Convert Vector to ArrayList in Java
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 Javaimport 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 Javaimport 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 ArrayListimport 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]
