- Can we make abstract class as static in Java?
- Can we override static method?
- Can abstract class have constructor?
- Can we declare interface as final?
- Can we declare interface as static?
- Why we Cannot override static method?
- Can we override main method?
- Can we declare class as final?
- Can abstract class have static and final variables?
- Can we write a static modifier in an abstract class?
- Can we declare abstract class as final?
- Why is main method static?
- Can we override private method?
- What is the use of static methods in interface?
- Can an interface extend an abstract class?
Can we make abstract class as static in Java?
You cannot create an abstract static method.
you can call that static method by using abstract class,or by using child class who extends the abstract class.
Also you can able to call static method through child class instance/object..
Can we override static method?
Can we Override static methods in java? We can declare static methods with the same signature in the subclass, but it is not considered overriding as there won’t be any run-time polymorphism. Hence the answer is ‘No’.
Can abstract class have constructor?
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 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 we declare interface as 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. … If same name method is implemented in the implementation class then that method becomes a static member of that respective class.
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 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.
Can we declare class as final?
You can declare some or all of a class’s methods final. You use the final keyword in a method declaration to indicate that the method cannot be overridden by subclasses. … Note that you can also declare an entire class final. A class that is declared final cannot be subclassed.
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 write a static modifier in an abstract class?
A Java class containing an abstract class must be declared as abstract class. An abstract method can only set a visibility modifier, one of public or protected. That is, an abstract method cannot add static or final modifier to the declaration.
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.
Why is main method static?
Why the main () method in Java is always 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. In any Java program, the main() method is the starting point from where compiler starts program execution.
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.
What is the use of static methods in interface?
Java interface static method helps us in providing security by not allowing implementation classes to override them. We can’t define interface static method for Object class methods, we will get compiler error as “This static method cannot hide the instance method from Object”.
Can an interface extend an abstract class?
Remember, a Java class can only have 1 superclass, but it can implement multiple interfaces. Thus, if a class already has a different superclass, it can implement an interface, but it cannot extend another abstract class. Therefore interfaces are a more flexible mechanism for exposing a common interface.