Connection conn = DB.getconnnection();
PreparedStatement ps = conn.prepareStatement("select 1 from tbl_user where username = ? and password = ?");
ps.setString(1,txtUsername.getText());
ps.setString(2,String.valueOf(txtPassword.getPassword()));
ResultSet rs=ps.executeQuery();
String status=rs.getString("");
System.out.println(status);
conn.close();