Java EnumMap clone() Method

Description

The Java EnumMap clone() method returns a copy of this enum map.

Declaration

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

public EnumMap<K,V> clone()

Parameters

NA

Return Value

This method returns a shallow copy of this enum map.

Exception

NA

Cloning an EnumMap of Enum, Integer Pairs Example

The following example shows the usage of Java EnumMap clone() method to clone the EnumMap instance. We've created a enum Numbers. Then Two EnumMap instance are created of enum Numbers and Integer. Few entries are added and enumMap is printed. Using clone() method, enumMap is cloned and printed.

package com.tutorialspoint;

import java.util.EnumMap;

public class EnumMapDemo {
   
   // create an enum
   public enum Numbers{ONE, TWO, THREE, FOUR, FIVE}; 

   public static void main(String[] args) {
      
      EnumMap<Numbers,Integer> map = 
         new EnumMap<>(Numbers.class);
		 
      EnumMap<Numbers,Integer> map2 = 
         new EnumMap<>(Numbers.class);

      // associate values in map
      map.put(Numbers.ONE, 1);
      map.put(Numbers.TWO, 2);
      map.put(Numbers.THREE,3);
      map.put(Numbers.FOUR, 4);

      // print the whole map
      System.out.println(map); 

      // clone the map
      map2 = map.clone();

      // print the clone map as map2
      System.out.println(map2); 
   }
}

Output

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

{ONE=1, TWO=2, THREE=3, FOUR=4}
{ONE=1, TWO=2, THREE=3, FOUR=4}

Cloning an EnumMap of Enum, String Pairs Example

The following example shows the usage of Java EnumMap clone() method to clone the EnumMap instance. We've created a enum Numbers. Then Two EnumMap instance are created of enum Numbers and String. Few entries are added and enumMap is printed. Using clone() method, enumMap is cloned and printed.

package com.tutorialspoint;

import java.util.EnumMap;

public class EnumMapDemo {
   
   // create an enum
   public enum Numbers{ONE, TWO, THREE, FOUR, FIVE}; 

   public static void main(String[] args) {
      
      EnumMap<Numbers,String> map = 
         new EnumMap<>(Numbers.class);

      EnumMap<Numbers,String> map2 = 
         new EnumMap<>(Numbers.class);
		 
      // associate values in map
      map.put(Numbers.ONE, "1");
      map.put(Numbers.TWO, "2");
      map.put(Numbers.THREE,"3");
      map.put(Numbers.FOUR, "4");

      // print the whole map
      System.out.println(map); 

      // clone the map
      map2 = map.clone();

      // print the clone map as map2
      System.out.println(map2);  
   }
}

Output

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

{ONE=1, TWO=2, THREE=3, FOUR=4}
{ONE=1, TWO=2, THREE=3, FOUR=4}

Cloning an EnumMap of Enum, Object Pairs Example

The following example shows the usage of Java EnumMap clone() method to clone the EnumMap instance. We've created a enum Numbers. Then Two EnumMap instance are created of enum Numbers and Student objects. Few entries are added and enumMap is printed. Using clone() method, enumMap is cloned and printed.

package com.tutorialspoint;

import java.util.EnumMap;

public class EnumMapDemo {
   
   // create an enum
   public enum Numbers{ONE, TWO, THREE, FOUR, FIVE}; 

   public static void main(String[] args) {
      
      EnumMap<Numbers,Student> map = 
         new EnumMap<>(Numbers.class);

      EnumMap<Numbers,Student> map2 = 
         new EnumMap<>(Numbers.class);
		 
      // associate values in map
      map.put(Numbers.ONE, new Student(1, "Julie"));
      map.put(Numbers.TWO, new Student(2, "Robert"));
      map.put(Numbers.THREE,new Student(3, "Adam"));
      map.put(Numbers.FOUR, new Student(4, "Jene"));

      // print the whole map
      System.out.println(map); 

      // clone the map
      map2 = map.clone();

      // print the clone map as map2
      System.out.println(map2);  
   }
}
class Student {
   int rollNo;
   String name;

   Student(int rollNo, String name){
      this.rollNo = rollNo;
      this.name = name;
   }

   @Override
   public String toString() {
      return "[ " + this.rollNo + ", " + this.name + " ]";
   }
}

Output

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

{ONE=[ 1, Julie ], TWO=[ 2, Robert ], THREE=[ 3, Adam ], FOUR=[ 4, Jene ]}
{ONE=[ 1, Julie ], TWO=[ 2, Robert ], THREE=[ 3, Adam ], FOUR=[ 4, Jene ]}