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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 is correct about Java 8 lambda expression?

A - Optional type declaration - No need to declare the type of a parameter. The compiler can inference the same from the value of the parameter.

B - Optional parenthesis around parameter - No need to declare a single parameter in parenthesis. For multiple parameters, parentheses are required.

C - Both of the above.

D - None of the above.

Answer : C

Explanation

Both of the above options are correct.

Q 2 - Which of the following functional interface represents a supplier of double-valued results?

A - DoubleFunction<R>

B - DoublePredicate

C - DoubleSupplier

D - DoubleToIntFunction

Answer : C

Explanation

DoubleSupplier functional interface represents a supplier of double-valued results.

Q 3 - Which of the following functional interface represents a function that accepts an int-valued argument and produces a double-valued result?

A - IntToDoubleFunction

B - IntToLongFunction

C - IntUnaryOperator

D - LongBinaryOperator

Answer : A

Explanation

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

Q 4 - Which of the following functional interface represents a supplier of long-valued results?

Answer : D

Explanation

LongSupplier functional interface represents a supplier of long-valued results.

Q 5 - Which of the following functional interface represents an operation that accepts an object-valued and an int-valued argument, and returns no result?

A - ObjIntConsumer<T>

B - ObjLongConsumer<T>

C - Predicate<T>

D - Supplier<T>

Answer : A

Explanation

ObjIntConsumer<T> functional interface represents an operation that accepts an object-valued and an int-valued argument, and returns no result.

Q 6 - How will you call a default 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 : A

Explanation

Using super keyword along with interface name.

Q 7 - Can you execute javascript code from java 8 code base?

A - true

B - false

Answer : A

Explanation

Yes! Using ScriptEngineManager, JavaScript code can be called and interpreted in Java.

Q 8 - Which of the following method of Base64 class returns a Base64.Encoder that encodes using the URL and Filename safe type base64 encoding scheme?