Mastering Java: The Ultimate 2025 All-In-One Quiz to Excel in 'Thinking in Java

Question: 1 / 510

Which concept allows a class in Java to be 'upcast' to more than one base type?

Polymorphism

Interfaces

Interfaces in Java allow a class to inherit or extend from more than one base type. Unlike multiple inheritance where a class inherits properties and methods from multiple classes, interfaces only define methods and the class needs to provide an implementation for these methods. Polymorphism refers to the ability of objects to take on different forms and is not directly related to the concept of 'upcasting'. Multiple inheritance is not allowed in Java as it can lead to conflicts and confusion. Composition refers to the ability of a class to contain objects of other classes, but it does not allow the class to inherit from multiple base types. Therefore, B is the correct choice.

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Multiple Inheritance

Composition

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