/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		List<List<? extends Number>> list = new ArrayList<>();
		List<List<Integer>> intList = new ArrayList<>();
 
		// Use raw types to subvert type safety...
		// list = intList; isn't otherwise allowed.
		list = (List) intList;
 
		List<Double> doubles = new ArrayList<>(Arrays.asList(0.0));
		list.add(doubles);
 
		for (List<Integer> ints : intList) {
			for (Integer i : ints) {
				System.out.println(i);
			}
		}
	}
}

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