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Hashtable clone() Method in Java

  • Last Updated : 28 Jun, 2018

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

Syntax:

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Hash_Table.clone()

Parameters: The method does not take any parameters.

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



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




// Java code to illustrate the clone() method
import java.util.*;
  
public class Hash_Table_Demo {
    public static void main(String[] args)
    {
        // Creating an empty Hashtable
        Hashtable<Integer, String> hash_table = new Hashtable<Integer, String>();
  
        // Putting values into the table
        hash_table.put(10, "Geeks");
        hash_table.put(15, "4");
        hash_table.put(20, "Geeks");
        hash_table.put(25, "Welcomes");
        hash_table.put(30, "You");
  
        // Displaying the Hashtable
        System.out.println("The Hashtable is: " + hash_table);
  
        // Displaying the cloned Hashtable using clone()
        System.out.println("The cloned table look like this: "
                           + hash_table.clone());
    }
}
Output:
The Hashtable is: {10=Geeks, 20=Geeks, 30=You, 15=4, 25=Welcomes}
The cloned table look like this: {10=Geeks, 20=Geeks, 30=You, 15=4, 25=Welcomes}

Program 2:




// Java code to illustrate the clone() method
import java.util.*;
  
public class Hash_Table_Demo {
    public static void main(String[] args)
    {
        // Creating an empty Hashtable
        Hashtable<String, Integer> hash_table = new Hashtable<String, Integer>();
  
        // Putting Values into the table
        hash_table.put("Geeks", 10);
        hash_table.put("4", 15);
        hash_table.put("Geeks", 20);
        hash_table.put("Welcomes", 25);
        hash_table.put("You", 30);
  
        // Displaying the Hashtable
        System.out.println("The Hashtable is: " + hash_table);
  
        // Displaying the cloned Hashtable using clone()
        System.out.println("The cloned table look like this: "
                           + hash_table.clone());
    }
}
Output:
The Hashtable is: {You=30, Welcomes=25, 4=15, Geeks=20}
The cloned table look like this: {You=30, Welcomes=25, 4=15, Geeks=20}

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




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