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 an operation upon two operands of the same type, producing a result of the same type as the operands?
Answer : C
Explanation
BinaryOperator<T> functional interface represents an operation upon two operands of the same type, producing a result of the same type as the operands.
Q 3 - Which of the following functional interface represents a function that accepts an int-valued argument and produces a result?
Answer : B
Explanation
IntFunction<R> functional interface represents a function that accepts an int-valued argument and produces a result.
Q 4 - Which of the following functional interface represents a supplier of long-valued results?
Answer : D
Explanation
LongSupplier functional interface represents a supplier of long-valued results.
Q 5 - Which of the following functional interface represents a function that produces an int-valued result?
Answer : D
Explanation
ToIntFunction<T> functional interface represents a function that produces an int-valued result.
Q 6 - Which of the following is correct about streams in java8?
Answer : C
Explanation
Both of the above options are correct.
Q 7 - What is the purpose of sorted method of stream in java 8?
A - Iterate each element of the stream.
B - Map each element to its corresponding result.
Answer : D
Explanation
The 'sorted' method is used to sort the stream.
Q 8 - Using lambda expression, you can refer to final variable or effectively final variable (which is assigned only once).
Answer : B
Explanation
Using lambda expression, you can refer to final variable or effectively final variable (which is assigned only once).
Answer : A
Explanation
Optional is a container object which is used to contain not-null objects.
Q 10 - The new date-time API in java 8 is immutable and does not have setter methods.
Answer : A
Explanation
The new date-time API in java 8 is immutable and does not have setter methods.
