How to add an integer element to ArrayList of wildcards in Generics?

Question

I have a ArrayList generic wildcards type, which is taking Number as extends. I am trying to add the integer values to the ArrayList.

Buts it\'s giving me an error

Answer 1

You Should do something like this

ArrayList numberList = new ArrayList();
numberList.add(100);

for java 8, you can use stream(),

// to resolve your read problem cause by  

ArrayList arrayList = new ArrayList();
arrayList.add(100);
List list = arrayList.stream().map(e->(Integer) e).collect(Collectors.toList());
System.out.println(list);