i got illegal start of expression error , plese tell me the mistake where i did...

 import org.springframework.context.*; 
 import java.util.*;
 public class MyListener implements ApplicationListener 
 {
public static void main(String[] args) throws Exception 
{
    long sttime,endtime;

    public void onApplicationEvent(ApplicationEvent ae)
    {

        if(ae.toString().indexOf("ContextRefreshed")!=-1)
        {
            System.out.println("App ctx started at"+new java.util.Date());
            sttime=System.currentTimeMillies();
        }//if
        if(ae.toString().indexOf("Context stopped")!=-1)
        {
            System.out.println("App ctx stpped at"+new java.util.Date());
            endtime=System.currentTimeMillies();
            System.out.println("Appctx is in running mod for"+(endtime-sttime)+"ms");
        }//if
    }//method

}//main

}//class