SQL Add Values

import java.sql.*;

import javax.swing.JOptionPane;
public class Session {
    public Session(){
        try{

            //CONNECT TO DATABASE
            Connection myConn = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/test", "root", "admin");

            //CREATE STATEMENT
            Statement mySmt = myConn.prepareStatement("UPDATE addTest SET id = id + 1");

            //EXECUTE SQL QUERY
            mySmt.executeUpdate("UPDATE addTest SET id = id + 1");
        }catch (Exception exc){
            exc.printStackTrace();
            JOptionPane.showMessageDialog(null, exc.getMessage());
        }
    }

    public static void main(String args[]){
        new Session();
    }
}