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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 System.out::println expression?
Answer : A
Explanation
System.out::println method is a static method reference to println method of out object of System class.
Q 2 - Which of the following functional interface represents a predicate (Boolean-valued function) of two arguments?
Answer : D
Explanation
BiPredicate<T,U> functional interface represents a predicate (Boolean-valued function) of two arguments.
Q 3 - Which of the following functional interface represents an operation that accepts a single int-valued argument and returns no result?
Answer : A
Explanation
IntConsumer functional interface represents an operation that accepts a single int-valued argument and returns no 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 an operation that accepts an object-valued and an int-valued argument, and returns no result?
Answer : A
Explanation
ObjIntConsumer<T> functional interface represents an operation that accepts an object-valued and an int-valued argument, and returns no result.
Q 6 - Which of the following is correct about default methods?
A - With java 8, an interface can have default implementation of a function in interfaces.
B - An interface can also have static helper methods from Java 8 onwards.
Answer : C
Explanation
Both of the above options are correct.
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 Basic type base64 encoding scheme?
Answer : B
Explanation
getEncoder() method of Base64 class returns a Base64.Encoder that encodes using the Basic type base64 encoding scheme.
Q 9 - Stream supports aggregate operations like filter, map, limit, reduce, find and match.
Answer : B
Explanation
Stream supports aggregate operations like filter, map, limit, reduce, find, match, and so on.
Answer : A
Explanation
Optional.ofNullable method allows passed parameter to be null.