// implementer
public class ArrayIntList {
   // fields - data
   // encapsulation
   private int[] elementData;
   private int size;
   
   // constructor 
   public ArrayIntList() {
      elementData = new int[100];
      size = 0;
   }
   
   public void add(int value) {
      elementData[size] = value;
      size++;
   }
   
   public String toString() {
      if (size == 0) {
         return "[]";
      } else {
         String result = "[" + elementData[0];
         // important: this loop is up until size, not elementData.length
         // because we need to maintain the illusion to the client that the 
         // list grows and shrinks
         for (int i = 1; i < size; i++) {
            result += ", " + elementData[i];
         }
         result += "]";
         return result;
      }
    }


}