Vector in Java

The Vector class in Java is a dynamic array implementation that is part of the Java Collections Framework. It provides a resizable array that can grow or shrink as needed. Vectors are similar to ArrayLists but are synchronized, making them thread-safe for use in multi-threaded environments.

Declaration and Initialization

To use a Vector in Java, you need to import the java.util.Vector package. Here's an example of declaring and initializing a Vector:

    
import java.util.Vector;

public class Example {
    public static void main(String[] args) {
  Vector<String> fruits = new Vector<>();
        // Adding elements to the Vector
        fruits.add("Apple");
        fruits.add("Banana");
        fruits.add("Orange");

        // Accessing elements
        System.out.println("Access Element = "+fruits.get(0)); // Output: Apple

        // Modifying elements
        fruits.set(1, "Mango");

        // Removing elements
        fruits.remove(2);

        // Iterating over elements
        for (String fruit : fruits) {
            System.out.println("Iterating Elements = "+fruit);
        }


    }
}
    
  

Common Vector Operations

Here are some commonly used operations with Vectors:

• add(element): Adds an element to the end of the Vector.
• get(index): Retrieves the element at the specified index.
• set(index, element): Replaces the element at the specified index with a new element.
• remove(index): Removes the element at the specified index.
• size(): Returns the number of elements in the Vector.
• isEmpty(): Checks if the Vector is empty.
• clear(): Removes all elements from the Vector.

In addition to these methods, Vectors also provide synchronization mechanisms like addElement() and removeElement() to ensure thread-safe operations. However, if thread safety is not a requirement, ArrayLists may offer better performance due to their lack of synchronization.