Java - Wrapper Classes
You want to store a list of integers that may include null values to represent missing data. Which type should you use in Java?
You want to store a list of integers that may include null values to represent missing data. Which type should you use in Java?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand nullability in collections
Primitive types like int or double cannot hold null, but wrapper classes can.Step 2: Choose correct wrapper type
Integer is the wrapper for int and can hold null; Listsupports null values. Final Answer:
List-> Option B Quick Check:
Use wrapper types in collections to allow nulls = A [OK]
Quick Trick: Use wrapper classes in collections to allow null values [OK]
Common Mistakes:
- Using primitive types in generics
- Choosing wrong wrapper type
- Assuming primitives can be null
Master "Wrapper Classes" in Java
Want More Practice?
15+ quiz questions · All difficulty levels · Free
Free Signup - Practice All QuestionsMore Java Quizzes