Extended Runtime
Use of Static keyword in Java?
My class compiles OK but at runtime I get a ‘class does not have a main method’ error. Could this be because I didn’t declare it static? the problem is if I declare it static I get methods that cannot be referenced from a static context. See following code example:
import java.awt.*;
import java.awt.event.*;
public class Test extends Frame
{
public void main(String[] args)
{
Frame frame = new Test();
addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{dispose(); System.exit(0);}
}
);
}
}
What exactly is wrong with this?
static functions or variables don’t need to your class be instantaned. in your example public void main is a subroutine and it can be called if your class instantaned like
Test t=new Test();
t.main(new String[] {“1″,”2″,…});
in command line when you type
$> java Test
your class is not an object, so java interpreter can call the static main subroutine without declaring an object from your class. so you have to declare it as public static void main…
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