What does the method firstElement() do in java?

The firstElement() method is used to return the first component (the item at index 0) of this vector.

Example

import java.util.Vector;
public class VectorDemo {
   public static void main(String[] args) {

      Vector<Integer> vec = new Vector<Integer>(4);
      vec.add(4);
      vec.add(3);
      vec.add(2);
      vec.add(1);
      System.out.println("First element is :"+vec.firstElement());
   }
}

Output

First element is :4