Answer
? extends T: Accepts T or subclasses.
? super T: Accepts T or superclasses.
Used for flexible yet safe type handling.
? super T: Accepts T or superclasses.
Used for flexible yet safe type handling.
Quick Answer
Wildcards represent unknown types in generics. ? (unbounded): accepts any type - useful for reading. ? extends T (upper bounded): accepts T or subtypes - can read as T, can't write. ? super T (lower bounded): accepts T or supertypes - can write T, reading gives Object. Remember PECS: Producer Extends (read-only), Consumer Super (write-only).
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.
Want to bookmark, take notes, or join discussions?
Sign in to access all features and personalize your learning experience.
Source: SugharaIQ