I have implemented a vector class.It's fine except it shows the
element at position 2 i.e. index 1 is 19 even after removing it.But
the size i am able to decrease.What should I do for that? Can anyone
suggest me?My program is:-

import java.io.*;

class VectorEmptyException extends RuntimeException {
     VectorEmptyException(String message) {
     super(message);
 }

}

class Vector<T> {
     Object[] data;
     int count;

  Vector() {
     data = new Object[1];
     count = 0;

}

  Vector(int s) {
     data = new Object[s];
     count = 0;

}

  int size() {return count;}

  Object elementAt(int i) throws VectorEmptyException {
         if(i>=count) throw new VectorEmptyException("Vector is
empty");
         return data[i];
         }

  void add(int index,Object O) {
        if(data.length == count) {
          Object[] newdata = new Object[data.length*2];
        for(int i=0;i<count;i++) {
            newdata[i] = data[i];
          }
         data = newdata;
}

         for(int i=count;i>index;i--) {
            data[i] =data[i-1];
         }
         data[index] = O;
         count++;

}
 Object remove(int index) throws VectorEmptyException{
          if(index >= count) throw new VectorEmptyException("Vector
is empty");
          if (data.length <= count) {
          Object[] newdata = new Object[data.length-1];
             for(int i=0;i<index;i++)
             newdata[i] = data[i];
             for(int i=index;i<count-1;i++)
             newdata[i] = data[i+1];
             data = newdata;}
             count--;
             return data[index];

}
    public static void main(String[] args){
        Vector<Integer> v = new Vector<Integer>();
        try{
         v.add(0,22);v.add(1,19);v.add(2,45)
         System.out.println("The 2nd element is : " +v.elementAt(1));
         System.out.println("The size of the vector is : "
+v.size());

         System.out.println("The removed element is : "
+v.remove(1));
         System.out.println("The 2nd element is : " +v.elementAt(1));

         System.out.println("The size of the vector is : "
+v.size());
         }
         catch(VectorEmptyException e){
         System.out.println("The vector is empty");
         System.out.println(e.getMessage());
        }
  }
}