Given a list of strings representing numbers, which code snippet correctly converts them to a list of Integer objects using wrapper methods?

hard📝 Application Q8 of 15

Java - Wrapper Classes

List strNums = List.of("1", "2", "3");
// Fill in the blank
List intNums = strNums.stream()._____.collect(Collectors.toList());

Amap(String::valueOf)

BmapToInt(Integer::parseInt)

Cmap(Integer::valueOf)

Dmap(Double::valueOf)

Step-by-Step Solution

Solution:

Step 1: Understand conversion from String to Integer object
Integer.valueOf converts String to Integer object, suitable for mapping.
Step 2: Check other options
Integer.parseInt returns int primitive, not Integer object. String.valueOf returns String. Double.valueOf returns Double object, not Integer.
Final Answer:
map(Integer::valueOf) -> Option C
Quick Check:
Use Integer.valueOf for String to Integer object mapping [OK]

Quick Trick: Use Integer.valueOf in streams to get Integer objects [OK]

Common Mistakes:

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