Answer
Wrapper classes represent primitive types as objects.
Autoboxing: primitive ? wrapper.
Unboxing: wrapper ? primitive.
Autoboxing: primitive ? wrapper.
Unboxing: wrapper ? primitive.
Quick Answer
Wrapper classes (Integer, Double, Boolean etc.) wrap primitive types as objects so they can be used in collections and generics. Autoboxing: automatic conversion from primitive to wrapper (int to Integer). Unboxing: automatic conversion from wrapper to primitive. Watch out: unboxing a null Integer throws NullPointerException. Autoboxing in loops can create many short-lived objects.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ