Podcast
Questions and Answers
Which of the following statements about casting are true?
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?
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?
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.
Flashcards
Interface Casting
Interface Casting
An interface reference cannot be cast to another interface type.
Class Casting
Class Casting
A class reference cannot be cast to an interface type.
Casting Interface References
Casting Interface References
Interface references can be cast to class types.
Casting Class References
Casting Class References
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Interface reference to Interface type
Interface reference to Interface type
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Casting to superclass
Casting to superclass
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Casting a superclass
Casting a superclass
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Casting to same type
Casting to same type
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Casting Class to Interface
Casting Class to Interface
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Interface to Class
Interface to Class
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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.
