Vector : add( int index, E element) : Add data at specific index

public void add(int index, E element)

Inserts the specified element at the specified position in this Vector. Shifts the element currently at that position (if any) and any subsequent elements to the right (adds one to their indices).

import java.util.*;
class VectorAddAtIndex{
 public static void main(String args[]){
  Vector<Integer> myVector = new Vector<> ();
  
  /* Add Elements to myVector */
  myVector.add(10);
  myVector.add(20);
  myVector.add(30);
  myVector.add(40);

  System.out.println("Elements in myVector are");
  System.out.println(myVector);
  System.out.println("\nAdd 50 at the front\n");
  myVector.add(0, 50);
  System.out.println("Elements in myVector are");
  System.out.println(myVector);  
 }
}

 

Output

Elements in myVector are
[10, 20, 30, 40]

Add 50 at the front

Elements in myVector are
[50, 10, 20, 30, 40]

1. Throws ArrayIndexOutOfBoundsException if the index is out of range

import java.util.*;
class VectorAddArrayIndexOut{
 public static void main(String args[]){
  Vector<Integer> myVector = new Vector<> ();
  
  /* Add Elements to myVector */
  myVector.add(10);
  myVector.add(20);
  myVector.add(30);
  myVector.add(40);

  System.out.println("Elements in myVector are");
  System.out.println(myVector);
  System.out.println("\nAdd 0 at 50th index\n");
  myVector.add(50, 0);
  System.out.println("Elements in myVector are");
  System.out.println(myVector);  
 }
}

Output

Elements in myVector are
[10, 20, 30, 40]

Add 0 at 50th index

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 50 > 4
        at java.util.Vector.insertElementAt(Vector.java:594)
        at java.util.Vector.add(Vector.java:810)
        at VectorAddArrayIndexOut.main(VectorAddArrayIndexOut.java:15)

 

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