Vector add() Method in Java

• boolean add(Object element): This method appends the specified element to the end of this vector.

  Syntax:

  boolean add(Object element)

  Parameters: This function accepts a single parameter element as shown in the above syntax. The element specified by this parameter is appended to end of the vector.

  Return Value: This method returns True after successful execution, else False.

  Below program illustrates the working of java.util.Vector.add(Object element) method:

  Example:

  // Java code to illustrate boolean add(Object element)
  import java.util.*;
  
  public class VectorDemo {
      public static void main(String args[])
      {
  
          // Creating an empty Vector
          Vector<String> vec_tor = new Vector<String>();
  
          // Use add() method to add elements in the vector
          vec_tor.add("Geeks");
          vec_tor.add("for");
          vec_tor.add("Geeks");
          vec_tor.add("10");
          vec_tor.add("20");
  
          // Output the present vector
          System.out.println("The vector is: " + vec_tor);
  
          // Adding new elements to the end
          vec_tor.add("Last");
          vec_tor.add("Element");
  
          // Printing the new vector
          System.out.println("The new Vector is: " + vec_tor);
      }
  }
  Output:

  The vector is: [Geeks, for, Geeks, 10, 20]
  The new Vector is: [Geeks, for, Geeks, 10, 20, Last, Element]
  

• void add(int index, Object element): This method inserts an element at a specified index in the vector. It shifts the element currently at that position (if any) and any subsequent elements to the right (will change their indices by adding one).

  Syntax:

  void add(int index, Object element)

  Parameters: This method accepts two parameters as described below.

  • index: The index at which the specified element is to be inserted.
  • element: The element which is needed to be inserted.

  Return Value: This method does not return any value.

  Exception: The method throws IndexOutOfBoundsException if the specified index is out of range of the size of the vector.

  Below program illustrates the working of java.util.Vector.add(int index, Object element) method:

  Example:

  // Java code to illustrate boolean add(Object element)
  import java.util.*;
  
  public class VectorDemo {
      public static void main(String args[])
      {
  
          // Creating an empty Vector
          Vector<String> vec_tor = new Vector<String>();
  
          // Use add() method to add elements in the vector
          vec_tor.add("Geeks");
          vec_tor.add("for");
          vec_tor.add("Geeks");
          vec_tor.add("10");
          vec_tor.add("20");
  
          // Output the present vector
          System.out.println("The vector is: " + vec_tor);
  
          // Adding new elements to the end
          vec_tor.add(2, "Last");
          vec_tor.add(4, "Element");
  
          // Printing the new vector
          System.out.println("The new Vector is: " + vec_tor);
      }
  }
  Output:

  The vector is: [Geeks, for, Geeks, 10, 20]
  The new Vector is: [Geeks, for, Last, Geeks, Element, 10, 20]