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 - Lambda expressions are used primarily to define inline implementation of a functional interface.
Answer : C
Explanation
Both of the above options are correct.
Q 2 - Which of the following functional interface represents a predicate of one double-valued argument?
Answer : B
Explanation
DoublePredicate functional interface represents a predicate (Boolean-valued function) of one double-valued argument.
Q 3 - Which of the following functional interface represents an operation on a single double-valued operand that produces a double-valued result?
Answer : B
Explanation
DoubleUnaryOperator functional interface represents an operation on a single double-valued operand that produces a double-valued result.
Q 4 - Which of the following functional interface represents an operation upon two long-valued operands and produces a long-valued result?
Answer : D
Explanation
LongBinaryOperator functional interface represents an operation upon two long-valued operands and produces a long-valued 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 - 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 is correct about Optional in java8?
B - It is introduced in Java 8 and is similar to what Optional is in Guava.
Answer : C
Explanation
Both of the above options are correct.
Q 8 - Which of the following method of Base64 class returns a Base64.Decoder that decodes using the MIME type base64 decoding scheme?
Answer : C
Explanation
getMimeDecoder() method of Base64 class returns a Base64.Decoder that decodes using the MIME type base64 decoding scheme.
Answer : B
Explanation
Functional interfaces have a single functionality to exhibit.
Answer : B
Explanation
Optional.get method gets the value, value should be present.
