Why should main be declared static and is declaring it public and void not sufficient?

Answer 1

The static modifier means that it does not have to be instantiated to use it. Before a program runs there are technically no objects created yet, so the main method, which is the entry point for the application must be labeled static to tell the JVM that the method can be used without having first to create an instance of that class. Otherwise, it is the "Which came first, the chicken or the egg?" phenomenon. Your main method should be declared as follows: public static void main (String[] args) { lots of your java code... } As we know, java is a pure OOP , that means everything should be in the class, main. Aso, because main is itself a function, static member functions should not refer to objects of that class. But we can access static functions through classname itself, as: class TestMain { public static void main(String args[]) { body; } } Now, cmd>javac TestMain.java cmd>java TestMain as we know the static member functions has to call through its class name. That's why the programme name must be same as the class name ,where we wrote the main function. Another important point is : static variables or member functions will load during class. That means before creating any instances(objects), the main function is the first runnable function of any program which we run manually, such as : cmd>java TestMain(run) if , any sharing information.

Answer 2

This is so you can run static methods, and can contain static variables.

Without it, this code would not work.

private static getint ()

{

return someint;

}

public void main(String[] args)

{

int i = getint();

}

It will return Cannot call static method in void context blah blah blah.

Answer 3

The main() method in any Java class always has the same signature, that is, public static void main(String args[]). The reason it is static is so that the JVM can call it directly without having to create an instance of the java class where it is declared. Any static java method can be called without having to instantiate the class that defines that static method. The reason we wouldn't want to force the JVM to create an instance of the java class to call the main() method is because creating this instance may be expensive and/or have unwanted side effects and/or require constructor arguments that the JVM doesn't know how to provide.

Answer 4

The java virtual machine first execute the static method and without create the object we cant execute .so using static we can execute .. and public is used to out side the classes we can access..this is the accesspecifire.

Answer 5

Because, only a non static method can be invoked directly without creating an instance of the object and since the main is going to be the first method to be executed, it cannot be invoked first if it is non-static.

Answer 6

becaused java are object orented programing languages its also used class .

Answer 7

static - so that the JVM can run the method without having to instantiate the class object

public - so that the JVM can access it freely without any access issues.