- What is a static method?
- Can we declare constructor as private?
- Can we override static method?
- Why we Cannot override static method?
- Can we inherit static class?
- Can we change the value of static variable?
- Can abstract class have constructor?
- Can a constructor be abstract?
- Can constructor be static or final?
- Can we declare static variable in constructor?
- Can constructor throw exception?
- Can we create constructor in static class?
- Can we initialize static variable in constructor C++?
- Is constructor by default final?
- Can a constructor be final?
- Why is main method static?
- Why constructor is not overridden?
What is a static method?
A static method (or static function) is a method defined as a member of an object but is accessible directly from an API object’s constructor, rather than from an object instance created via the constructor..
Can we declare constructor as private?
Yes, we can declare a constructor as private. If we declare a constructor as private we are not able to create an object of a class. We can use this private constructor in the Singleton Design Pattern.
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’.
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 inherit static class?
Creating a static class is therefore basically the same as creating a class that contains only static members and a private constructor. … Static classes are sealed and therefore cannot be inherited. They cannot inherit from any class except Object. Static classes cannot contain an instance constructor.
Can we change the value of static variable?
It is a static variable so you won’t need any object of class in order to access it. It’s final so the value of this variable can never be changed in the current or in any class.
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 a constructor be abstract?
You can’t have an abstract constructor, as abstract means you need to provide the implementation for that at some point of time in your subclass. But you cannot override constructor. There will be no point in having an abstract constructor : Since the constructor needs to be of the same name as of class.
Can constructor be static or final?
The static , final and abstract keywords are not meaningful for a constructor because: static members belong to a class, but the constructor is needed to create an object. An abstract class is a partially implemented class, which contains abstract methods to be implemented in child class.
Can we declare static variable in constructor?
You can define a static field using the static keyword. If you declare a static variable in a class, if you haven’t initialized it, just like with instance variables compiler initializes these with default values in the default constructor. Yes, you can also initialize these values using the constructor.
Can constructor throw exception?
Yes, constructors are allowed to throw an exception in Java. A Constructor is a special type of a method that is used to initialize the object and it is used to create an object of a class using the new keyword, where an object is also known as an Instance of a class.
Can we create constructor in static class?
Yes, a static class can have static constructor, and the use of this constructor is initialization of static member. Suppose you are accessing the first EmployeeName field then constructor get called this time, after that it will not get called, even if you will access same type member.
Can we initialize static variable in constructor C++?
As static variables are initialized only once and are shared by all objects of a class, the static variables are never initialized by a constructor. Instead, the static variable should be explicitly initialized outside the class only once using the scope resolution operator (::).
Is constructor by default final?
apply a final keyword to a method means you cannot override that method. but by default in java no constructor can be overridden. so there is no need to use final keyword with a constructor . A constructor can’t inherited so can’t be overridden , so there is no use of making constructor final.
Can a constructor be final?
No, a constructor can’t be made final. A final method cannot be overridden by any subclasses. … In other words, constructors cannot be inherited in Java therefore, there is no need to write final before constructors.
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.
Why constructor is not overridden?
Constructor Overriding is never possible in Java. This is because, Constructor looks like a method but name should be as class name and no return value. Overriding means what we have declared in Super class, that exactly we have to declare in Sub class it is called Overriding.