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Java Useful Resources
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 - New compiler tools and utilities are added like 'jdeps' to figure out dependencies.
B - New stream API to facilitate pipeline processing is added.
Answer : D
Explanation
All of the above options are correct.
Q 2 - Which of the following functional interface represents a supplier of double-valued results?
Answer : C
Explanation
DoubleSupplier functional interface represents a supplier of double-valued results.
Q 3 - Which of the following functional interface represents a supplier of int-valued results?
Answer : D
Explanation
IntPredicate functional interface represents a supplier of int-valued results.
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 a long-valued argument, and returns no result?
Answer : B
Explanation
ObjLongConsumer<T> functional interface represents an operation that accepts an object-valued and a long-valued argument, and returns no 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 a decoder for decoding byte data using the Base64 encoding scheme in Java8?
Answer : A
Explanation
static class Base64.Decoder - This class implements a decoder for decoding byte data using the Base64 encoding scheme as specified in RFC 4648 and RFC 2045.
Q 8 - Which of the following is the correct lambda expression which add two numbers and return their sum?
A - (int a, int b) -> { return a + b;};
Answer : C
Explanation
Both of the above options are correct.
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.
Answer : A
Explanation
Optional.ofNullable method allows passed parameter to be null.