Difference between ArrayList and Vector in Java
One of the most typical questions you will be asked in a Java Developer interview is "What is the difference between ArrayList and vector?" These two are incredibly similar, and as a beginner developer, you may not be able to tell them apart. This page explains the differences between the two
Java uses both ArrayList and vectors to implement List interfaces and maintain insertion order. However, there are several differences between the two. Below are four of the most prominent.
4 Differences between ArrayList and vector
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Synchronisation: Vectors are synchronised, but ArrayList is not
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Speed: Vectors are slower than ArrayLists because they are less synchronised, while ArrayLists are faster because they are non-synchronized
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Iteration: Iteration in ArrayLists is achieved using the Iterator interface, whereas traversal in Lists is achieved by using the List interface.
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Size: A vector increments 100% of its size when an element is added beyond its capacity, while an ArrayList increments 50% of its size if an element is added beyond its capacity.
Example of an ArrayList
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import java.util.ArrayList; import java.util.Iterator; public class Arraylistszz { public static void main(String[] args) { ArrayList<String> ourArrayList = new ArrayList<String>(); ourArrayList.add("Java"); ourArrayList.add("Python"); ourArrayList.add("C++"); ourArrayList.add("PHP"); System.out.println("Our ArrayList Elements Include:"); Iterator myiterator = ourArrayList.iterator(); while (myiterator.hasNext()) System.out.println(myiterator.next()); } } |
Output:
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Our ArrayList Elements Include: Java Python C++ PHP |
Example of a Vector
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import java.util.Enumeration; import java.util.Vector; public class JavaSample { public static void main(String[] args) { Vector<String> vectali = new Vector<String>(); vectali.addElement("Python"); vectali.addElement("Java"); vectali.addElement("Kotlin"); System.out.println("\n We have added the following items in our vector:"); Enumeration enumeli = vectali.elements(); while (enumeli.hasMoreElements()) System.out.println(enumeli.nextElement()); } } |
Output
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We have added the following items in our vector: Python Java Kotlin |