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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 functional interface represents an operation that accepts two input arguments, and returns a result?
Answer : B
Explanation
BiFunction<T,U> functional interface represents an operation that accepts two input arguments, and returns a result.
Q 2 - Which of the following functional interface represents an operation that accepts a single double-valued argument and returns no result?
Answer : D
Explanation
DoubleConsumer functional interface represents an operation that accepts a single double-valued argument and returns no result.
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 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 - 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 simplified date-time API with no complexity of timezone handling in java8?
Answer : A
Explanation
Local − Simplified date-time API with no complexity of timezone handling.
Q 8 - Which of the following method of Base64 class returns a Base64.Decoder that decodes using the Basic type base64 encoding scheme?
Answer : A
Explanation
getDecoder() method of Base64 class returns a Base64.Decoder that decodes using the Basic type base64 encoding scheme.
Answer : A
Explanation
Stream takes Collections, Arrays, or I/O resources as input source.
Q 10 - In which of the following type of Base64 encoding, Output is mapped to a set of characters lying in A-Za-z0-9+/?
Answer : A
Explanation
Simple − Output is mapped to a set of characters lying in A-Za-z0-9+/.
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