/**
 * Generics are not covariant in Java
 * Another example of the problems that covariant generics
 * could cause were it allowed
 * 
 * @author  gtowell
 * created July 2022
 */
import java.util.ArrayList;

public class Cov1 {
    public static void main(String[] args) {
        ArrayList<Integer> ali = new ArrayList<>();
        //ArrayList<Number> aln = ali; // will not compile
        //aln.add(Double.valueOf(4.5));

        ArrayList<String>[] alia = new ArrayList<String>[4];
        Object[] oa = alia;
        ArrayList<Integer> alii = new ArrayList<Integer>();
        alii.add(3);
        oa[0] = alii;
        String s = alia[0].get(0);


    }
}