Q1
What do wrapper classes do?
AConvert primitives into objects
BConvert objects into primitives only
CDelete primitive types
DNothing specific
ICSEClass 10 (ICSE)Computer ApplicationsCh 2 · Topic 1
Wrapper Classes
Wrapper classes in Java convert primitive data types (like int, double) into objects, enabling their use in contexts requiring objects.
Core concept
Each primitive type has a corresponding wrapper class, like Integer for int, Double for double, and Character for char.
How it works
Autoboxing automatically converts a primitive value to its wrapper object, while unboxing converts a wrapper object back to a primitive.
Why it matters
Wrapper classes provide useful methods, like Integer.parseInt() to convert a String to an int, useful for processing user input.
Key detail
Understanding wrapper classes is important for working with Java collections and other features that require objects rather than primitives.
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• Wrapper classes convert primitives to objects.
• Integer wraps int; Double wraps double; Character wraps char.
• Autoboxing converts primitive to wrapper automatically.
• Unboxing converts wrapper back to primitive.
• Integer.parseInt() converts String to int.
• This is useful for processing user input.
• Wrapper classes are needed for Java collections.
• They bridge primitives and object-based features.