- Can abstract class have static and final variables?
- Can we have a static & final method?
- What is the difference between abstract method and final method?
- Is it possible to inherit from multiple abstract classes in Java?
- Can we override final method?
- Why is main method static?
- Can we have static methods in an abstract class?
- Can we develop a final abstract class?
- Can we use static and abstract together?
- Why we Cannot override static method?
- Can we have static method in interface?
- Can we declare an interface as final?
- Can abstract class have constructors?
- Can we declare constructor as final?
- Can we override main method?
Can abstract class have static and final variables?
An abstract class may contain non-final variables.
Type of variables: Abstract class can have final, non-final, static and non-static variables.
Interface has only static and final variables.
A Java abstract class can have class members like private, protected, etc..
Can we have a static & final method?
Static methods belong to the class, not the instance. … The real problem is that Java lets you call static methods on an instance object. Static methods with the same signature from the parent class are hidden when called from an instance of the subclass. However, you can’t override/hide final methods.
What is the difference between abstract method and final method?
Difference between abstract method and final method in Java. The abstract method is incomplete while the final method is regarded as complete. The only way to use an abstract method is by overriding it, but you cannot override a final method in Java.
Is it possible to inherit from multiple abstract classes in Java?
A: Because Java doesn’t support multiple inheritance. … A: Java has a rule that a class can extend only one abstract class, but can implement multiple interfaces (fully abstract classes). There’s a reason why Java has such a rule.
Can we override final method?
The final method can’t be overridden. A final method declared in the Parent class cannot be overridden by a child class. If we try to override the final method, the compiler will throw an exception at compile time.
Why is main method static?
Java main() method is always static, so that compiler can call it without the creation of an object or before the creation of an object of the class. … Static method of a class can be called by using the class name only without creating an object of a class.
Can we have static methods in an abstract class?
Can an abstract class have static methods? Yes, abstract class can have Static Methods. The reason for this is Static methods do not work on the instance of the class, they are directly associated with the class itself.
Can we develop a final abstract class?
No, you cannot make an abstract class or method final in Java because the abstract and final are the mutually exclusive concept. … 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 use static and abstract together?
If you declare a method in a class abstract to use it, you must override this method in the subclass. But, overriding is not possible with static methods. Therefore, an abstract method cannot be static.
Why we Cannot override static method?
Static methods cannot be overridden because they are not dispatched on the object instance at runtime. The compiler decides which method gets called. Static methods can be overloaded (meaning that you can have the same method name for several methods as long as they have different parameter types).
Can we have static method in interface?
Static Methods in Interface are those methods, which are defined in the interface with the keyword static. … Similar to Default Method in Interface, the static method in an interface can be defined in the interface, but cannot be overridden in Implementation Classes.
Can we declare an interface as final?
If you make an interface final, you cannot implement its methods which defies the very purpose of the interfaces. Therefore, you cannot make an interface final in Java. Still if you try to do so, a compile time exception is generated saying “illegal combination of modifiers − interface and 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 declare constructor as final?
No, a constructor can’t be made final. A final method cannot be overridden by any subclasses. … But, in inheritance sub class inherits the members of a super class except constructors. In other words, constructors cannot be inherited in Java therefore, there is no need to write final before constructors.
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.