EnumSet allof() Method in Java (original) (raw)

Last Updated : 02 Jul, 2018

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]