JTable getSelectedRow nicht zurück, wird die ausgewählte Zeile index

Ich versuche, um Daten in der Zeile, die ausgewählt ist aber getSelectedRow() funktioniert nicht. Tatsächlich, ich verwendete diese Methode in der anderen Klasse, aber es funktioniert. Wenn ich versuche, drucken Sie die Zeile index, der prompt zeigt -1; als nicht gewählt.

Ich habe versucht, die meisten Lösungen, die auf dem internet, aber Sie nicht lösen, meine Lösung.

public Canteen() {
    try {
        jbInit();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

private void jbInit() throws Exception {
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    this.getContentPane().setLayout( null );
    this.setSize( new Dimension(400, 300) );
    this.setTitle( "CANTEEN" );
    jScrollPane1.setBounds(new Rectangle(0, 0, 230, 235));
    jButton1.setText("REFRESH");
    jButton1.setBounds(new Rectangle(0, 235, 100, 20));
    jButton1.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                jButton1_actionPerformed(e);
            }
        });
    jButton2.setText("CLOSE");
    jButton2.setBounds(new Rectangle(120, 235, 110, 20));
    jButton2.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                jButton2_actionPerformed(e);
            }
        });
    jScrollPane1.getViewport().add(jTable1, null);
    this.getContentPane().add(jButton2, null);
    this.getContentPane().add(jButton1, null);
    this.getContentPane().add(jScrollPane1, null);
    jTable1 = new JTable (model);

    String header [] = {"CUSTOMER", "PRODUCT", "QUANTITY","ORDER NO"};
    for (int i = 0; i < 4; i++){
        model.addColumn(header[i]);
        }  

    //refresh every 1 minute 
    Timer timer = new Timer();
    timer.scheduleAtFixedRate(new TimerTask(){
        public void run(){
            model.setRowCount(0);
            try {
                Class.forName(driverName);
                conn = DriverManager.getConnection(url,username, password);
                statement = conn.createStatement();
                ResultSet rs = statement.executeQuery("SELECT USER_NAME, QUANTITY, PRD_NAME, ORDER_NUMBER FROM ORDERS ORDER BY ORDER_NUMBER DESC");
                int count = rs.getRow();
                String user [] = new String [count];
                int i = 0;
                while (rs.next()){
                    String name = rs.getString(1);
                    String prdName = rs.getString(3);
                    int number = rs.getInt(2);
                    int orderNumber = rs.getInt(4);
                    model.insertRow(i,new Object []{name,prdName,number, orderNumber});
                    }
                conn.close();
                }
                    catch (ClassNotFoundException s) {
                            System.out.println("Couldn't find the database driver");
                            System.out.println(s);

                        } 
                        catch (SQLException s) {
                            System.out.println("Couldn't connect to the database\n" +s);
                        }

       }
    },0, 60000); 
    }

private void jButton1_actionPerformed(ActionEvent e) {
    //set from row 0 for refresh
    model.setRowCount(0);

    try {
        Class.forName(driverName);
        conn = DriverManager.getConnection(url,username, password);
        statement = conn.createStatement();
        ResultSet rs = statement.executeQuery("SELECT USER_NAME, QUANTITY, PRD_NAME FROM ORDERS ORDER BY ORDER_NUMBER DESC");
        int count = rs.getRow();
        String user [] = new String [count];
        int i = 0;
        while (rs.next()){
            String name = rs.getString(1);
            String prdName = rs.getString(3);
            int number = rs.getInt(2);
            model.insertRow(i,new Object []{name,prdName,number});
            } 
        conn.close();
        }
    catch (ClassNotFoundException s) {
            System.out.println("Couldn't find the database driver");
            System.out.println(s);

        } 
        catch (SQLException s) {
            System.out.println("Couldn't connect to the database\n" +s);
        }

}

private void jButton2_actionPerformed(ActionEvent e) {
    System.out.println(jTable1.getSelectedRow());
        }
}
Sind Sie mit einem GUI-editor, wie man in NetBeans?
Ich benutze jDeveloper und oracle SQL-developer

InformationsquelleAutor newbie | 2012-09-06

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