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 Boolean-valued results?
Answer : A
Explanation
BooleanSupplier functional interface represents a supplier of Boolean-valued results.
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 an operation that accepts an object-valued and a double-valued argument, and returns no result?
Answer : D
Explanation
ObjDoubleConsumer<T> functional interface represents an operation that accepts an object-valued and a double-valued argument, and returns no result.
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 - Which of the following is correct about streams in java8?
A - Stream represents a sequence of objects from a source, which supports aggregate operations.
B - Most of the stream operations return stream itself so that their result can be pipelined.
Answer : C
Explanation
Both of the above options are correct.
Q 7 - Which of the following is correct about Nashorn in java8?
C - Nashorn uses invokedynamics feature, introduced in Java 7 to improve performance
Answer : D
Explanation
All of the above options are correct.
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.
Q 9 - A stream provides a set of elements of specific type in a sequential manner.
Answer : A
Explanation
A stream provides a set of elements of specific type in a sequential manner. A stream gets/computes elements on demand. It never stores the elements.
Answer : B
Explanation
Optional.get method gets the value, value should be present.
