Java Lambda Expressions MCQ - Multiple Choice Questions And Answers

Q. What is a lambda expression in Java?

A. An anonymous function
B. A named function
C. A static function
D. A function with a return type
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Q. Which functional interface is used to represent a supplier in Java 8?

A. Consumer
B. Function
C. Supplier
D. Predicate
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Q. How are lambda expressions denoted in Java?

A. ->
B. =>
C. <>
D. ::
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Q. Which functional interface is used to represent a function that accepts an input and produces a result in Java 8?

A. Consumer
B. Function
C. Supplier
D. Predicate
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Q. Which functional interface is used to represent a function that takes an argument and returns a boolean value in Java 8?

A. Consumer
B. Function
C. Supplier
D. Predicate
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Q. In the context of Java 8 lambda expressions, what is a target type?

A. The type of the lambda expression
B. The type of the functional interface
C. The type of the argument
D. The return type of the lambda expression
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Q. What is the purpose of the Consumer functional interface in Java 8?

A. To produce results
B. To consume values
C. To filter elements based on a condition
D. To transform values
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Q. Which functional interface is used to represent a function that doesn't take any arguments but produces a result in Java 8?

A. Consumer
B. Supplier
C. Function
D. Runnable
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Q. What is the purpose of the Predicate functional interface in Java 8?

A. To produce results
B. To consume values
C. To filter elements based on a condition
D. To transform values
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Q. Which functional interface is used to represent a consumer that takes two input arguments and returns no result in Java 8?

A. BiConsumer
B. BiFunction
C. BiPredicate
D. Comparator
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Q. What is a Lambda Expression in Java?

A.
An anonymous function that can be passed around
B.
A predefined function in Java libraries
C.
A static method in Java
D.
An abstract class in Java
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Q. Which of the following represents a Lambda Expression in Java?

A.

    (int a, int b) -> a + b
    

B.

    public int add(int a, int b) { return a + b; }
    

C.

    (a, b) => a + b
    

D.

    int sum = (x, y) -> x + y;
    

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Q. How do you declare a lambda expression in Java?

A.

    {int x, int y -> x + y}
    

B.

    (int x, int y) -> { return x + y; }
    

C.

    int sum(int x, int y) { return x + y; }
    

D.

    public int add(int a, int b) { a + b; }
    

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Q. Which functional interface is provided by Java to represent a function that takes two arguments and produces a result?

A.

    Consumer
    

B.

    Supplier
    

C.

    BiFunction
    

D.

    Predicate
    

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Q. What is the operator used in Lambda Expressions to separate parameters from the body?

A.

    ->
    

B.

    ::
    

C.

    -
    

D.

    =>
    

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