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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 is correct about Java8?
A - Lambda expression - Adds functional processing capability to Java.
C - Default method - Interface to have default method implementation.
Answer : D
Explanation
All of the above options are correct.
Q 2 - Which of the following functional interface represents an operation that accepts a single input argument and returns no result?
Answer : B
Explanation
Consumer<T> functional interface represents an operation that accepts a single input 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 a function that accepts a long-valued argument and produces a double-valued result?
Answer : A
Explanation
LongToDoubleFunction functional interface represents a function that accepts a long-valued argument and produces a double-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 - Which of the following functional interface represents an operation on a single operand that produces a result of the same type as its operand?
Answer : C
Explanation
UnaryOperator<T> functional interface represents an operation on a single operand that produces a result of the same type as its operand.
Q 7 - Which of the following class implements an encoder for encoding byte data using the Base64 encoding scheme in Java8?
Answer : B
Explanation
static class Base64.Encoder - This class implements an encoder for encoding byte data using the Base64 encoding scheme as specified in RFC 4648 and RFC 2045.
Q 8 - Which of the following method of Base64 class returns a Base64.Encoder that encodes using the URL and Filename safe type base64 encoding scheme?
Answer : B
Explanation
getUrlEncoder() method of Base64 class returns a Base64.Encoder that encodes using the URL and Filename safe type base64 encoding scheme.
Q 9 - Most of the stream operations return stream itself so that their result can be pipelined.
Answer : B
Explanation
Most of the stream operations return stream itself so that their result can be pipelined.
Q 10 - In which of the following type of Base64 encoding, Output is mapped to MIME friendly format?
Answer : C
Explanation
MIME − Output is mapped to MIME friendly format. Output is represented in lines of no more than 76 characters each, and uses a carriage return ' ' followed by a linefeed ' ' as the line separator. No line separator is present to the end of the encoded output.
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