Three main methods

[Rrohit rakesh upadhyay]

I wrote the following code and noticed that only class B's main method was executing,Should not all the main methods be executing?And why only class B's why not class A's or C's?
And when i removed main methods from class A and B i got a runtime error "Main methon not foun in class B...............................................".Can anyone explain why?

import java.io.*;

class A
{
	public static void main(String[] args)
	{
		A a=new C();
		a.r(); 
	}
	
	public void r()
	{
		System.out.println("class A");
	}
}

class B extends A
{
	public static void main(String[] args)
	{
		B b=new B();
		b.r();
	}
	public void r()
	{
		System.out.println("class B");
	}
}

class C extends B
{
	public static void main(String[] args)
	{
		C c=new C();
		c.r();
	}
	
	public void r()
	{
		System.out.println("class C");
	}
}

[Jeanne Boyarsky]

Good question. When you run the program, what command do you use? java B?

If so, that is what tells Java what class to look in for the main method. Only one main method can be kicked off by the java command.

If you put these three classes in separate files, it would be clearer as to which method is run.

[Rrohit rakesh upadhyay]

Clear as day now.Thank you Jeanne

[Campbell Ritchie]

Why did you expect the A method to run? Remember static methods do not override each other. Look at this FAQ.
Why did you write the import declaration? You don't appear to be using anything from the java.io package.