What is the HashTable.clone() method in Java?
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());}}
Explanation
- In line 1, we import the required package.
- In line 2, we make a
Mainclass. - In line 4, we make a
mainfunction. - In line 6, we declare a
HashTableconsisting ofIntegertype keys andstringtype values. - In lines 8 to 12, we insert values in the
Hashtableby using theHashtable.put()method. - In line 14, we display the original
Hashtable. - In line 15, we use the
HashTable.clone()method to create the clone ofHashTableand display the cloneHashTablewith 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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