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EnumSet noneOf() Method in Java
  • Last Updated : 02 Jul, 2018
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The java.util.EnumSet.noneOf(Class elementType) method in Java is used to create a null set of the type elementType.

Syntax:

public static <E extends Enum<E>> EnumSet<E> noneOf(Class<E> elementType)

Parameters: The method accepts one parameter elementType of element type and refers to the class object of the element type for this enum set.

Return Value: The method does not return any value.

Exceptions: The method throws NullPointerException if the elementType is Null.



Below programs illustrate the working of Java.util.EnumSet.noneOf() method:
Program 1:




// Java program to demonstrate noneof() 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 all elements from GFG
        EnumSet<GFG> e_set = EnumSet.allOf(GFG.class);
  
        // Displaying the initial EnumSet
        System.out.println("The first set is: " + e_set);
  
        // Creating another empty set
        EnumSet<GFG> other_set = EnumSet.noneOf(GFG.class);
  
        // Displaying the new set
        System.out.println("The other set is: " + other_set);
    }
}
Output:
The first set is: [Welcome, To, The, World, of, Geeks]
The other set is: []

Program 2:




// Java program to demonstrate copyOf() 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 initial EnumSet
        System.out.println("The first set is: " + e_set);
  
        // Creating another empty set
        EnumSet<CARS> other_set = EnumSet.noneOf(CARS.class);
  
        // Displaying the new set
        System.out.println("The other set is: " + other_set);
    }
}
Output:
The first set is: [RANGE_ROVER, MUSTANG, CAMARO, AUDI, BMW]
The other set is: []

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