java - 如何用基本表格填充 JScrollPane

Question

我的计划是创建一个“基本”表格模板，每次玩家创建新的播放列表时都会填充 JScrollPane。

Netbeans GUI 编辑器创建如下代码: 私有(private)无效 initComponents() {

    playlistsScrollPane = new javax.swing.JScrollPane();
    playlists = new javax.swing.JList();
    musicFileTableScrollPane = new javax.swing.JScrollPane();
    jTable1 = new javax.swing.JTable();
    jTextField1 = new javax.swing.JTextField();
    NewPlaylistButton = new javax.swing.JButton();
    DeleteSelectedPlaylistButton = new javax.swing.JButton();
    jMenuBar1 = new javax.swing.JMenuBar();
    jMenu1 = new javax.swing.JMenu();
    jMenu2 = new javax.swing.JMenu();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    playlists.setModel(new javax.swing.AbstractListModel() {
        String[] strings = { "Item 1", "Item 2", "Item 3", "Item 4", "Item 5" };
        public int getSize() { return strings.length; }
        public Object getElementAt(int i) { return strings[i]; }
    });
    playlistsScrollPane.setViewportView(playlists);

    jTable1.setModel(new javax.swing.table.DefaultTableModel(
        new Object [][] {
            {null, null, null, null},
            {null, null, null, null},
            {null, null, null, null},
            {null, null, null, null}
        },
        new String [] {
            "Title 1", "Title 2", "Title 3", "Title 4"
        }
    ));
    musicFileTableScrollPane.setViewportView(jTable1);

我有我的模板: 公共(public)类 BasicTableGUI 扩展 JTable {

JTable table;
DefaultTableModel musicTableModel;

public BasicTableGUI() {

    String[] columns = {"Artist", "Title", "Album", "Track Number", "Length"};
    musicTableModel = new DefaultTableModel(columns, 15);
    table = new javax.swing.JTable();

    table.setModel(musicTableModel);

    if (table.isEnabled()) {
        System.out.println("yess");
    } else {
        System.out.println("nsssss");
    }

    table.setTransferHandler(new MusicTableHandler(musicTableModel));
    table.setDragEnabled(true);
    table.setDropMode(javax.swing.DropMode.ON_OR_INSERT_ROWS);
    table.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
    table.setFillsViewportHeight(true);
    table.setVisible(true);

}
}

我尝试从 netbeans 的 GUI 代码中调用它，如下所示:

...


 playlists.setModel(new javax.swing.AbstractListModel() {
    String[] strings = { "Item 1", "Item 2", "Item 3", "Item 4", "Item 5" };
    public int getSize() { return strings.length; }
    public Object getElementAt(int i) { return strings[i]; }
});
playlistsScrollPane.setViewportView(playlists);


musicFileTableScrollPane.setViewportView(newBasicGUI());

我收到此错误:

Exception in thread "AWT-EventQueue-0" java.lang.RuntimeException: 
Uncompilable source code Erroneous sym type: 
javax.swing.JScrollPane.setViewportView

当我想要调用此表"template"BasicGUI 时，正确的方法是什么？我是否正确创建了 BasicGUI 类？

Answer 1

您永远不应该继承 JTable 子类。您应该创建一个扩展 AbstractTableModel 的类并实现数据调用方法。然后代替这个:

jTable1.setModel(new javax.swing.table.DefaultTableModel(
    new Object [][] {
        {null, null, null, null},
        {null, null, null, null},
        {null, null, null, null},
        {null, null, null, null}
    },
    new String [] {
        "Title 1", "Title 2", "Title 3", "Title 4"
    }
));

你会

jTable1.setModel(new MyBasicTableModel());

您的 MyBasicTableModel 类将保存将在表中显示的所有数据。您可能需要添加额外的方法，以便您的程序能够根据需要更新数据。当您获得数据更新时，您还必须通知监听器，以便表格能够直观地更新。

您可以在 http://docs.oracle.com/javase/tutorial/uiswing/components/table.html#data 找到更多信息