Java Study Group Chapter 1

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| By K_electron
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K_electron
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Quizzes Created: 1 | Total Attempts: 61
| Attempts: 61
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  • 1/5 Questions

    A class can ...

    • Extend only a single class and implement only a single interface
    • Extend only a single class but implement multiple interfaces
    • Extend multiple classes but implement only a single interface
    • Extend multiple classes and implement multiple interfaces
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About This Quiz

Explore key Java concepts in this 'Java study group chapter 1' quiz. Dive into understanding the correct syntax order, class inheritance, Java keywords, and method implementations. Ideal for learners aiming to enhance their Java programming skills.

Java Study Group Chapter 1 - Quiz

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  • 2. 
    Given the following classes defined in separate files:What will the output be on running the Test class? - ProProfs

    Given the following classes defined in separate files:What will the output be on running the Test class?

    • Compiler error for statement v=c

    • Prints: -Vehicle:Driving--Car:Driving--Vehicle:Driving-

    • Runtime exception for statement v=c

    • Prints: -Vehicle:Driving--Car:Driving--Car:Driving-

    • Prints: -Vehicle:Driving--Car:Driving-

    Correct Answer
    A. Prints: -Vehicle:Driving--Car:Driving--Car:Driving-
    Explanation
    The output will be "Prints: -Vehicle:Driving--Car:Driving--Car:Driving-". This is because the statement "v=c" assigns the object of the Car class to the reference variable v of the Vehicle class. Since the Car class is a subclass of the Vehicle class, it inherits the drive() method from the Vehicle class. Therefore, when the drive() method is called on the object v, it executes the drive() method of the Car class. The output is printed three times because the drive() method is called three times in the Test class.

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  • 3. 

    What is the correct order?

    • Import, package, class

    • Class, import, package

    • Package, import, class

    • Package, class, import

    • Import, class, package

    Correct Answer
    A. Package, import, class
    Explanation
    The correct order is package, import, class. In Java, the package statement is used to define the package that the class belongs to. The import statement is used to import other classes or packages that are needed in the current class. Finally, the class statement is used to define the class itself. Therefore, the correct order is to first define the package, then import any necessary classes or packages, and finally define the class.

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  • 4. 

    Which of the following are Java keywords?

    • Goto

    • Malloc

    • Implementable

    • Extends

    • New

    • Delete

    Correct Answer(s)
    A. Goto
    A. Extends
    A. New
  • 5. 

    Which are true?

    • Abstract interfaces can have final methods.

    • The first concrete subclass must implement all abstract methods of its superclass.

    • Abstract classes cannot have static methods.

    • Interfaces can declare instance variables.

    • A protected method in a superclass that is inherited by a subclass in a different package is now available to all classes in the subclass's package.

    Correct Answer(s)
    A. The first concrete subclass must implement all abstract methods of its superclass.
    A. Abstract classes cannot have static methods.
    Explanation
    The first statement is true. When a class extends an abstract class, it must provide implementations for all the abstract methods defined in the superclass.

    The second statement is also true. Abstract classes cannot have static methods because static methods are associated with the class itself, not with any particular instance of the class.

    Therefore, the correct answer is that the first concrete subclass must implement all abstract methods of its superclass and abstract classes cannot have static methods.

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  • Current Version
  • Jun 05, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Sep 26, 2010
    Quiz Created by
    K_electron
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