How to Convert List to List<Object>

Answer 1

Pass the List<String> as a parameter to the constructor of a new ArrayList<Object>.

List<Object> objectList = new ArrayList<Object>(stringList);

Any Collection can be passed as an argument to the constructor as long as its type extends the type of the ArrayList, as String extends Object. The constructor takes a Collection, but List is a subinterface of Collection, so you can just use the List<String>.