How many interfaces can a class implement?

A class can implement more than one interface at a time. A class can extend only one class, but implement many interfaces. An interface can extend another interface, in a similar way as a class can extend another class.
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What is the maximum number of interfaces a class can implement?

But if you really really want to know the theoretical maximum number of interfaces a class can implement, it's 65535.
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Can a class implement multiple interfaces?

Your class can implement more than one interface, so the implements keyword is followed by a comma-separated list of the interfaces implemented by the class. By convention, the implements clause follows the extends clause, if there is one.
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How many interfaces can a class inherit?

A class or struct can implement multiple interfaces. A class can inherit a base class and also implement one or more interfaces.
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Can a class implement 2 interfaces in Java?

Java does not support "multiple inheritance" (a class can only inherit from one superclass). However, it can be achieved with interfaces, because the class can implement multiple interfaces. Note: To implement multiple interfaces, separate them with a comma (see example below).
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How many interfaces can a class implement in PHP - PHP



Is multiple interfaces possible in Java?

The Java programming language supports multiple inheritance of type, which is the ability of a class to implement more than one interface. An object can have multiple types: the type of its own class and the types of all the interfaces that the class implements.
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Can you inherit multiple interfaces?

No you cannot inherit multiple interfaces, because interfaces cannot be inherited. Interfaces are IMPLEMENTED, not inherited.
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Can an interface implement a class?

A class can implement more than one interface at a time. A class can extend only one class, but implement many interfaces. An interface can extend another interface, in a similar way as a class can extend another class.
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Can we inherit interface?

C# allows the user to inherit one interface into another interface. When a class implements the inherited interface then it must provide the implementation of all the members that are defined within the interface inheritance chain.
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Can we inherit abstract class?

An abstract class cannot be inherited by structures. It can contains constructors or destructors. It can implement functions with non-Abstract methods.
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How many interfaces can a class implement in C#?

The C# language imposes no limit on the number of interfaces.
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What happens if a class implement 2 interfaces having same methods?

No, its an error

If two interfaces contain a method with the same signature but different return types, then it is impossible to implement both the interface simultaneously. According to JLS (§8.4. 2) methods with same signature is not allowed in this case.
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Can an abstract class implement an interface?

Java Abstract class can implement interfaces without even providing the implementation of interface methods. Java Abstract class is used to provide common method implementation to all the subclasses or to provide default implementation.
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How many interfaces can a router have?

An IP address is assigned to each of the router's two “interfaces”. The first router interface is called the WAN (Wide Area Network) interface. This is the side of the router that faces the Internet and has a public IP address. The second router interface is called the LAN (Local Area Network) interface.
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How many interfaces can a router have at max?

You can partition one physical interface into up to 4094 different subinterfaces, one for each VLAN.
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Can we have constructor in interface?

No, you cannot have a constructor within an interface in Java. You can have only public, static, final variables and, public, abstract, methods as of Java7. From Java8 onwards interfaces allow default methods and static methods. From Java9 onwards interfaces allow private and private static methods.
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Can we override abstract method in Java?

A subclass must override all abstract methods of an abstract class. However, if the subclass is declared abstract, it's not mandatory to override abstract methods.
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Can we create object of interface?

Like abstract classes, interfaces cannot be used to create objects (in the example above, it is not possible to create an "Animal" object in the MyMainClass) Interface methods do not have a body - the body is provided by the "implement" class. On implementation of an interface, you must override all of its methods.
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Can an abstract class extend an interface?

An abstract class can declare constructors and destructors. It can extend any number of interfaces. It can extend only one class or one abstract class at a time. In an abstract interface keyword, is optional for declaring a method as an abstract.
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Can class extend multiple classes?

It means a class can extend only a single class at a time. Extending more than one class will lead to code execution failure. When a class extends a class, then it is called single inheritance . If a class extends more than one class, it is called multi-inheritance , which is not allowed in Java.
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Can an interface implement an interface?

An interface can extend any number of interfaces but one interface cannot implement another interface, because if any interface is implemented then its methods must be defined and interface never has the definition of any method.
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Can two interface have same name?

C# allows the implementation of multiple interfaces with the same method name.
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What is difference between inheritance and interface?

Inheritance is the mechanism in java by which one class is allowed to inherit the features of another class. Interface is the blueprint of the class. It specifies what a class must do and not how.
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Can a class be defined inside an interface?

Yes, you can define a class inside an interface. In general, if the methods of the interface use this class and if we are not using it anywhere else we will declare a class within an interface.
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