Which method can be used to check null on an Optional variable in Java 8

Core Java Multiple Choice Questions And Answers

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• Which two statements are reserved words in Java? (Choose Two)
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• You need to store elements in a collection that guarantees that no duplicates are stored and all elements can be accessed in natural order. Which interface provides that capability?
• Which statement is true for the class java.util.HashSet?
• What are the two acceptable types for the variable i? (Choose Two)
• What is the result?
• Which two statements are true? (Choose two)
• Which two statements are true about the hashCode method? (Choose two.)
• Which class does NOT override the equals() and hashCode() methods, inheriting them directly from class Object?
• Which collection class allows you to grow or shrink its size and provides indexed access to its elements, but whose methods are not synchronized?
• You need to store elements in a collection that guarantees that no duplicates are stored and all elements can be accessed in natural order. Which interface provides that capability?
• Lambdas introduced in Java 8 allow us to treat
• The newly introduced Streams API is available in which package of java 8
• Lambda expressions in java 8 are based on
• In Java 8 Interfaces, methods can be:
• Which method can be used to check null on an Optional variable in Java 8
• Which of these does Stream map() operates on
• Java Program to print "Hello World"
• Which gets the name of the parent directory file "file.txt"?

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• Core Java Multiple Choice Questions And Answers

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