Java OOP & IO Quiz

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Test your Java OOP and I/O knowledge.

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Renniel Ivan Exclamador

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Java OOP & IO Quiz


Java OOP & IO QuizVersión en línea Test your Java OOP and I/O knowledge. por Renniel Ivan Exclamador 1 1. Which statement is true regarding abstract classes? a No instances can be created from an abstract class. b Abstract classes can only be instantiated by concrete subclasses. c Instances can be created directly from an abstract class. d Abstract classes are implicitly final. 2 2. What characterizes an abstract method? a It has a full method body and uses the abstract keyword. b It must return a value. c It is implicitly public and static. d It ends with a semi-colon instead of a method body and uses the abstract keyword. 3 3. Which statement about interfaces in Java is true? a They can contain concrete methods and private variables. b Every method declared inside an interface is implicitly public and abstract. c They are classes that can be instantiated. d A class can only implement one interface. 4 4. When a non-abstract class implements an interface, what must it do? a It must provide implementations for all methods declared in that interface. b It must declare itself abstract. c It can choose to implement only some methods. d It inherits the interface's variables as non-constant. 5 5. What is the core meaning of Polymorphism in OOP? a The ability of an object to behave or react to a stimulus in different ways. b The ability of a class to inherit from multiple parent classes. c The process of hiding implementation details and showing only functionality. d The concept of creating objects from blueprints (classes). 6 6. Method Overriding is an example of which type of polymorphism? a Structural polymorphism b Runtime polymorphism c Compile-time polymorphism d Static polymorphism 7 7. Which is a rule for Java Method Overriding? a The method in the subclass must have a different name than in the parent class. b The method in the parent class must be declared final. c There must be an IS-A relationship (inheritance). d The method in the subclass must have different parameters than in the parent class. 8 8. How can methods be overloaded in Java? a By changing the number of parameters, the data type of parameters, or the sequence of data type of parameters. b By changing the return type of the method. c By using the override keyword. d By changing the access modifier of the method. 9 9. What is the effect of declaring a method with the final keyword? a It makes the method static. b It can only be called from within the same class. c It cannot be overridden by subclasses. d It must be overridden by subclasses. 10 10. What is a stream in Java I/O? a A special type of array for storing large amounts of data. b A network connection for data transfer. c A sequence of data. d A method for encrypting file contents. 11 11. Which class is used for reading streams of characters from a text file? a ObjectInputStream b FileInputStream c FileReader d DataInputStream 12 12. To write formatted representations of objects to a text-output stream, which class is used? a FileWriter b ObjectOutputStream c DataOutputStream d PrintWriter 13 13. How are the contents of binary files stored? a In a human-readable text format. b In the same binary format as they are stored in the main memory. c Encrypted for security purposes. d In ASCII format. 14 14. Which stream writes primitive Java data types to an output stream portably? a DataOutputStream b FileWriter c PrintWriter d FileOutputStream 15 15. What must be done to a class to store its objects to a file using Object I/O? a It must extend the File class. b It must implement the Serializable interface. c It must have a default constructor. d It must implement the Cloneable interface. 16 16. Which class is used to serialize Java objects and write them to an OutputStream? a ObjectOutputStream b DataOutputStream c PrintWriter d FileOutputStream 17 17. What does the File class in java.io represent? a A stream for reading binary data. b The actual content of a file. c An abstract representation of file and directory pathnames. d A utility for network communication. 18 18. The Files API in Java NIO is mainly used for what? a Manipulating files and directories. b Creating graphical user interfaces. c Handling network sockets. d Executing database queries. 19 19. Which statement is true about abstract classes and constructors? a They cannot have constructors. b Abstract classes can have constructors that are called by subclasses. c Constructors are not inherited. d They must have a default constructor. 20 20. Which File method checks if a path exists? a exists() b getPath() c length() d isFile()

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Java OOP & IO Quiz

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Java OOP & IO QuizVersión en línea

por Renniel Ivan Exclamador

1. Which statement is true regarding abstract classes?

2. What characterizes an abstract method?

3. Which statement about interfaces in Java is true?

4. When a non-abstract class implements an interface, what must it do?

5. What is the core meaning of Polymorphism in OOP?

6. Method Overriding is an example of which type of polymorphism?

7. Which is a rule for Java Method Overriding?

8. How can methods be overloaded in Java?

9. What is the effect of declaring a method with the final keyword?

10. What is a stream in Java I/O?

11. Which class is used for reading streams of characters from a text file?

12. To write formatted representations of objects to a text-output stream, which class is used?

13. How are the contents of binary files stored?

14. Which stream writes primitive Java data types to an output stream portably?

15. What must be done to a class to store its objects to a file using Object I/O?

16. Which class is used to serialize Java objects and write them to an OutputStream?

17. What does the File class in java.io represent?

18. The Files API in Java NIO is mainly used for what?

19. Which statement is true about abstract classes and constructors?

20. Which File method checks if a path exists?