The List API has eight methods for positional access operations:

• add(T type)
• add(int index, T type)
• remove(Object o)
• remove(int index)
• get(int index)
• set(int index, E element)
• int indexOf(Object o)
• int lastIndexOf(Object o)

So, if we have a List:

List<String> strings = new ArrayList<String>();

And we wanted to add the strings “Hello world!” and “Goodbye world!” to it, we would do it as such:

strings.add("Hello world!");
strings.add("Goodbye world!");

And our list would contain the two elements. Now lets say we wanted to add “Program starting!” at the front of the list. We would do this like this:

strings.add(0, "Program starting!");

NOTE: The first element is 0.

Now, if we wanted to remove the “Goodbye world!” line, we could do it like this:

strings.remove("Goodbye world!");

And if we wanted to remove the first line (which in this case would be “Program starting!”, we could do it like this:

strings.remove(0);