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 program to demonstrate complementOf() methodimport java.util.*; // Creating an enum of GFG typeenum 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 program to demonstrate complementOf() methodimport java.util.*; // Creating an enum of CARS typeenum 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:[]
