Common

Can you create an instance of a final class?

Can you create an instance of a final class?

A final class can have instances. You cannot create an instance of an abstract class using the new operator. An abstract class can be extended. You can always successfully cast a subclass to a superclass.

Is the object class final?

The returned Class object is the object that is locked by static synchronized methods of the represented class. As it is final so we don’t override it.

Can you inherit a final class?

The main purpose of using a class being declared as final is to prevent the class from being subclassed. If a class is marked as final then no class can inherit any feature from the final class. You cannot extend a final class.

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How do you make an object final in Java?

You declare a reference as final and not the actual object. That means, you cannot change the value of the reference (which is an address pointing to the object). So once you declare a reference as final, you cannot reassign it to another object. So declaring a variable as final is like making it a constant.

How do you create a final class?

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Is final class Cannot be overloaded?

Yes, we can declare overloaded methods as final. Note: Final method can not be overridden. See the below example.

Can we make class as final in Java?

A class can be made final by using the final keyword. The final class cannot be inherited and so the final keyword is commonly used with a class to prevent inheritance.

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Can a final class be a subclass?

A class that is declared final cannot be subclassed. This is particularly useful, for example, when creating an immutable class like the String class.

Can final class have non final methods?

In effect, yes it does. A method in a final class cannot be overridden.

Can we make class final in Java?

How do you create a final class in Java?

To create an immutable class in Java, you have to do the following steps.

  1. Declare the class as final so it can’t be extended.
  2. Make all fields private so that direct access is not allowed.
  3. Don’t provide setter methods for variables.
  4. Make all mutable fields final so that its value can be assigned only once.