title: Is it possible to add to an empty arrayList at random indexes?
body: <p>For example i want to add the 1 object to the first index, then i want to add a another object to index 5. So i haven't added anything to 2,3,4,5. Is this possible?</p>
  
  <p>The main reason i want to do this is because i have 2 kinds of activities. I want to store the first kind of activity on the list from 1-5 and the second from 6-10. So this way when i ask the user for what kind of activity she is looking for (first type or second type) i will know which part of the array list to start looking at. </p>