Question

I am learning generics.

I tried below code:

For HashSet

Set<Object> setOfAnyType = new HashSet<Object>();
setOfAnyType.add(1);
setOfAnyType.add("abc"); 

But When I try same thing in ArrayList of type Object and try to insert integer and String it gives me compile time error why?.Please guide.

    List<Object> superArray=new ArrayList<Object>();
    superArray.put(1);
    superArray.put("abc");

Answer 1

The method put is undefined for List, you can use:

superArray.add(1);
superArray.add("Sakina");