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Add an element at specified index of Java Vector Example

  1. /*
  2.   Add an element to specified index of Java Vector Example
  3.   This Java Example shows how to add an element at specified index of java
  4.   Vector object using add method.
  5. */
  6.  
  7. import java.util.Vector;
  8.  
  9. public class AddElementToSpecifiedIndexVectorExample {
  10.  
  11.   public static void main(String[] args) {
  12.     //create an Vector object
  13.     Vector v = new Vector();
  14.    
  15.     //Add elements to Vector
  16.     v.add("1");
  17.     v.add("2");
  18.     v.add("3");
  19.    
  20.     /*
  21.       To add an element at the specified index of Vector use
  22.       void add(int index, Object obj) method.
  23.       This method inserts the specified element at the specified index in the
  24.       Vector.  
  25.     */
  26.     v.add(1,"INSERTED ELEMENT");
  27.    
  28.     /*
  29.       Please note that add method DOES NOT overwrites the element previously
  30.       at the specified index in the Vector. It shifts the elements to right side
  31.       and increasing the Vector size by 1.
  32.     */
  33.  
  34.     System.out.println("Vector contains...");
  35.     //display elements of Vector
  36.     for(int index=0; index < v.size(); index++)
  37.       System.out.println(v.get(index));
  38.    
  39.     /*
  40.        To append an element at the end of Vector use
  41.        boolean add(Object o) method.
  42.        It returns true as a general behavior of the Collection.add method and
  43.        appends the specified element at the end of Vector.
  44.     */
  45.   }
  46. }
  47.  
  48. /*
  49. Vector contains...
  50. 1
  51. INSERTED ELEMENT
  52. 2
  53. 3
  54. */