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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