Java 8 Online Quiz

Q 1 - Which of the following is correct about Java8?

A - Lambda expression - Adds functional processing capability to Java.

B - Method references - Referencing functions by their names instead of invoking them directly. Using functions as parameter.

C - Default method - Interface to have default method implementation.

D - All of the above.

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

A - BooleanSupplier

B - Consumer<T>

C - DoubleBinaryOperator

D - DoubleConsumer

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

A - DoubleToLongFunction

B - DoubleUnaryOperator

C - Function<T,R>

D - IntBinaryOperator

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

A - LongConsumer

B - LongFunction<R>

C - LongPredicate

D - LongSupplier

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>

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.

Q 7 - Which of the following is correct about Nashorn in java8?

A - With Java 8, Nashorn, a much improved javascript engine is introduced, to replace the existing Rhino.

B - Nashorn provides 2 to 10 times better performance, as it directly compiles the code in memory and passes the bytecode to JVM.

C - Nashorn uses invokedynamics feature, introduced in Java 7 to improve performance

D - All of the above.

Q 8 - Which of the following method of Base64 class returns a Base64.Decoder that decodes using the MIME type base64 decoding scheme?

A - getDecoder()

B - getEncoder()

C - getMimeDecoder()

D - getMimeEncoder

Q 9 - Functional interfaces have a single functionality to exhibit.

A - false

B - true

Q 10 - java.util.Date is not thread safe, thus developers have to deal with concurrency issue while using date.

A - true

B - false