Convert Vector to ArrayList in Java

Last Updated : 08 Sep, 2022

There are multiple ways to convert vector to ArrayList, using passing the Vector in ArrayList constructor and by using simple vector traversal and adding values to ArrayList.

Approach 1:

Create a Vector.
Add some values in Vector.
Create a new ArrayList.
Traverse vector from the left side to the right side.
Start adding each element in ArrayList.

Below is the implementation of the above approach:

Java

// Convert Vector to ArrayList in Java import java.util.Vector; import java.util.ArrayList;  public class GFG {      public static void main(String[] args)     {          // Create a Vector that contain strings          Vector<String> v = new Vector<String>();          // add values in vector          v.add("a");         v.add("b");         v.add("c");         v.add("d");         v.add("e");          // Display the Vector          System.out.println(" Vector :  " + v);          ArrayList<String> Arrlist = new ArrayList<String>();          // Convert Vector to ArrayList         for (int i = 0; i < v.size(); i++)             Arrlist.add(v.get(i));         // Display ArrayList         System.out.println("\n ArrayList : " + Arrlist);     } }

Time Complexity: O(n)

Approach 2:

Create a Vector.
Add some values in Vector.
Create an ArrayList and pass the Vector in ArrayList Constructor.

Syntax:

ArrayList<String> ArrList = new ArrayList<String>(vector);

Below is the implementation of the above approach:

Java

// Convert Vector to ArrayList in Java import java.util.Vector; import java.util.ArrayList;  public class GFG {      public static void main(String[] args)     {          // Create a Vector that contain strings          Vector<String> v = new Vector<String>();          // add values in vector          v.add("a");         v.add("b");         v.add("c");         v.add("d");         v.add("e");          // Display the Vector          System.out.println(" Vector :  " + v);          // Convert Vector to ArrayList         ArrayList<String> Arrlist             = new ArrayList<String>(v);          // Display ArrayList         System.out.println("\n ArrayList : " + Arrlist);     } }

Output

 Vector :  [a, b, c, d, e]   ArrayList : [a, b, c, d, e]

Time Complexity: O(n)

Approach 3 : Using addAll()

Declare and Initialize the Vector object with values.
Now, declare the ArrayList.
By using addAll() method, we can simply add all elements from Vector to ArrayList. Declare the vector object in the addAll() method i.e ArrayList_object.addAll(Vector_object).
Print the ArrayList.

Java

// Java Program to Convert Vector to ArrayList  import java.util.ArrayList; import java.util.Vector;  public class GFG {      public static void main(String[] args)     {         // Create a Vector that contain strings         Vector<String> v = new Vector<String>();          // add values in vector          v.add("a");         v.add("b");         v.add("c");         v.add("d");         v.add("e");          // Display the Vector         System.out.println(" Vector :  " + v);          // Converting vector to ArrayList         ArrayList<String> Arrlist = new ArrayList<String>();         Arrlist.addAll(v);          // Displaying the above ArrayList         System.out.println("\n ArrayList : " + Arrlist);     } }

Output

 Vector :  [a, b, c, d, e]   ArrayList : [a, b, c, d, e]

Convert Vector to ArrayList in Java

mukulsomukesh

Improve

Article Tags :

Practice Tags :

Convert Vector to ArrayList in Java

Similar Reads