Java EnumSet clone() Method

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Description

The Java EnumSet clone() method returns a copy of this set.

Declaration

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

public EnumSet<E> clone()

Parameters

NA

Return Value

This method returns a copy of this set.

Exception

NA

Creating a Clone of EnumSet Example

The following example shows the usage of Java EnumSet clone() method to clone the EnumSet instance. We've created a enum Numbers. Then a EnumSet instance is created. Using allOf() method, enumSet is populated with values of enum and resulted enumSet is printed. Then using clone() method, its clone is created and 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 an EnumSet that has all elements from Numbers 
      EnumSet<Numbers> set1 = EnumSet.allOf(Numbers.class);

      // print the set
      System.out.println("Set1:" + set1);

      // create a set2 which is a copy of set1
      EnumSet<Numbers> set2 = set1.clone();

      // print the updated 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:[ONE, TWO, THREE, FOUR, FIVE]

Creating a Clone of EnumSet of Enum with Values Example

The following example shows the usage of Java EnumSet clone() method to clone the EnumSet instance. We've created a enum Numbers with assigned values. Then a EnumSet instance is created. Using allOf() method, enumSet is populated with values of enum and resulted enumSet is printed. Then using clone() method, its clone is created and 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 an EnumSet that has all elements from Number 
      EnumSet<Number> set1 = EnumSet.allOf(Number.class);

      // print the set
      System.out.println("Set1:" + set1);

      // create a set2 which is a copy of set1
      EnumSet<Number> set2 = set1.clone();

      // print the updated 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:[ONE(1), TWO(2), THREE(3), FOUR(4), FIVE(5)]