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String a []= {null,null,null,null,null};
//add array to arraylist
ArrayList<Object> choice = new ArrayList<Object>(Arrays.asList(a));
System.out.println(choice.size());
Why the size of the arrayList choice is 5 when all the elements have been set to null
Because the ArrayList still contains 5 Objects. They are null, but they are objects, thus present in the list!
You can empty the ArrayList, by calling
choice.clear();