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IdentityHashMap clone() Method in Java

  • Last Updated : 23 Jul, 2018

The java.util.IdentityHashMap.clone() method is used to return a shallow copy of the mentioned hash map. It just creates a copy of the map.

Syntax:

Identity_HashMap.clone()

Parameters: The method does not take any parameters.

Return Value: The method just returns a copy of the hash map.

Below programs are used to illustrate the working of java.util.IdentityHashMap.clone() Method:
Program 1:






// Java code to illustrate the clone() method
import java.util.*;
  
public class Identity_Hash_Map_Demo {
    public static void main(String[] args)
    {
  
        // Creating an empty IdentityHashMap
        IdentityHashMap<Integer, String> identity_hash = 
                      new IdentityHashMap<Integer, String>();
  
        // Mapping string values to int keys
        identity_hash.put(10, "Geeks");
        identity_hash.put(15, "4");
        identity_hash.put(20, "Geeks");
        identity_hash.put(25, "Welcomes");
        identity_hash.put(30, "You");
  
        // Displaying the IdentityHashMap
        System.out.println("Initial Mappings are: "
                                            identity_hash);
  
        // Displaying the cloned Map using clone()
        System.out.println("The cloned map: "
                                    identity_hash.clone());
    }
}
Output:
Initial Mappings are: {10=Geeks, 30=You, 20=Geeks, 25=Welcomes, 15=4}
The cloned map: {10=Geeks, 30=You, 20=Geeks, 25=Welcomes, 15=4}

Program 2:




// Java code to illustrate the clone() method
import java.util.*;
  
public class Identity_Hash_Map_Demo {
    public static void main(String[] args)
    {
  
        // Creating an empty hash map
        IdentityHashMap<String, Integer> identity_hash = 
                  new IdentityHashMap<String, Integer>();
  
        // Mapping int values to string keys
        identity_hash.put("Geeks", 10);
        identity_hash.put("4", 15);
        identity_hash.put("Geeks", 20);
        identity_hash.put("Welcomes", 25);
        identity_hash.put("You", 30);
  
        // Displaying the IdentityHashMap
        System.out.println("Initial Mappings are: "
                                         identity_hash);
  
        // Displaying the cloned map using clone()
        System.out.println("The cloned map: "
                                 identity_hash.clone());
    }
}
Output:
Initial Mappings are: {Geeks=20, Welcomes=25, You=30, 4=15}
The cloned map: {Geeks=20, Welcomes=25, You=30, 4=15}

Note: The same operation can be performed with any type of Mappings with variation and combination of different data types.

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