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EnumSet allof() Method in Java

Last Updated : 02 Jul, 2018
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The Java.util.EnumSet.allOf(Class elementType) in Java is used to create an enum set that will be used to contain all of the elements in the specified elementType. Syntax: 
public static > EnumSet allOf(Class elementType)
Parameters: The method accepts one parameter elementType of element type and refers to the class object whose elements are to be stored into the 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.allOf() method: Program 1: Java 
// Java program to demonstrate allof() 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
        EnumSet<GFG> e_set = null;

        // Displaying the empty EnumSet
        System.out.println(e_set);

        // Getting all elements from GFG
        e_set = EnumSet.allOf(GFG.class);

        // Displaying the final set
        System.out.println("The updated set is:" + e_set);
    }
}
Output: 
null
The updated set is:[Welcome, To, The, World, of, Geeks]
Program 2: Java 
// Java program to demonstrate allof() 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
        EnumSet<CARS> e_set = null;

        // Displaying the empty EnumSet
        System.out.println(e_set);

        // Getting all elements from CARS
        e_set = EnumSet.allOf(CARS.class);

        // Displaying the final set
        System.out.println("The updated set is:" + e_set);
    }
}
Output: 
null
The updated set is:[RANGE_ROVER, MUSTANG, CAMARO, AUDI, BMW]

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