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Java Hashtable clone() Method with Example

Hashtable Class clone() method: Here, we are going to learn about the clone() method of Hashtable Class with its syntax and example.
Submitted by Preeti Jain, on February 17, 2020

Hashtable Class clone() method

• clone() method is available in java.util package.
• clone() method is used to clone this Hashtable or in other words, it returns cloned copy or shallow copy of this Hashtable.
• clone() method is a non-static method, it is accessible with the class object and if we try to access the method with the class name then we will get an error.
• clone() method does not throw an exception at the time of returning the cloned object.

Syntax:

    public Object clone();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of the method is Object, it returns cloned copy of this Hashtable.

Example:

// Java program is to demonstrate the example of
// clone() method of Hashtable

import java.util.*;

public class CloneOfHashtable {
    public static void main(String[] args) {
        // Instantiate two hashtable object  
        Hashtable ht = new Hashtable();
        Hashtable clone_ht = new Hashtable();

        // By using put() method is to
        // add the linked values in an Hashtable
        ht.put(10, "C");
        ht.put(20, "C++");
        ht.put(30, "JAVA");
        ht.put(40, "PHP");
        ht.put(50, "SFDC");

        // Display Hashtable
        System.out.println("Hashtable: " + ht);

        // By using clone() method isto
        // clone this hashtable ht
        clone_ht = (Hashtable) ht.clone();

        // Display Cloned Hashtable
        System.out.println("ht.clone(): " + clone_ht);
    }
}

Output

Hashtable: {10=C, 20=C++, 30=JAVA, 40=PHP, 50=SFDC}
ht.clone(): {10=C, 20=C++, 30=JAVA, 40=PHP, 50=SFDC}