Java中的语法错误（JavaFX）

Question

我意识到这可能不是最独特的问题，但我一直试图弄清楚这个程序的语法问题，一直没有弄清楚。这里就是我得到的语法错误：

});  
      catch 

下面的代码：

public class MySQLGUI extends Application { 
    public void start(Stage primaryStage) { 
     TextField field = new TextField(); 
     field.setPrefWidth(420); 
     TextField order = new TextField(); 
     order.setPrefWidth(420); 
     TextField where = new TextField(); 
     where.setPrefWidth(420); 
     Button button = new Button("Retrieve Records"); 
     TextArea table = new TextArea(); 
     table.setEditable(false); 


     HBox tfield = new HBox(); 
     tfield.getChildren().addAll(new Label("Fields:"),field); 
     tfield.setSpacing(10); 
     HBox torder = new HBox(); 
     torder.getChildren().addAll(new Label("Order:"),order); 
     torder.setSpacing(10); 
     HBox twhere = new HBox(); 
     twhere.getChildren().addAll(new Label("Where:"),where); 
     twhere.setSpacing(7); 
     VBox top = new VBox(); 
     top.setSpacing(10); 
     top.getChildren().addAll(tfield,torder,twhere,button); 
     FlowPane pane = new FlowPane(Orientation.HORIZONTAL); 
     pane.getChildren().addAll(top,table); 

     // Set scene 
     Scene scene = new Scene(pane, 480, 313); 
     primaryStage.setTitle("MySQLGUI"); // Set the stage title 
     primaryStage.setScene(scene); // Place the scene in the stage 
     primaryStage.show(); // Display the stage 
     Connection conn = null; 
     try { 
      conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/pcparts", "root", "password"); 
      System.out.println("Database connected"); 
     } catch (SQLException e) { 
      System.out.println("Cannot connect"); 
     } 
     try { 
      java.sql.Statement st = conn.createStatement(); 

      String query = "select " + field.getText(); 
      query += " from customers"; 
      query += " where " + where.getText(); 
      query += " order by " + order.getText(); 
      button.setOnAction(new EventHandler<ActionEvent>() { 
       public void handle(ActionEvent event) { 
        java.sql.ResultSet rSet = st.executeQuery(query); 
        while (rSet.next()) { 
         table.setText(rSet.getString(1) + " " + rSet.getString(2) + " " + rSet.getString(3) + " " + rSet.getString(4) + " " + rSet.getString(5) + " " + rSet.getString(6)); 
        } 
       } 
      } 
     });  
     catch (SQLException ex) { 
     // handle the error 
     table.setText("OOPS..."); 
     } 
    } 
    public static void main(String[] args) { 
     launch(args); 
    } 
} 

Answer 1

您放置）;一个花括号太晚了。部分代码应该是：

try 
{ 
    /*Your code*/ 
    button.setOnAction(new EventHandler<ActionEvent>() { 
     /*More code*/ 
    }); 
} 
catch(SQLException ex) 
{ 
    /*Even more code*/ 
} 

这只是一个小小的错误。

Answer 2

一个try catch语句的一般语法是：

try { 
    tryStatements 
} 
catch(exception){catchStatements 
} 
finally { 
    finallyStatements 
}