Question

我正在使用Oracle官方页面上的示例代码。用于排序和过滤表数据的那个。在原始变体中，它有两个字段 - 一个用于输入过滤条件，另一个用于显示从网格中选择哪一行。我不需要第二个，只想留下过滤器字段，但似乎我想念一些东西。下面是我的代码，其中包含对我认为不必要的代码的评论：

public TableFilterDemo() {
        super();
        setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));

        //Create a table with a sorter.
        MyTableModel model = new MyTableModel("customers.dat");
        sorter = new TableRowSorter<MyTableModel>(model);
        table = new JTable(model);
        table.setRowSorter(sorter);
        table.setPreferredScrollableViewportSize(new Dimension(500, 70));
        table.setFillsViewportHeight(true);

        //For the purposes of this example, better to have a single
        //selection.
      //  table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

        //When selection changes, provide user with row numbers for
        //both view and model.
     /*   table.getSelectionModel().addListSelectionListener(
                new ListSelectionListener() {
                    public void valueChanged(ListSelectionEvent event) {
                        int viewRow = table.getSelectedRow();
                        if (viewRow < 0) {
                            //Selection got filtered away.
                            statusText.setText("");
                        } else {
                            int modelRow = 
                                table.convertRowIndexToModel(viewRow);
                            statusText.setText(
                                String.format("Selected Row in view: %d. " +
                                    "Selected Row in model: %d.", 
                                    viewRow, modelRow));
                        }
                    }
                }
        );
*/

        //Create the scroll pane and add the table to it.
        JScrollPane scrollPane = new JScrollPane(table);

        //Add the scroll pane to this panel.
        add(scrollPane);

        //Create a separate form for filterText and statusText
        JPanel form = new JPanel(new SpringLayout());
        JLabel l1 = new JLabel("Student Number:", SwingConstants.TRAILING);
        form.add(l1);
        filterText = new JTextField();
        //Whenever filterText changes, invoke newFilter.
        filterText.getDocument().addDocumentListener(
                new DocumentListener() {
                    public void changedUpdate(DocumentEvent e) {
                        newFilter();
                    }
                    public void insertUpdate(DocumentEvent e) {
                        newFilter();
                    }
                    public void removeUpdate(DocumentEvent e) {
                        newFilter();
                    }
                });
        l1.setLabelFor(filterText);
        form.add(filterText);
       /* JLabel l2 = new JLabel("Status:", SwingConstants.TRAILING);
        form.add(l2);
        statusText = new JTextField();
        l2.setLabelFor(statusText);
        form.add(statusText); */ 
        SpringUtilities.makeCompactGrid(form, 2, 2, 6, 6, 6, 6);
        add(form);
    }

当我尝试编译时，我遇到了很多错误，但第一个是：

线程“AWT-EventQueue-0”中的异常java.lang.ArrayIndexOutOfBoundsException：没有这样的孩子：2

Answer 1

不需要评论的块，但随之而来的是SpringUtilities.makeCompactGrid(form, 1, 2, 6, 6, 6, 6);中传递的第二个参数应该从2更改为像我原来的问题一样更改为1，就像它在这里一样。

删除使用SpringLayout创建的文本字段

1 个答案: