Can we declare main () method as non static?

You can write the main method in your program without the static modifier, the program gets compiled without compilation errors. But, at the time of execution JVM does not consider this new method (without static) as the entry point of the program.

Can we make main method non-static?

No, JVM invokes main method even before the instantiation of the class. As non-static members or methods cannot be called with the class name directly so main() method should be declared as static.

Why is the main () method declared static?

The main() method is static so that JVM can invoke it without instantiating the class. This also saves the unnecessary wastage of memory which would have been used by the object declared only for calling the main() method by the JVM.

What happens when the main () isn't declared as static?

Bootstrap class loader searches for main function in the class file, if main function is not declared as static, it will trough an error because declaring function as static allows it to be called without instantiating that class file where the main function is.

Why main () in Java is declared as public static void?

Java program's main method has to be declared static because keyword static allows main to be called without creating an object of the class in which the main method is defined. If we omit static keyword before main Java program will successfully compile but it won't execute.

Main Methods

Can we declare main method as final?

Yes, we can declare the main () method as final in Java. The compiler does not throw any error. If we declare any method as final by placing the final keyword then that method becomes the final method. The main use of the final method in Java is they are not overridden.

Can we write main method without void?

Yes. Things like libraries don't have a main method. The main method is the entry point for the program, so you'll have to have a main method somewhere or the code won't execute, but not necessarily in any given Java file.

Can we overload main method?

Yes, we can overload the main method in Java, but When we execute the class JVM starts execution with public static void main(String[] args) method.

Can we have 2 main methods in Java?

From the above program, we can say that Java can have multiple main methods but with the concept of overloading. There should be only one main method with parameter as string[ ] arg.

Can we execute a class without a main method?

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 override static method?

Overloading is the mechanism of binding the method call with the method body dynamically based on the parameters passed to the method call. Static methods are bonded at compile time using static binding. Therefore, we cannot override static methods in Java.

How do I make my main method not static in Java?

If you need to call a non-static member from it, simply put your main code in a class and then from main create a new object of your newly created class.

Can we write main method without String [] args?

What happens if the main() method is written without String args[]? The program will compile, but not run, because JVM will not recognize the main() method. Remember JVM always looks for the main() method with a string type array as a parameter.

What happens if we write main () inside main () method?

Well,you can call a main() within the main() function ,but you should have a condition that does not call the main() function to terminate the program. Otherwise,the program will never return and run infinitely. It will cause a stack overflow when the stack space is used up.

Can main method be abstract?

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 or instance. The abstract is applicable to the object so there is no problem if it contains the main method.

Can we write main method in subclass?

Well, it depends, But usually main method put in sub class. There is quite big difference between in inheritance and shadowing. But you can put it subclass or super class. Remember main method is static.

Can constructor be 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 write static public void main String args?

Yes, we can change the order of public static void main() to static public void main() in Java, the compiler doesn't throw any compile-time or runtime error. In Java, we can declare access modifiers in any order, the method name comes last, the return type comes second to last and then after it's our choice.

Can we write main method in interface?

It cannot have a method body. Java Interface also represents the IS-A relationship. Like a class, an interface can have methods and variables, but the methods declared in an interface are by default abstract (only method signature, no body).

Can main method be private in Java?

Yes, we can declare the main method as private in Java. It compiles successfully without any errors but at the runtime, it says that the main method is not public.

How do you make a non static method?

Can we call non static method in static method?

Solution 1. A static method provides NO reference to an instance of its class (it is a class method) hence, no, you cannot call a non-static method inside a static one. Create an object of the class inside the static method and then call the non-static method using such an object.

Can we inherit static class in Java?

Static methods do not use any instance variables of any object of the class they are defined in. Static methods take all the data from parameters and compute something from those parameters, with no reference to variables. We can inherit static methods in Java.

Can we overload non static method in Java?

No, we cannot override non static method as static method in java.

Can constructor be inherited?

Constructors are not members, so they are not inherited by subclasses, but the constructor of the superclass can be invoked from the subclass.