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EnumSet complementOf() Method in Java

  • Last Updated : 03 Oct, 2018

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() 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 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:[]

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