/**
*
* @author
*
* V Prakash
*
* Software Engineer
*
*
*
*/
import java.net.ServerSocket;
import javax.swing.JOptionPane;
import javax.swing.JFrame;
import java.io.IOException;
import java.net.BindException;
public class SingleInstance
{
public static ServerSocket serverSocket;
public static String errortype = "Access Error";
public static String error = "Application already running.....";
public static void main(String as[])
{
try{
//creating object of server socket and bind to some port number
serverSocket = new ServerSocket(16892);
//do not put common port number like 80,8080,8081 etc.
//Because they are already used by system
JFrame jf = new JFrame();
jf.setVisible(true);
jf.setSize(200, 200);
}
catch (BindException exc){
JOptionPane.showMessageDialog(null,error,errortype,JOptionPane.ERROR_MESSAGE);
System.exit(0);
}
catch (IOException exc){
JOptionPane.showMessageDialog(null, error, errortype, JOptionPane.ERROR_MESSAGE);
System.exit(0);
}
}
}
