Pass class type as parameter to use in ArrayList?

Question

I need to write a java method which takes a class (not an object) and then creates an ArrayList with that class as the element of each member in the array. Pseudo-code exam

Answer 1

Vlad Bochenin gives a good way but it makes no sense to provide a T generic that derives from nothing in your method.
It puts zero constraints in the code of insertData() that manipulates the list.
You will be forced to do cast in the code and it defeats the purpose of Generics.

I suppose you want manipulate some instances of known classes in insertData().
And if you use generic in your case, it would have more meaningful if you have subtypes of classes to manipulate.

In this way, you could have a method that accepts a base type and its subclases.

public static  void insertData(Class clazz, String fileName) {
    List newList = new ArrayList<>();
    T t = newList.get(0);
    // here I can manipulate something that derives from YourClass
}