actionPerformedメソッド＆jbuttonを使用して整数配列リストに値を追加する方法は？

Question

すべて私はこのコードに小さな問題があります。私はそれが何か小さいと言うだろう。ボタンを押すたびにarrayListに値を追加したいと思います。何が起こっているのですか？ボタンを押すと、クリックされた最後の値だけが保存されます。すべての値を保存するにはどうしたらいいですか？ここで

は、コードの一部は、私は問題が何であるか見当がつかない...

public void actionPerformed(ActionEvent e) { 

      seatArr = new ArrayList<Integer>(); 
      int a; 

      if(e.getSource() instanceof JButton){ 

       bookedIcon = new ImageIcon("images/bookedSeat.png"); 

       a = Integer.parseInt(e.getActionCommand()); 
       seat = a; 
       a =a- 1; 
       seatsA[a].setIcon(bookedIcon); 

        seatArr.add(seat); 
       try { 
        stmt.executeUpdate("UPDATE seats SET type = 'booked' WHERE seatNum ="+seat); 
       } catch (SQLException e1) { 
        // TODO Auto-generated catch block 
        e1.printStackTrace(); 
       } 
      } 

    } 

で、それは私には大丈夫に見えます...ここで は、コードの残りの部分です....

//start of class------------------------------------------------ 
public class SeatMap extends JFrame implements ActionListener{ 

    static Connection conn; 
    static Statement stmt, stmt1; 
    static ResultSet rs, rs1; 
    JComboBox <Integer> adultCombo; 
    JComboBox <String> childCombo; 
    String[] adultArray = {"0", "1", "2", "3"}; 
    String[] childArray = {"0", "1", "2"}; 
    JLabel childLabel; 
    Icon bookedIcon; 
    JButton nextButton, previousButton; 
    public static ArrayList<Integer> seatArr; 

    int seat = 0; 
    int counter; 
    JButton[] seatsA = new JButton[30]; 


//start of main-------------------------------------------------- 
    public static void main(String [] args){ 
     JFrame frame = new SeatMap(); 
     frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);//closes the program when x is pressed 
    } 
//start of frame------------------------------------------------ 
    public SeatMap(){ 
     super("Pick a Seat"); 

     try { 
      Class.forName("com.mysql.jdbc.Driver"); 

      conn = DriverManager.getConnection("jdbc:mysql://localhost/airlines","root", ""); 
      //Create a statement 
      stmt = conn.createStatement(); 
      rs = stmt.executeQuery("SELECT seatNum, type FROM seats"); 



     //--------------------------------------------------- 
     JPanel comboPanel = new JPanel(); 
     JLabel adultLabel = new JLabel("Adult Tickets: "); 
     childLabel = new JLabel("Child Ticket: "); 
     childLabel.setAlignmentX(LEFT_ALIGNMENT); 
     childLabel.setVisible(false); 

     adultCombo = new <String>JComboBox(adultArray); 
     adultCombo.addActionListener(this); 

     childCombo = new <String>JComboBox(childArray); 
     childCombo.setVisible(false); 

     comboPanel.add(adultLabel); 
     comboPanel.add(adultCombo); 
     comboPanel.add(childLabel); 
     comboPanel.add(childCombo); 
     Icon itbIcon = new ImageIcon("images/freeSeat.png"); 

     //setting center panel---------------------------------------------- 
      JPanel centerPanel = new JPanel(); 
      centerPanel.setLayout(new BoxLayout(centerPanel, BoxLayout.Y_AXIS)); 
      centerPanel.add(comboPanel); 
     //setting label for seats------------------------------------------------ 
      JLabel label1 = new JLabel("Pick a seat: ", SwingConstants.CENTER); 
      label1.setFont(new Font("Sans-serif", Font.PLAIN, 25)); 
      label1.setAlignmentX(CENTER_ALIGNMENT); 
      centerPanel.add(label1); 

      JPanel panel1 = new JPanel(new GridLayout(10,3)); 


     //for loop to print seats------------------------------------------------------------------------ 
      while(rs.next()){ 
       //System.out.println(rs.getString("seatNum")); 

       int c = Integer.parseInt(rs.getString("seatNum")); 
       c = c - 1; 

       seatsA[c] = new JButton(String.valueOf(c + 1)); 

       seatsA[c].setBackground(Color.WHITE); 

       if(rs.getString("type").equals("free")){ 
        seatsA[c].setIcon(itbIcon); 
        seatsA[c].addActionListener(this); 
       } 

       else if(rs.getString("type").equals("booked")){ 
        bookedIcon = new ImageIcon("images/bookedSeat.png"); 
        seatsA[c].setIcon(bookedIcon); 
        seatsA[c].setEnabled(false); 
       } 

       panel1.add(seatsA[c]); 


      //} 
      panel1.setAlignmentX(CENTER_ALIGNMENT); 
      centerPanel.add(panel1); 
      } 
      //adding buttons--------------------------------------------- 

      JPanel buttonPanel = new JPanel(); 
      buttonPanel.setLayout(new BoxLayout(buttonPanel, BoxLayout.X_AXIS)); 
      buttonPanel.setAlignmentX(CENTER_ALIGNMENT); 

      previousButton = new JButton("Previous"); 
      previousButton.setBackground(new Color(102,200,1)); 
      previousButton.setFont(new Font("Sans-serif", Font.PLAIN, 20)); 
      previousButton.setAlignmentX(JButton.CENTER_ALIGNMENT); 
      previousButton.addActionListener(new ActionListener() { 
        public void actionPerformed(ActionEvent e) { 
         dispose(); 
         try { 
          rs.close(); 
          stmt.close(); 
          conn.close(); 
         } catch (SQLException e1) { 
          // TODO Auto-generated catch block 
          e1.printStackTrace(); 
         } 

         seatArr.clear(); 
         JFrame form = new Form(); 

        }}); 
      buttonPanel.add(previousButton); 

      nextButton = new JButton("Next"); 
      nextButton.setBackground(new Color(102,200,1)); 
      nextButton.setFont(new Font("Sans-serif", Font.PLAIN, 20)); 
      nextButton.setAlignmentX(JButton.CENTER_ALIGNMENT); 
      nextButton.addActionListener(new ActionListener() { 
        public void actionPerformed(ActionEvent e) { 
         try { 

          String resNum = Form.getReservationNum(); 
          System.out.println(seatArr); 
          stmt.executeUpdate("UPDATE users SET seats='"+seatArr+"' WHERE reservationNum ='"+resNum+"'"); 

          seatArr.clear(); 
          dispose(); 

          rs.close(); 
          stmt.close(); 
          conn.close(); 
         } catch (SQLException e1) { 
          // TODO Auto-generated catch block 
          e1.printStackTrace(); 
         } 
         JFrame ticket = new Ticket(); 
         } 
        }); 


      buttonPanel.add(nextButton); 

      centerPanel.add(buttonPanel); 
      //----------------------------------------------------------- 

    //building header and footer------------------------------------------- 


      JPanel header = new JPanel(); 
      HeadAndFooter.head(header); 
      JPanel footer = new JPanel(); 
      HeadAndFooter.footer(footer); 


    //adding panels to the content pane------------------------------------ 
      JPanel mainPanel = new JPanel(); 
      mainPanel.setLayout(new BorderLayout()); 
      mainPanel.add(header, BorderLayout.NORTH); 
      mainPanel.add(centerPanel, BorderLayout.CENTER); 
      mainPanel.add(footer, BorderLayout.SOUTH); 
      getContentPane().add(mainPanel);//adding panels to the frame 
     //---------------------------------------------------------------------------------------------- 
     setVisible(true); 
     setSize(700,650); 



     }catch (Exception e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 

    } 

public void actionPerformed(ActionEvent e) { 

      seatArr = new ArrayList<Integer>(); 
      int a; 

      if(e.getSource() instanceof JButton){ 

       bookedIcon = new ImageIcon("images/bookedSeat.png"); 

       a = Integer.parseInt(e.getActionCommand()); 
       seat = a; 
       a =a- 1; 
       seatsA[a].setIcon(bookedIcon); 

        seatArr.add(seat); 
       try { 
        stmt.executeUpdate("UPDATE seats SET type = 'booked' WHERE seatNum ="+seat); 
       } catch (SQLException e1) { 
        // TODO Auto-generated catch block 
        e1.printStackTrace(); 
       } 
      } 

     String choice = adultCombo.getSelectedItem().toString(); 

     if(choice.equals("0")){ 
      childCombo.setVisible(false); 
      childLabel.setVisible(false); 
     } 

     else{ 
      childCombo.setVisible(true); 
      childLabel.setVisible(true); 
     } 
    } 

} 

Answer 1

seatArr = new ArrayList（）;

問題は、アクションを実行するたびにseatArrリストを初期化しているため、基本的にリストをリセットして最新の値を追加しています。