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 no result?
Answer : A
Explanation
BiConsumer<T,U> functional interface represents an operation that accepts two input arguments, and returns no result.
Q 2 - Which of the following functional interface represents a supplier of double-valued results?
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 one argument and produces a result?
Answer : C
Explanation
Function<T,R> functional interface represents a function that accepts one argument and produces a result.
Q 4 - Which of the following functional interface represents a predicate (Boolean-valued function) of one long-valued argument?
Answer : C
Explanation
LongPredicate functional interface represents a predicate (Boolean-valued function) of one long-valued argument.
Q 5 - Which of the following functional interface represents a function that accepts two arguments and produces an int-valued result?
Answer : C
Explanation
ToIntBiFunction<T,U> functional interface represents a function that accepts two arguments and produces an int-valued result.
Q 6 - How will you call a static method of an interface in a class?
A - Using super keyword along with interface name.
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?
Answer : B
Explanation
Zoned − Specialized date-time API to deal with various timezones.
Q 8 - Which of the following is the correct lambda expression which add two numbers and return their sum?
Answer : C
Explanation
Both of the above options are correct.
Answer : A
Explanation
Stream takes Collections, Arrays, or I/O resources as input source.
Answer : B
Explanation
Optional.get method gets the value, value should be present.
