noneOf() method is a part of java.util package. This method is used to create an empty EnumSet for a given enum type. 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