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Java Control Statements

Object Oriented Programming

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Advanced Java

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Java 8 Online Quiz

Following quiz provides Multiple Choice Questions (MCQs) related to Java 8. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.

Q 1 - Which of the following functional interface represents an operation that accepts two input arguments, and returns a result?

A - BiConsumer<T,U>

B - BiFunction<T,U,R>

C - BinaryOperator<T>

D - BiPredicate<T,U>

Answer : B

Explanation

BiFunction<T,U> functional interface represents an operation that accepts two input arguments, and returns a result.

Q 2 - Which of the following functional interface represents a function that accepts a double-valued argument and produces an int-valued result?

A - DoubleFunction<R>

B - DoublePredicate

C - DoubleSupplier

D - DoubleToIntFunction

Answer : D

Explanation

DoubleToIntFunction functional interface represents a function that accepts a double-valued argument and produces an int-valued result.

Q 3 - Which of the following functional interface represents a predicate (Boolean-valued function) of one int-valued argument?

Answer : C

Explanation

IntPredicate functional interface represents a predicate (Boolean-valued function) of one int-valued argument.

Q 4 - Which of the following functional interface represents a function that accepts a long-valued argument and produces a result?

Answer : B

Explanation

LongFunction<R> functional interface represents a function that accepts a long-valued argument and produces a result.

Q 5 - Which of the following functional interface represents a predicate (Boolean-valued function) of one argument?

A - ObjIntConsumer<T>

B - ObjLongConsumer<T>

C - Predicate<T>

D - Supplier<T>

Answer : C

Explanation

Predicate<T> functional interface represents a predicate (Boolean-valued function) of one argument.

Q 6 - How will you call a static method of an interface in a class?

A - Using super keyword along with interface name.

B - Using name of the interface.

C - Both of the above.

D - None of the above.

Answer : B

Explanation

Using name of the interface.

Q 7 - Which of the following API represents a specialized date-time API to deal with various timezones in java8?

A - Local

B - Zoned

C - Both of the above.

D - None of the above.

Answer : B

Explanation

Zoned − Specialized date-time API to deal with various timezones.

Q 8 - Using lambda expression, you can refer to final variable or effectively final variable (which is assigned only once).

A - false

B - true

Answer : B

Explanation

Using lambda expression, you can refer to final variable or effectively final variable (which is assigned only once).

Q 9 - Stream takes Collections, Arrays, or I/O resources as input source.

A - true

B - false

Answer : A

Explanation

Stream takes Collections, Arrays, or I/O resources as input source.

Q 10 - The new date-time API in java 8 is immutable and does not have setter methods.

A - true

B - false

Answer : A

Explanation

The new date-time API in java 8 is immutable and does not have setter methods.

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