Java Lambda Expression MCQs with answers Page - 8

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Q. What is the syntax to implement a `Runnable` using a lambda?

  • (A) () -> System.out.println("Run")
  • (B) (String s) -> System.out.println(s)
  • (C) x -> System.out.println(x)
  • (D) (int x, int y) -> x + y

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Q. Which lambda expression can be used to check if a string is empty?

  • (A) s -> s.isEmpty()
  • (B) () -> isEmpty()
  • (C) s => s.empty()
  • (D) s -> s.size() == 0

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Q. Lambda expressions were primarily introduced to support which Java feature?

  • (A) Object-oriented programming
  • (B) Generic programming
  • (C) Functional programming
  • (D) Procedural programming

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Q. What will `() -> System.out.println("Hi")` produce?

  • (A) A Predicate
  • (B) A Runnable
  • (C) A Supplier
  • (D) A Consumer

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Q. What kind of interface is necessary for a lambda to be used?

  • (A) Interface with static methods only
  • (B) Functional interface with one abstract method
  • (C) Any abstract class
  • (D) Any interface

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Q. Can lambda expressions implement default methods in interfaces?

  • (A) Yes
  • (B) No
  • (C) Only in abstract classes
  • (D) Only static methods

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Q. What will be the output of `(x, y) -> x * y` for inputs 3 and 4?

  • (A) 7
  • (B) 12
  • (C) 1
  • (D) 0

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Q. Which functional interface should be used to replace a for-each loop with a lambda?

  • (A) Function
  • (B) Predicate
  • (C) Consumer
  • (D) Supplier

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Q. In which Java version were method references introduced along with lambdas?

  • (A) Java 6
  • (B) Java 7
  • (C) Java 8
  • (D) Java 9

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