Why set <Integer> is sorting added values?

Question

When I start to add value into Set<Integer> I get sorting elements. Please refer to this example:

Set<Integer> generated = new HashSet<Integer>();
generated.add(2);
generated.add(1);
generated.add(0);

Here I get sorting Set [0, 1, 2]. I would like to get value as I add to generated object.

Answer 1

A HashSet does not have a predictable order for elements. Use a LinkedHashSet to preserve insertion order of elements in a set:

Hash table and linked list implementation of the Set interface, with predictable iteration order.

Set<Integer> generated = new LinkedHashSet<Integer>();
generated.add(2);
generated.add(1);
generated.add(0);