Main.java

import java.util.ArrayList;
import java.util.List;

/**
 * Main
 */
public class Main {
  public static void main(String[] args) {
    Class<Number> strClz = N2umber.class;
    Class<Integer> intClz = Integer.class;

    List<Integer> intList = new ArrayList<>();
    List<? extends Number> numList = new ArrayList<>();
    
    System.out.println(intList.getClass() == numList.getClass());
    numList = intList;
    
  } 
}



/*
  List<Integer> intList = new ArrayList<Integer>();
    // List<Number> numList = intList;
    List<? extends Number> numList = intList;  // error
 */