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);
}
} |
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);
}
} |
Initial set: [RANGE_ROVER, MUSTANG, CAMARO, AUDI, BMW] The updated set is:[]