create table temp (
  id int IDENTITY(1,1) PRIMARY KEY,
  name varchar(32) not null,
  username varchar(32) not null,
  contact varchar(32) not null,
  gender int
);

btnSubmit.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                try
                {
                    int gender = 0;
                    Connection sqlCon = DB_con.getSQLConnection();
                    PreparedStatement ps = sqlCon.prepareStatement(
                            "insert into temp (name, username, contact, gender) values ( ?, ?, ?, ?)"
                            );
                    ps.setString(1, txtName.toString());
                    ps.setString(2, txtUserName.toString());
                    ps.setString(3, txtContact.toString());

                    gender = (rbtnMale.isSelected()) ? 1 :2;
                    System.out.println("value of gender " + gender );
                    ps.setInt(4, gender);
                    int i = ps.executeUpdate();
                    System.out.println("records inserted: "+i);
                    sqlCon.close();
                }
                catch(Exception e)
                {
                    System.out.println(e.toString());
                }
            }
        });