try (Connection conn = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/test", "root", "12345")) {

            ResultSet rsTables = conn.createStatement().executeQuery("SHOW TABLES");

            while (rsTables.next()) {
                String tableName = rsTables.getString(1);
                tableList.add(tableName);

                ResultSet rsInsert = conn.createStatement()
                        .executeQuery("SELECT * FROM " + tableName);

                while (rsInsert.next()) {
                    String insert = rsInsert.getString(1);
                    String insert1 = rsInsert.getString(2);
                    String insert2 = rsInsert.getString(3);
                    String insert3 = rsInsert.getString(4);
                    tableList.add(insert);
                    tableList.add(insert1);
                    tableList.add(insert2);
                    tableList.add(insert3);

                }
            }

        } catch (SQLException ex) {
            Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
        }