EnumSets are specialised implementations of the Set interface for use with enum types. They inherit AbstractSet and implement the Set interface. Programming languages use enumerations to represent a set of constants. In an enum type, all possible values are known at compile-time, such as choices on a menu, rounding modes, command-line flags, etc. The constants in an enum type need not be fixed.
To perform various operations, an EnumSet uses various methods:
allOf (Class elementType)- In this method, all elements with the specified element type are created into an enum set.
noneOf (Class elementType)- By using this method, we can create a set of empty enumerations with a specified element type.
copyOf(Collection c)- In this method, an enum set is created that is initialised from the specified collection.
of(E e)- this method initialises an enum set by specifying a single element and creating it.
range (E from, E to)- The method creates an enum set that contains the range of elements specified.
clone()- A copy of a specific set is returned using this method.
An Example of EnumSet class
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import java.util.EnumSet; import java.util.Set; enum fruitz { BERRIES, KIWI, ORANGE, MANGO } public class EnumSet_Class_Example { public static void main(String[] args) { Set<fruitz> set1 = EnumSet.allOf(fruitz.class); System.out.println("My Favourite fruits:"+set1); Set<fruitz> set2 = EnumSet.noneOf(fruitz.class); System.out.println("My Worst Fruits:"+set2); } } |
Output:
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My Favourite fruits:[BERRIES, KIWI, ORANGE, MANGO] My Worst Fruits:[] |
Keywords: The Java EnumSet , Java Collections, Java
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