execução fora de ordem sem thread

public Hashtable listaDeSuportesPorPlantas(String[] planta, String projeto,
            double origem_x, double origem_y, double origem_z)throws SQLException{
        Statement st;
        Hashtable listagem = new Hashtable();
        int i = 0;
        int contaSuportes = 0;
        st = conn.createStatement();
        int k = 0;
        
        while ( i < planta.length){
            System.out.println(planta[i]  + " " + i +"/" + planta.length);
            
            // lista todas as vistas de uma planta
            ResultSet resultPlantas = st.executeQuery("SELECT pd121.DRAWING_NO," +
                    " pd122.DWG_VIEW_X_LOW," +
                    " pd122.DWG_VIEW_Y_LOW," +
                    " pd122.DWG_VIEW_Z_LOW," +
                    " pd122.DWG_VIEW_X_HIGH," +
                    " pd122.DWG_VIEW_Y_HIGH," +
                    " pd122.DWG_VIEW_Z_HIGH " +
                    "FROM PD_" + projeto +
                    ".PDTABLE_121 pd121 INNER JOIN PD_" + projeto +
                    ".PDTABLE_122 pd122 ON " +
                    "pd121.DWG_INDEX_NO = pd122.DWG_INDEX_NO " +
                    "WHERE pd121.DRAWING_NO = '" + planta[i] +"'");
                      
            
            while (resultPlantas.next()){
                System.out.println(resultPlantas.getString(1));
                System.err.println(" --------------------   ///  ----------------------");
                double plan_x_min = Double.parseDouble(resultPlantas.getString(2)) / 80;
                double plan_y_min = Double.parseDouble(resultPlantas.getString(3)) / 80;
                double plan_z_min = Double.parseDouble(resultPlantas.getString(4)) / 80;
                
                double plan_x_max = Double.parseDouble(resultPlantas.getString(5)) / 80;
                double plan_y_max = Double.parseDouble(resultPlantas.getString(6)) / 80;
                double plan_z_max = Double.parseDouble(resultPlantas.getString(7)) / 80;
                
                double plan_x_min_ok = verifMin(plan_x_min, plan_x_max);
                double plan_y_min_ok = verifMin(plan_y_min, plan_y_max);
                double plan_z_min_ok = verifMin(plan_z_min, plan_z_max);
                
                double plan_x_max_ok = verifMax(plan_x_min, plan_x_max);
                double plan_y_max_ok = verifMax(plan_y_min, plan_y_max);
                double plan_z_max_ok = verifMax(plan_z_min, plan_z_max);
                
                
                plan_x_min_ok = plan_x_min_ok + origem_x;
                plan_y_min_ok = plan_y_min_ok + origem_y;
                plan_z_min_ok = plan_z_min_ok + origem_z;
                
                plan_x_max_ok = plan_x_max_ok + origem_x;
                plan_y_max_ok = plan_y_max_ok + origem_y;
                plan_z_max_ok = plan_z_max_ok + origem_z;
                
                System.out.println(plan_x_min);
                System.out.println(plan_y_min);
                System.out.println(plan_z_min);
                System.out.println(plan_x_max);
                System.out.println(plan_y_max);
                System.out.println(plan_z_max);
            }
            i++;
        }
        return listagem;
    }

4417-795-DES-0-TUB-215 0/1
4417-795-DES-0-TUB-215
 --------------------   ///  ----------------------
-343000.0
-202799.9875
100000.0
-362500.0
-189799.9875
 --------------------   ///  ----------------------
 --------------------   ///  ----------------------
107040.0
4417-795-DES-0-TUB-215
 --------------------   ///  ----------------------
-343000.0
-226599.9875
100000.0
-351000.0
-202799.9875
107040.0
4417-795-DES-0-TUB-215
-343000.0
-202799.9875
107040.0
-362500.0
-189799.9875
115000.0
4417-795-DES-0-TUB-215
-343000.0
-226599.9875
107040.0
-351000.0
-202799.9875
115000.0