Which statement is true about abstract classes and interfaces in Java?
Answer options
A
An abstract class can have constructors; an interface cannot
B
An interface can have instance variables
C
A class can extend multiple abstract classes
D
An abstract class cannot have concrete methods
Correct answer: An abstract class can have constructors; an interface cannot
Detailed Solution & Conceptual Analysis
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Key Engineering Takeaway
In Java Programming, understanding the underlying mechanics of Java is critical for writing performant, bug-free production code and passing rigorous technical architecture reviews.