Java Casting Quiz
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Questions and Answers

Which of the following statements about casting are true?

  • A class reference cannot be cast to the interface type.
  • An interface reference provides access to all public methods of the class.
  • Both interface and class references can be cast to either type. (correct)
  • An interface reference cannot be cast to the class type.

    • What is the correct statement about interface casting?

  • An interface reference cannot be cast to the class type.
  • An interface works with the instanceof operator.
  • An interface reference provides access to all public methods of the class.
  • An interface reference cannot be cast to another interface type. (correct)

    • What is true about class casting in Java?

  • An interface reference provides access to all public methods of the class.
  • A class reference cannot be cast to the interface type. (correct)
  • An interface works with the instanceof operator.
  • Both interface and class references can be cast to either type.

    • Study Notes

    Casting in Java

    • Casting is a process of converting one data type into another
    • There are two types: primitive casting and reference casting

    Interface Casting

    • Interface casting allows casting an object to an interface type
    • This is possible because an object may implement multiple interfaces

    Class Casting

    • Class casting allows casting an object to a class type
    • This is possible because an object has a unique class type
    • In Java, you can cast a subclass to its superclass but not vice versa

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    Description

    Test your knowledge of casting in Java with this quiz. Choose the correct statements about casting interface and class references, and see how well you understand the concepts.

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