Question: Can We Remove Static From Main 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..

Can we call instance method from static method?

A static method belongs to the class and not the instance. It can even be executed using the name of the class directly without any instance of the class. … It may get an instance as a method argument and through that reference, it can call an instance method.

Can we override constructor?

Constructor looks like method but it is not. It does not have a return type and its name is same as the class name. But, a constructor cannot be overridden. If you try to write a super class’s constructor in the sub class compiler treats it as a method and expects a return type and generates a compile time error.

Can we have 2 main methods in Java?

The answer is no; there can only one “main” method – where “main” means an entry point you can “run”. You can code overloaded versions as in your example, but they can’t be “run”. There can be more than one main method in a single program. But JVM will always calls String[] argument main() method.

Should I use static methods?

You should use static methods whenever, The code in the method is not dependent on instance creation and is not using any instance variable. A particular piece of code is to be shared by all the instance methods. The definition of the method should not be changed or overridden.

Are static methods good?

Static methods are a valuable and valid method of object creation. Overloaded constructors that take different arguments are not very clear and are often made clearer by replacing them with a static constructor.

Can we override the static methods?

Can we override a static method? No, we cannot override static methods because method overriding is based on dynamic binding at runtime and the static methods are bonded using static binding at compile time. So, we cannot override static methods.

Which methods 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 you use this () and super () both in a constructor?

Because if you use this() and super() together in a constructor it will give compile time error. Because this() and super() must be the first executable statement. If you write this() first than super() will become the second statement and vice-versa. That’s why we can’t use this() and super() together.

Can we override final method of abstract class?

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 it illegal for a static method to invoke a non static method?

A static method is not associated with a specific instance. A non-static method is a method that executes in the context of an instance . Without an instance it makes no sense to call one, so the compiler prevents you from doing so – ie it’s illegal.

Can we override final method?

A final method in a superclass cannot be overridden in a subclass—this guarantees that the final method implementation will be used by all direct and indirect subclasses in the hierarchy. Methods that are declared private are implicitly final , because it’s not possible to override them in a subclass.

What is the difference between static and final?

static means there is only one copy of the variable in memory shared by all instances of the class. The final keyword just means the value can’t be changed. Without final , any object can change the value of the variable.

Can we execute a program without main?

Yes, we can execute a java program without a main method by using a static block. Static block in Java is a group of statements that gets executed only once when the class is loaded into the memory by Java ClassLoader, It is also known as a static initialization block.

Can we inherit static method in Java?

Static methods in Java are inherited, but can not be overridden. If you declare the same method in a subclass, you hide the superclass method instead of overriding it. Static methods are not polymorphic. At the compile time, the static method will be statically linked.

Why is the main () method declared 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. So, the compiler needs to call the main() method.

Why static methods should be avoided?

Just because static methods don’t take an instance variable as a parameter does not mean that they are not useful. … Creating static methods that take an instance is bad practice because any method that takes an instance should probably be an instance method.

Why can’t we call non static method from static method?

You can’t call a non-static method from a static method, because the definition of “non-static” means something that is associated with an instance of the class. You don’t have an instance of the class in a static context. A static method means that you don’t need to invoke the method on an instance.

Can we inherit private method in Java?

You can only call a private member method in its definition class. … say() because derived classes can’t inherit private methods from its base class. Only protected and public methods/variables can be inherited and/or overridden.

Why do we need static methods?

A static method has two main purposes: For utility or helper methods that don’t require any object state. Since there is no need to access instance variables, having static methods eliminates the need for the caller to instantiate the object just to call the method.

Can we call non static method from Main?

You can’t call a non-static method from a static method, because the definition of “non-static” means something that is associated with an instance of the class. You don’t have an instance of the class in a static context. A static method means that you don’t need to invoke the method on an instance.