- Java.util Package Classes
- Java.util - Home
- Java.util - ArrayDeque
- Java.util - ArrayList
- Java.util - Arrays
- Java.util - BitSet
- Java.util - Calendar
- Java.util - Collections
- Java.util - Currency
- Java.util - Date
- Java.util - Dictionary
- Java.util - EnumMap
- Java.util - EnumSet
- Java.util - Formatter
- Java.util - GregorianCalendar
- Java.util - HashMap
- Java.util - HashSet
- Java.util - Hashtable
- Java.util - IdentityHashMap
- Java.util - LinkedHashMap
- Java.util - LinkedHashSet
- Java.util - LinkedList
- Java.util - ListResourceBundle
- Java.util - Locale
- Java.util - Observable
- Java.util - PriorityQueue
- Java.util - Properties
- Java.util - PropertyPermission
- Java.util - PropertyResourceBundle
- Java.util - Random
- Java.util - ResourceBundle
- Java.util - ResourceBundle.Control
- Java.util - Scanner
- Java.util - ServiceLoader
- Java.util - SimpleTimeZone
- Java.util - Stack
- Java.util - StringTokenizer
- Java.util - Timer
- Java.util - TimerTask
- Java.util - TimeZone
- Java.util - TreeMap
- Java.util - TreeSet
- Java.util - UUID
- Java.util - Vector
- Java.util - WeakHashMap
- Java.util Package Extras
- Java.util - Interfaces
- Java.util - Exceptions
- Java.util - Enumerations
- Java.util Useful Resources
- Java.util - Useful Resources
- Java.util - Discussion
Java EnumSet noneOf() Method
Description
The Java EnumSet noneOf(Class<E> elementType) method creates an empty enum set with the specified element type.
Declaration
Following is the declaration for java.util.EnumSet.noneOf() method
public static <E extends Enum<E>> EnumSet<E> noneOf(Class<E> elementType)
Parameters
elementType − the class object of the element type for this enum set.
Return Value
This method does not return any value.
Exception
NullPointerException − if elementType is null
Creating a Enumset Without Using given Enum Values Example
The following example shows the usage of Java EnumSet noneOf(Class) method to populate the EnumSet instance. We've created a enum Numbers. Then a EnumSet instance is created using a enum value. Using noneOf(Class) method, another enumSet is populated without values of enum and resulted enumSet is printed.
package com.tutorialspoint; import java.util.EnumSet; public class EnumSetDemo { // create an enum public enum Numbers { ONE, TWO, THREE, FOUR, FIVE }; public static void main(String[] args) { // create a set that contains all Numbers class EnumSet<Numbers> set1 = EnumSet.allOf(Numbers.class); // print set1 System.out.println("Set1:" + set1); // create a second set which is empty EnumSet<Numbers> set2 = EnumSet.noneOf(Numbers.class); // print the new set System.out.println("Set2:" + set2); } }
Output
Let us compile and run the above program, this will produce the following result −
Set1:[ONE, TWO, THREE, FOUR, FIVE] Set2:[]
Creating a Enumset Without Using given Enum with Value Example
The following example shows the usage of Java EnumSet noneOf(Class) method to populate the EnumSet instance. We've created a enum Numbers. Then a EnumSet instance is created using a enum value. Using noneOf(Class) method, another enumSet is populated without values of enum and resulted enumSet is printed.
package com.tutorialspoint; import java.util.EnumSet; public class EnumSetDemo { // create an enum public enum Number { ONE("1"), TWO("2"), THREE("3"), FOUR("4"), FIVE("5"); // instance variable for enum private String value; public String getValue() { return this.value; } // constructor should be private or protected private Number(String value) { this.value = value; } @Override public String toString() { return this.name() +"(" + this.value + ")"; } }; public static void main(String[] args) { // create a set that contains all Numbers class EnumSet<Number> set1 = EnumSet.allOf(Number.class); // print set1 System.out.println("Set1:" + set1); // create a second set which is empty EnumSet<Number> set2 = EnumSet.noneOf(Number.class); // print the new set System.out.println("Set2:" + set2); } }
Output
Let us compile and run the above program, this will produce the following result −
Set1:[ONE(1), TWO(2), THREE(3), FOUR(4), FIVE(5)] Set2:[]
To Continue Learning Please Login
Login with Google