iterate over a Hashset

Question

Hello....!! could some one check the link below and explain this to me I do not understand why the input is
/ **popularLanguages.add("java") ;
popularLanguages.add("c++") ;
popularLanguages.add("c# ") ;
popularLanguages.add("c") ;
popularLanguages.add("kotlin") **/ and the output is
c# python
java java
c++ instead of c++ as a simple array
c c#
Kotlin c
python kotlim
https://code.sololearn.com/csBVE3T2yGhK/?ref=app
and how to get the same order in output as in imput when using a Set table

Answer 1

You can use LinkedHashSet to maintain elements in insertion order.
You can use TreeSet to maintain the elements in sorted order.

Answer 2

i don't master my question well but the problem was about how to maintain insertion order when using a set and as you say on top i have use a LinkedHashSet and it work thans to all you

Answer 3

String popularLanguage = popularLanguageIterator.next() ;
// You can remove the above line and use the below to get the same result.
System.out.println(popularLanguageIterator.next());
Also if you want to display it as an array or a list then you can do-
System.out.println(popularLanguages.toString());
Edit: I don't think if I understood the question well but these may be a couple tricks you can use to make things easier.