java tutorial - Java EnumSet class - java programming - learn java - java basics - java for beginners
Learn Java - Java tutorial - Java enumset - Java examples - Java programs
- Java EnumSet class is the specialized Set implementation for use with enum types. It inherits AbstractSet class and implements the Set interface.
EnumSet class hierarchy
The hierarchy of EnumSet class is given in the figure given below.
Learn java - java tutorial - enumset - java examples - java programs
EnumSet class declaration
Let's see the declaration for java.util.EnumSet class.
public abstract class EnumSet<E extends Enum<E>> extends AbstractSet<E> implements Cloneable, Serializable click below button to copy the code. By - java tutorial - team
Methods of Java EnumSet class
| Method | Description |
|---|---|
| static <E extends Enum<E>> EnumSet<E> allOf(Class<E> elementType) | It is used to create an enum set containing all of the elements in the specified element type. |
| static <E extends Enum<E>> EnumSet<E> copyOf(Collection<E> c) | It is used to create an enum set initialized from the specified collection. |
| static <E extends Enum<E>> EnumSet<E> noneOf(Class<E> elementType) | It is used to create an empty enum set with the specified element type. |
| static <E extends Enum<E>> EnumSet<E> of(E e) | It is used to create an enum set initially containing the specified element. |
| static <E extends Enum<E>> EnumSet<E> range(E from, E to) | It is used to create an enum set initially containing the specified elements. |
| EnumSet<E> clone() | It is used to return a copy of this set. |
Java EnumSet Example
import java.util.*;
enum days {
SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY
}
public class EnumSetExample {
public static void main(String[] args) {
Set<days> set = EnumSet.of(days.TUESDAY, days.WEDNESDAY);
// Traversing elements
Iterator<days> iter = set.iterator();
while (iter.hasNext())
System.out.println(iter.next());
}
} click below button to copy the code. By - java tutorial - team
Output:
TUESDAY
WEDNESDAYJava EnumSet Example: allOf() and noneOf()
import java.util.*;
enum days {
SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY
}
public class EnumSetExample {
public static void main(String[] args) {
Set<days> set1 = EnumSet.allOf(days.class);
System.out.println("Week Days:"+set1);
Set<days> set2 = EnumSet.noneOf(days.class);
System.out.println("Week Days:"+set2);
}
} click below button to copy the code. By - java tutorial - team
Output:
Week Days:[SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY]
Week Days:[]