Java 8 Essentials Quiz

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Test your Java 8 knowledge with quick questions.

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Jeni Alex

India

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Java 8 Essentials Quiz


Java 8 Essentials QuizVersion en ligne Test your Java 8 knowledge with quick questions. par Jeni Alex 1 Which feature introduced in Java 8 enables functional programming style? a Generics b Inheritance c Enums d Lambda expressions 2 Which functional interface represents a function that takes T and returns R? a Function b Supplier c Predicate d Consumer 3 Which syntax is used for method references in Java 8? a ClassName.methodName() b ClassName->method c ClassName.new() d ClassName::methodName 4 Which package was introduced in Java 8 for date/time APIs? a java.calendar b java.time c java.util.Date d java.time2 5 What is a key benefit of default methods in interfaces? a Increase performance b Remove interfaces c Enable multiple inheritance of behavior d Eliminate generics 6 Which OOP concept lets a superclass reference refer to subclass objects? a Abstraction b Inheritance c Encapsulation d Polymorphism 7 Which principle hides internal state and requires access via methods? a Encapsulation b Polymorphism c Inheritance d Abstraction 8 Which collection allows dynamic size and ordered elements? a ArrayList b LinkedHashSet c TreeMap d HashSet 9 Which method must be overridden to define a thread's work? a sleep() b start() c stop() d run() 10 What annotation marks a functional interface? a @Override b @Interface c @Functional d @FunctionalInterface 11 What syntax creates a lambda expression in Java? a param -> expression b new c class d () 12 Which collection preserves insertion order and allows duplicates? a HashSet b TreeSet c HashMap d ArrayList 13 Which term describes executing multiple threads at the same time? a Serial execution b Concurrency c Mutual exclusion d Synchronization 14 Which access modifier makes a member visible only within its class? a private b default c public d protected 15 Which method signature matches Runnable's single abstract method? a void run() b int run() c void stop() d void start()

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Java 8 Essentials Quiz

Test

À propos de cette activité

Créé par

Téléchargez la version pour jouer sur papier

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Java 8 Essentials QuizVersion en ligne

par Jeni Alex

Which feature introduced in Java 8 enables functional programming style?

Which functional interface represents a function that takes T and returns R?

Which syntax is used for method references in Java 8?

Which package was introduced in Java 8 for date/time APIs?

What is a key benefit of default methods in interfaces?

Which OOP concept lets a superclass reference refer to subclass objects?

Which principle hides internal state and requires access via methods?

Which collection allows dynamic size and ordered elements?

Which method must be overridden to define a thread's work?

What annotation marks a functional interface?

What syntax creates a lambda expression in Java?

Which collection preserves insertion order and allows duplicates?

Which term describes executing multiple threads at the same time?

Which access modifier makes a member visible only within its class?

Which method signature matches Runnable's single abstract method?