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What is the purpose of an interface in Java? To provide a concrete implementation of methods. To define a contract for classes to implement. To hide data within a class. To create objects directly.

Ask by Dickson Santiago. in the United States
Mar 12,2025

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An interface in Java defines a contract that classes must follow by implementing its methods.

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The purpose of an interface in Java is: **To define a contract for classes to implement.** An interface specifies a set of methods that a class must implement, but it does not provide concrete implementations of those methods. This allows for a form of abstraction and enables multiple classes to implement the same interface in different ways, promoting polymorphism. The other options are incorrect for the following reasons: - **To provide a concrete implementation of methods:** Interfaces do not provide concrete implementations; they only declare methods. - **To hide data within a class:** Data hiding is achieved through access modifiers (like private) in classes, not through interfaces. - **To create objects directly:** Interfaces cannot be instantiated directly; they must be implemented by classes that provide the concrete behavior.

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An interface in Java serves as a blueprint for classes, defining a contract that specifies what methods a class must implement without providing the actual implementation. This allows different classes to be treated uniformly, fostering polymorphism and enabling easier code management and collaboration across different components in a program. One of the big advantages of using interfaces is the ability to achieve multiple inheritance in a way that doesn't compromise the integrity of the classes involved. While a class can only inherit from one superclass, it can implement multiple interfaces, allowing it to inherit behavior from several sources. This promotes flexibility and reusability in designing your code!

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