Given: ``java List<String> list = ...; list.forEach(x -> { System.out.println(x); }); `` What is the type of x?

Question

List<String> list = ...;
list.forEach(x -> { System.out.println(x); });

Options

• Achar
• BList<Character>
• CString
• DList<String>

• A
  9% (2)
• B
  4% (1)
• C
  78% (18)
• D
  9% (2)

Explanation

x is inferred as String because forEach on a List<String> accepts a Consumer<String>, so the lambda parameter automatically takes the element type of the list - String in this case. Option A (char) is wrong because Java generics work with objects, not primitives, and char is neither the element type nor a valid generic type argument. Option B (List<Character>) confuses the container with the element - forEach iterates over the list, giving you each element, not another list. Option D (List<String>) makes the same mistake at a higher level: the variable list is a List<String>, but x is a single element pulled out of it during iteration. Memory tip: The lambda parameter in forEach always mirrors the generic type parameter of the collection - List<T> → x is T.

No community discussion yet for this question.