Can we create the final abstract method in Java?
No , we can't create the final abstract method. If we declare any class as final then it means that no other class can override it whereas when we declare any class as abstract , it means that we are just providing the defination part of the class and it should be compulsory override in the child class to provide its implementation.
Can final methods be overridden in abstract class?
To do this abstract method have to be overridden but final methods cannot be overridden. can abstract class have final methods in java?
What is the difference between final class and abstract class?
And also, for the abstract classes, we need to create a child class to provide the implementation whereas for final class we can’t create child class. therefore, a final abstract combination is illegal for classes. Hence, a final class cannot contain abstract methods whereas an abstract class can contain a final method.
Can a non abstract class have abstract methods?
An abstract class can have both abstract methods (methods without body) as well as the concrete methods (regular methods with the body). However, a normal class (non-abstract class) cannot have abstract methods. The following is an example of how an abstract class is declared.
Can we have abstract final method in Java?
No, you cannot make an abstract class or method final in Java because the abstract and final are mutually exclusive concepts.
Can we define final method inside abstract class?
Yes, it can. But the final method cannot be abstract itself (other non-final methods in the same class can be).
Can a static method be abstract?
A static method belongs to class not to object instance thus it cannot be overridden or implemented in a child class. So there is no use of making a static method as abstract.
Can final method be overridden?
Can We Override a Final Method? No, the Methods that are declared as final cannot be Overridden or hidden. For this very reason, a method must be declared as final only when we're sure that it is complete.
Can we declare final variable in abstract class?
No you can't declare final variables inside an Abstract class.
Can we declare final method in interface?
No ;Interface only have abstract methods. methods. interface method can not be final .
Can abstract class have final private modifiers?
If a method of a class is private, you cannot access it outside the current class, not even from the child classes of it. But, incase of an abstract method, you cannot use it from the same class, you need to override it from subclass and use. Therefore, the abstract method cannot be private.
Can we declare abstract class without abstract method?
And yes, you can declare abstract class without defining an abstract method in it. Once you declare a class abstract it indicates that the class is incomplete and, you cannot instantiate it. Hence, if you want to prevent instantiation of a class directly you can declare it abstract.
Can we write the final method with implementation?
Yes, We can write the final method with implementation.
Can methods be defined in abstract class?
In Abstract Class methods may be defined or not. If we extend the abstract class then only it has meaning, so what ever methods we declare or defined in Abstract call it will over ride in subclass. So we can declare a method as final in Abstract class, and it will be over ridden in subclass.
Can you subclass a method?
Of course, it means you can subclass it, but you cannot override that particular method.
Can a subclass override a method?
Yes, those methods cannot be overriden in subclasses. An example of that is the template method pattern...
Can an abstract class have a final?
These methods must be implemented in the abstract class, but it's up to the implementer to decide whether extending classes need to override them or not. Yes, it can.
Can you declare abstract final?
Yes, there may be "final" methods in "abstract" class. But, any "abstract" method in the class can' t be declared final. It will give "illegal combination of modifiers: abstract and final" error. public abstract final void show (); illegal combination of modifiers: abstract and final. Here is the working example of the implementation.
Can you subclass a template method pattern?
An example of that is the template method pattern... Of course, it means you can subclass it, but you cannot override that particular method. Yes. The abstract modifier makes it possible to omit some of the implementation of a class (i.e. have some abstract methods) but does not impose any restrictions on you.
What is the key word for abstract?
1. Uses the “abstract” key word. Uses the “final” key word. 2. This helps to achieve abstraction. This helps to restrict other classes from accessing its properties and methods. 3. For later use, all the abstract methods should be overridden. Overriding concept does not arise as final class cannot be inherited.
Why do we use final classes?
The main purpose of using a final class is to prevent the class from being inherited (i.e.) if a class is marked as final, then no other class can inherit any properties or methods from the final class. If the final class is extended, Java gives a compile-time error. The following is an example of how a final class is declared.
What is the final class in Java?
Final Class: A class which is declared with the “Final” keyword is known as the final class. The final keyword is used to finalize the implementations of the classes, the methods and the variables used in this class.
Can a final class be inherited?
As a final class cannot be inherited. abstract class A {. public final void methodOne () {}. }. However, an abstract class can have a final method. This final method is treated like a normal method with a body which cannot be overridden.
Can a final method be overridden?
All the abstract methods should be overridden in the child class to provide the implementation. However, from the definition, a final method can’t be overridden. Therefore, an abstract final combination is illegal for the methods. And also, for the abstract classes, we need to create a child class to provide the implementation whereas ...