Question

有关为什么以下代码会显示列标题的任何想法？我曾尝试使用和不使用scollpane。

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 800, 600);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);

JScrollPane scrollpane = new JScrollPane(table);

contentPane.add(scrollpane, "wrap, span");

tableModel = new DefaultTableModel(new Object[]{"Name","Instrument Type","Channel","Number of Channels"},0);



table = new JTable();
table.setBounds(6, 6, 697, 172);
tableModel = new DefaultTableModel(new Object[]{"Fixture Name","Fixture Type","Fixture Channel","Number of Channels"},0);
        table.setModel(tableModel);
        contentPane.add(table);

Answer 1

使用布局管理器
将滚动窗格添加到框架，而不是表格...

您的代码段要么丢失了，要么示例错误。

JScrollPane scrollpane = new JScrollPane(table);

这意味着你已经创建了表格，在这种情况下，你是双重创建它，或者它将生成NullPointerException

您的代码应该更像......

table = new JTable();
tableModel = new DefaultTableModel(new Object[]{"Fixture Name","Fixture Type","Fixture Channel","Number of Channels"},0);
table.setModel(tableModel);
contentPane.add(new JScrollPane(table));

详细了解How to use Tables

Answer 2

tableModel = new DefaultTableModel(new Object[]{"Fixture Name","Fixture Type","Fixture   Channel","Number of Channels"},0);
    table.setModel(tableModel);
    contentPane.add(table); // This is the place that is creating problem for you.

添加时只需将JTable添加到JScrollPane并将滚动窗格添加到容器中，如下所示，

    **contentPane.add(new JScrollPane(table));**

请参阅@Dan帖子why to use a JScrollPane.

列标题未出现在JTable中

2 个答案: