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Vector clone() Method in Java with Examples

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  • Difficulty Level : Basic
  • Last Updated : 08 Nov, 2021

The clone() method of the Vector class is used to return a shallow copy of this vector provided by the Object class. It just creates a copy of the vector. The copy will have a reference to a clone of the internal data array but not a reference to the original internal data array.

Syntax: 

Vector.clone()

Parameters: The method does not take any parameters.

Return Value: The method returns an Object which is just the copy of the vector. 

Exception Thrown: CloneNotSupportedException: This exception is thrown if the object’s class does not support the Cloneable interface.

Example 1:

Java




// Java Program to Illustrate clone() method of Vector class
 
// Importing required classes
import java.util.*;
 
// Main class
// VectorDemo
public class GFG {
 
    // Main driver method
    public static void main(String args[])
    {
 
        // Creating an empty Vector by creating object
        // of vector class of string type
        Vector<String> vec_tor = new Vector<String>();
 
        // Adding custom input elements into the vector
        // using add() method
        vec_tor.add("Welcome");
        vec_tor.add("To");
        vec_tor.add("Geeks");
        vec_tor.add("For");
        vec_tor.add("Geeks");
 
        // Print and display all vector elements
        System.out.println("Vector: " + vec_tor);
 
        // Creating another vector to copy by
        // creating an object of Object class
        Object copy_vector = vec_tor.clone();
 
        // Print and display the cloned vector elements
        System.out.println("The cloned vector is: "
                           + copy_vector);
    }
}

Output

Vector: [Welcome, To, Geeks, For, Geeks]
The cloned vector is: [Welcome, To, Geeks, For, Geeks]

Example 2:

Java




// Java Program to Illustrate clone() method of Vector class
 
// Importing required classes
import java.util.*;
 
// Main class
// VectorDemo
public class VectorDemo {
   
    // Main driver method
    public static void main(String args[])
    {
        // Creating an empty Vector by creating
       // object of Vector class of Integer type
        Vector<Integer> vec_tor = new Vector<Integer>();
 
        // Add custom input elements for 
        // using add() method
        vec_tor.add(10);
        vec_tor.add(15);
        vec_tor.add(30);
        vec_tor.add(20);
        vec_tor.add(5);
 
        // Print and display the vector elements
        System.out.println("Vector: " + vec_tor);
 
        // Creating another vector to copy by
        // creating object of Object class
        Object copy_vector = (Vector)vec_tor.clone();
 
        // Print and display elements of cloned vector
        System.out.println("The cloned vector is: " + copy_vector);
    }
}

Output

Vector: [10, 15, 30, 20, 5]
The cloned vector is: [10, 15, 30, 20, 5]

Note: In the above examples we have cloned vectors by creating objects of Object class itself as it does provide clone() method. So if object classes are not supporting any cloneable interface then it will not allow to clone and copy vector elements so does it will throw CloneNotSupportedException.


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