Lists getting cleared unexpectedly after assignment [duplicate]

Answer 1

Since you are passing a reference instead of the list itself, you will get 0 after clearing your list.

What you have to do is passing to the class a new List containing the other list's values:

cl c = new cl(new List(a)); 

This way, even if you clear the 'main' list, in your class you'll have 1 as items count.

Hope this helps.