EnumSet complementOf() Method in Java
Last Updated :
03 Oct, 2018
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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:
Java
Java
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);
}
}
// 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:
Program 2:
Initial set: [Welcome, To, Geeks] The updated set is:[The, World, of]
// 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);
}
}
// 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:[]
