Can you cast an object to an interface Java?

Can you cast an object to an interface Java?

Yes, you can. If you implement an interface and provide body to its methods from a class. You can hold object of the that class using the reference variable of the interface i.e. cast an object reference to an interface reference.

Can you cast something to an interface?

3 Answers. You can cast objects either up or down the type hierarchy; sometimes this is safe, and sometimes it isn’t. If you attempt to cast a variable to an incompatible type (i.e. try to convince the compiler it’s something it’s not), you’ll get a runtime exception (i.e. error).

When can an object reference can be cast to an interface reference?

An object reference be cast to an interface reference when the object implements thereferenced interface.

What is Upcasting in Java?

Upcasting: Upcasting is the typecasting of a child object to a parent object. Upcasting can be done implicitly. Upcasting gives us the flexibility to access the parent class members but it is not possible to access all the child class members using this feature.

What is a ClassCastException in Java?

ClassCastException is a runtime exception raised in Java when we try to improperly cast a class from one type to another. It’s thrown to indicate that the code has attempted to cast an object to a related class, but of which it is not an instance.

What is casting how it is used in interface?

Casting to an interface allows you to pass/refer to objects with the same behavior. For example, if you wanted to make a report from a bunch of forecasts you could write code like this: /* Collect some forecastable things */ List forecastables = Arrays.

What is typecasting Java?

Typecasting, also known as type conversion in Java, is a process that helps developers to assign a primitive data type value to other primitive data types. So, it becomes necessary to cast the subclass object in Java into a type that initially existed.

Can an interface extend another interface?

An interface can extend other interfaces, just as a class subclass or extend another class. However, whereas a class can extend only one other class, an interface can extend any number of interfaces. The interface declaration includes a comma-separated list of all the interfaces that it extends.

Can one interface extend another interface?

An interface can extend another interface in the same way that a class can extend another class. The extends keyword is used to extend an interface, and the child interface inherits the methods of the parent interface.