Java.util.EnumSet.copyOf() Method

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Description

The java.util.EnumSet.copyOf(EnumSet<E> s) method creates an enum set with the same element type as the specified enum set.It contains the same elements (if any).

Declaration

Following is the declaration for java.util.EnumSet.copyOf() method

public static <E extends Enum<E>> EnumSet<E> copyOf(EnumSet<E> s)

Parameters

  • s-- the enum set from which to initialize this enum set.

Return Value

This method does not return any value.

Exception

  • NullPointerException-- if s 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 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 a copy of set1
      EnumSet<Numbers> set2 = EnumSet.copyOf(set1);

      // print the new set
      System.out.println("Set2:" + set2);

   }
}

Let us compile and run the above program, this will produce the following result:

Set1:[ONE, TWO, THREE, FOUR, FIVE]
Set2:[ONE, TWO, THREE, FOUR, FIVE]



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