If you try 

```
    List<Boolean> alist = new ArrayList<Boolean>();

    alist.add(5, true);     

```

You get an error, because you cant add to an index that is not in the list. What do i use in order to be able to write: 

```
any.add(73, true)

if any.get(52) {
  // Do something
}

```

Only if the list has stored something in 73, it will be true, otherwise false.