- Can we declare abstract class as final?
- Can we override main method?
- Can a class be declared as abstract without abstract methods?
- Which methods in your class will you declare as abstract?
- Can a method be abstract?
- Can we inherit abstract class?
- Can abstract class have normal methods?
- Which method Cannot be overridden?
- Can abstract class have constructors?
- Can we have main method in abstract class?
- Can final method be overridden?
- Can we override private method?
Can we declare abstract class as final?
In short, an abstract class cannot be final in Java, using both abstract and final modifier with a class is illegal in Java.
An abstract method must be overridden to be useful and called but when you make the abstract method final it cannot be overridden in Java, hence there would be no way to use that method..
Can we override main method?
No, we cannot override main method of java because a static method cannot be overridden. The static method in java is associated with class whereas the non-static method is associated with an object. … Therefore, it is not possible to override the main method in java.
Can a class be declared as abstract without abstract methods?
A class which contains 0 or more abstract methods is known as abstract class. If it contains at least one abstract method, it must be declared abstract. And yes, you can declare abstract class without defining an abstract method in it.
Which methods in your class will you declare as abstract?
To declare an abstract method, use this general form: abstract type method-name(parameter-list); As you can see, no method body is present. Any concrete class(i.e. class without abstract keyword) that extends an abstract class must override all the abstract methods of the class.
Can a method be abstract?
A method without body (no implementation) is known as abstract method. A method must always be declared in an abstract class, or in other words you can say that if a class has an abstract method, it should be declared abstract as well.
Can we inherit abstract class?
An abstract class defines the identity of a class. An interface can inherit multiple interfaces but cannot inherit a class. An abstract class can inherit a class and multiple interfaces. … An abstract class can declare constructors and destructors.
Can abstract class have normal methods?
It can have abstract methods(methods without body) as well as concrete methods (regular methods with body). A normal class(non-abstract class) cannot have abstract methods. … An abstract class can not be instantiated, which means you are not allowed to create an object of it.
Which method Cannot be overridden?
A method declared final cannot be overridden. A method declared static cannot be overridden but can be re-declared. If a method cannot be inherited, then it cannot be overridden. A subclass within the same package as the instance’s superclass can override any superclass method that is not declared private or final.
Can abstract class have constructors?
Yes! Abstract classes can have constructors! Yes, when we define a class to be an Abstract Class it cannot be instantiated but that does not mean an Abstract class cannot have a constructor. Each abstract class must have a concrete subclass which will implement the abstract methods of that abstract class.
Can we have main method in abstract class?
Yes, you can use the main method in abstract class. The main method is a static method so it is associated with Class, not with object/ instance. … In main method, you can not create an instance of the abstract class but you can instantiate other concrete class.
Can final method be overridden?
Any method that is declared as final in the superclass cannot be overridden by a subclass.
Can we override private method?
No, we cannot override private or static methods in Java. Private methods in Java are not visible to any other class which limits their scope to the class in which they are declared.