Question

Is there a way to use the toArray() method on an ArrayList<CustomObject>?

From what I see, it can only be used with Object

Answer 1

You need to pass in an array of CustomObject in order to get one back. The parameter-free ArrayList.toArray() call returns an Object[], but the parameterized version T[] ArrayList<T>.toArray(T[]) returns what you expect. If you size the array you pass as a parameter correctly then the call will use the array you pass rather than allocate another one, e.g.

ArrayList<CustomObject> foo;
//...
CustomObject[] bar = foo.toArray(new CustomObject[foo.size()]);