singleton program

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;

import java.sql.SQLException;
import java.sql.Statement;
import java.util.Scanner;

public class Emp{
    public static void main(String[] args) {

        System.out.println("Getting Employee Details Using resultset metadata: ");
        Connection con = null;
        String url = "jdbc:oracle:thin:@172.24.137.30:1521:ORA10G";;

        String driver = "oracle.jdbc.driver.OracleDriver";
        String user = "e206227";
        String pass = "VeuFmodax";
        try{
            Class.forName(driver);
            con = DriverManager.getConnection(url, user, pass);
            try{

                Emp e=new Emp();
                Scanner sc=new Scanner(System.in);   
                int ch=sc.nextInt();
                switch(ch)
                {
                case 1: e.viewDetails(con);
                break;
                case 2: e.addDetails(con);  
                break;
                }


            }
            catch (Exception s){
                System.out.println("SQL statement is not executed!");
            }
        }
        catch (Exception e){
            e.printStackTrace();
        }
    }

    public void viewDetails(Connection con)
    {
        try{
            Statement st = con.createStatement();
            ResultSet rs = st.executeQuery("SELECT * FROM employee");

            while(rs.next())
            {
                System.out.print("\t"+rs.getString(1));
                System.out.print("\t"+rs.getString(2));
                System.out.print("\t"+rs.getString(3));
                System.out.print("\t"+rs.getString(4));
                System.out.println("\t"+rs.getString(5));
            }

        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
    }

    public void addDetails(Connection con)
    {
        try
        {
            Statement st = con.createStatement();
            ResultSet rs = st.executeQuery("insert into employee values('emp005','rakesh',23000,7418767778,'js.rakesh@
xyz.com')");
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
    }

}