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Java APIs & Frameworks
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 Java 8 method references?
A - Method references help to point to methods by their names.
B - A method reference is described using :: (double colon) symbol.
Answer : C
Explanation
Both of the above options are correct.
Q 2 - Which of the following functional interface represents a supplier of Boolean-valued results?
Answer : A
Explanation
BooleanSupplier functional interface represents a supplier of Boolean-valued results.
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 on a single long-valued operand that produces a long-valued result?
Answer : C
Explanation
LongUnaryOperator functional interface represents an operation on a single long-valued operand that produces a long-valued result.
Q 5 - Which of the following functional interface represents a function that accepts two arguments and produces a long-valued result?
Answer : A
Explanation
ToLongBiFunction<T,U> functional interface represents a function that accepts two arguments and produces a long-valued result.
Q 6 - What is the purpose of limit 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 'limit' method is used to reduce the size of the stream.
Answer : A
Explanation
Yes! Using ScriptEngineManager, JavaScript code can be called and interpreted in Java.
Q 8 - Which of the following method of Base64 class returns a Base64.Decoder that decodes using the URL and Filename safe type base64 encoding scheme?
Answer : A
Explanation
getUrlDecoder() method of Base64 class returns a Base64.Decoder that decodes using the URL and Filename safe type base64 encoding scheme.
Q 9 - Stream operations do the iterations internally over the source elements provided.
Answer : B
Explanation
Stream operations do the iterations internally over the source elements provided, in contrast to Collections where explicit iteration is required.
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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