- Java.util Package Classes
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- Java.util - EnumMap
- Java.util - EnumSet
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- Java.util - GregorianCalendar
- Java.util - HashMap
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- 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.util.EnumSet.copyOf() Method
Description
The java.util.EnumSet.copyOf(Collection<E> c) method creates an enum set initialized from the specified collection.
Declaration
Following is the declaration for java.util.EnumSet.copyOf() method
public static <E extends Enum<E>> EnumSet<E>> copyOf(Collection<E> c)
Parameters
c − the collection from which to initialize this enum set.
Return Value
This method does not return any value.
Exception
IllegalArgumentException − if c is not an EnumSet instance and contains no elements
NullPointerException − if c is null
Example
The following example shows the usage of java.util.EnumSet.copyOf() method.
package com.tutorialspoint; import java.util.*; public class EnumSetDemo { // create an enum public enum Numbers { ONE, TWO, THREE, FOUR, FIVE }; public static void main(String[] args) { // create a new collection Collection collection = new ArrayList(); // print the collection System.out.println("Colletion :" + collection); // add two elements in the collection collection.add(Numbers.ONE); collection.add(Numbers.THREE); // create an EnumSet that is a copy of the collection EnumSet<Numbers> set = EnumSet.copyOf(collection); // print the set System.out.println("Set:" + set); } }
Let us compile and run the above program, this will produce the following result −
Colletion :[] Set:[ONE, THREE]
java_util_enumset.htm
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