Thread: How display the first elements and last elements of collection of objects?

For example we have the object created with the class that contain id, name and salary. The objects is posted by the salary and names if the salary is the same. What to do. We could not use indexes in arraylist. New for operator display only the whole set. But i need for example the 5 first element and 3 lasts?

I think most fittable class in this situation is Arraylist. It has the method get(). But it is awkward to show every item. Especially the last ones. The last is possible if it possible to define the size of Array by the same name-size(). But do this method has it? This is very simple in standart array. Maybe transform the arraylist to simple array of objecs but how? For example I create the arraylist by such way Arraylist (<Object>?) workers=new Arqaylist .. Them add by:workers.add(1, "smith", 100)

We could not use indexes in arraylist.

Why not? Have you reviewed the ArrayList API for all that can be done?

Could you show how to do it in this collection Workers. It very simple as it is really to be? I surfed internet and say question about the first and the last one. And the answers were not so evident. Here the task is even comlex.

Or it is very simple with indexes that begins at 0 and ends with i-1. So olny by one: system.out.println(workers.get(1).to sring). Or i am not correctu in displaying it?

I have not code. But you could make a simple tip as a Arraylist has a substrig(index1,index2) method to display or extract appropriate objects in the sequence. I this situation I have question what other collection is applicable to save the objects of such workers class with different types of variables-SET? LinkedList?