Java MCQs with answers Page - 24

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Q. Which of the following will cause a semantic error, if you are trying to compare x to 5?

  • (A) if (x == 5)
  • (B) if (x = 5)
  • (C) if (x <= 5)
  • (D) if (x >= 5)

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Q. How many constructors does the class Exception have?

  • (A) 0
  • (B) 1
  • (C) 2
  • (D) 3

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Q. If class Dog has a subclass Retriever, which of the following is true?

  • (A) Because of single inheritance, Dog can have no other subclasses.
  • (B) Because of single inheritance, Retriever can extend no other class except Dog.
  • (C) The relationship between these classes implies that Dog “is-a” Retriever.
  • (D) The relationship between these classes implies that Retriever “has-a” Dog.

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Q. If there are three classes: Shape, Circle, and Square, what is the most likely relationship between them?

  • (A) Square is a superclass, and Shape and Circle are subclasses of Square.
  • (B) Shape is a superclass, and Circle and Square are subclasses of Shape.
  • (C) Shape, Circle, and Square are all sibling classes.
  • (D) These three classes cannot be related.

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Q. What is byte code in the context of Java?

  • (A) The type of code generated by a Java compiler
  • (B) The type of code generated by a Java Virtual Machine
  • (C) It is another name for a Java source file
  • (D) It is the code written within the instance methods of a class.

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Q. What is garbage collection in the context of Java?

  • (A) The operating system periodically deletes all of the java files available on the system.
  • (B) Any package imported in a program and not used is automatically deleted.
  • (C) When all references to an object are gone, the memory used by the object is automatically reclaim
  • (D) None of these

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Q. JAR stands for?

  • (A) Java Archive
  • (B) Java Archive Runner
  • (C) Java Application Runner
  • (D) None of the above

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Q. What are the pillars of OOPS concept?

  • (A) Abstraction, Inheritance, Encapsulation, Polymorphism
  • (B) Atomicity, Inheritance, Encapsulation, Polymorphism
  • (C) Abstraction, Inheritance, Polymorphism
  • (D) None of the Above

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Q. What is the default buffer size used by any buffered class?

  • (A) 128 bytes
  • (B) 256 bytes
  • (C) 512 bytes
  • (D) 1024 bytes

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Q. Which class cannot be a subclass in java

  • (A) Abstract class
  • (B) Parent class
  • (C) Final class
  • (D) None of above

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