Vector class

From:
HelpMe <ShahilAkhtar@gmail.com>
Newsgroups:
comp.lang.java.programmer
Date:
Fri, 7 Mar 2008 20:54:58 -0800 (PST)
Message-ID:
<84bb18e0-a356-49d7-b090-db0125c94a2b@s37g2000prg.googlegroups.com>
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());
         }
   }
}

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