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What is the HashTable.clone() method in Java?

Sumit Sharma

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

The HashTable.clone() method is present in the HashTable class inside the java.util package. It is used to return the shallow copy of the given HashTable.

Parameters

HashTable.clone() does not take any parameters.

Return

HashTable.clone() returns the copy of HashTable.

Example

Let’s go over this with the help of an example.

Suppose we have a HashTable1 = {1 = Let's, 5 = see, 2 = Hashtable.clone(), 27 = method}

Upon using the HashTable.clone() method, we store the result in the object clone of HashTable1, and it returns the copy of HashTable1 and stores it in clone.

Code

Let’s look at the below code snippet to understand it better.

import java.util.*;
class Main
{
public static void main(String[] args)
{
Hashtable<Integer, String> h1 = new Hashtable<Integer, String>();
h1.put(1, "Let's");
h1.put(5, "see");
h1.put(2, "Hashtable.clone()");
h1.put(27, "method");
h1.put(9, "in java.");
System.out.println("The Hashtable is: " + h1);
System.out.println("The clone of specified HashTable is: " + h1.clone());
}
}
Using the HashTable.clone() method in Java

Explanation

  • In line 1, we import the required package.
  • In line 2, we make a Main class.
  • In line 4, we make a main function.
  • In line 6, we declare a HashTable consisting of Integer type keys and string type values.
  • In lines 8 to 12, we insert values in the Hashtable by using the Hashtable.put() method.
  • In line 14, we display the original Hashtable.
  • In line 15, we use the HashTable.clone() method to create the clone of HashTable and display the clone HashTable with a message.

In this way, we can use the HashTable.clone() method to return the shallow copy of the given HashTable.

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communitycreator
java

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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