Quiz for Lambda Expressions

Q1: What is a lambda expression in Java?

A. A type of variable B. An anonymous function C. A loop construct D. A new class type

Q2: Which interface type is required for using lambda expressions?

A. Runnable B. Marker interface C. Functional interface D. Serializable interface

Q3: Which annotation is used to mark a functional interface?

A. @Functional B. @SingleMethod C. @FunctionalInterface D. @Lambda

Q4: Which of the following is a valid lambda expression?

A. (a, b) -> a + b B. -> a + b C. (a, b => a + b) D. (a + b) =>

Q5: What is the benefit of using lambda expressions?

A. Slower execution B. More complex code C. Concise and readable code D. No type safety

Q6: Which method can be implemented using a lambda for Runnable?

A. run() B. main() C. start() D. call()

Q7: Can a lambda expression access local variables?

A. No B. Only static variables C. Yes, but they must be final or effectively final D. Only inside static blocks

Q8: Which of these is a built-in functional interface in Java?

A. Consumer B. Thread C. Exception D. Iterator

Q9: Which functional interface accepts two arguments and produces a result?

A. Function B. BiFunction C. Predicate D. Supplier

Q10: What is the return type of a lambda expression?

A. It depends on the context B. Always void C. Always Object D. Always String