java - TableModel - 图形用户界面中没有显示任何内容？

Question

我正在将数据从 DAO 获取到 GUI 级别。

当我想加载表时，我得到一个空表，仅包含单击的数据库符号的正确行数:

加载我使用的元素:

playlistTable.addMouseListener(new MouseAdapter() {
    public void mouseClicked(MouseEvent e) {
    if (e.getClickCount() == 1) {
        JTable target = (JTable)e.getSource();
        int row = target.getSelectedRow();
        playlistTableModel.setPlaylists(playlistService.getMoviesOfPlaylist(row));
}

为什么表是空的？

更新

表格模型代码:

public class PlaylistTableModel extends AbstractTableModel {

    /**
     * Generated UID
     */
    private static final long serialVersionUID = 9058516120594137393L;


    /**
     * List of playlist to be shown
     */
    private List<Playlist> playlist;

    public PlaylistTableModel(List<Playlist> playlist){
        this.playlist=playlist;
    }

    public int getColumnCount() {
        return 1;
    }

    public int getRowCount() {
        return playlist.size();
    }

    public Object getValueAt(int arg0, int arg1) {
        Playlist playlists = playlist.get(arg0);
        switch(arg1){
        case 0: return playlists.getName();
        default: return null;
        }
    }    

    public void setPlaylists(List<Playlist> playlist){
        this.playlist=playlist;
        fireTableDataChanged();//Aktualisiert Playlist automatisch
    }

    public void setPlaylist(Playlist playlists){
        playlist.add(playlists);
        fireTableRowsInserted(playlist.size()-1, playlist.size()-1);
    }


    public String getColumnName(int column) {
        if(column==0){
            return "Playlist";
        }
        else{
            return null;
        }
    }

    /**
     * Returns a movie from the list specified by the index
     * @param row index of the movie
     * @return movie
     */
    public Playlist getPlaylist(int row){
        return playlist.get(row);
    }

    @Override
    public boolean isCellEditable(int row, int col) {
        return true;
    }

    @Override
    public void setValueAt(Object aValue, int rowIndex, int columnIndex){
        if(columnIndex!=0){
            return;
        }    
        fireTableCellUpdated(rowIndex, columnIndex);
    }

Answer 1

这个方法可能有问题，

public void setPlaylist(Playlist playlists){
    playlist.add(playlists);
    fireTableRowsInserted(playlist.size()-1, playlist.size()-1);
}

例如，如果我们获得大小为 20 的播放列表。然后在分配给您正在调用的表模型播放列表后，

fireTableRowsInserted(playlist.size()-1, playlist.size()-1);

这将减少到，

fireTableRowsInserted(19, 19);

但实际上发生的情况是我们不只是插入一行，而是插入 20 行。正如 @Ivan.Latysh 所建议的在答案部分，您需要从行计数的开始到行计数的末尾调用插入。这将重新绘制插入的行。

P.S:您也可以简单地调用 fireTableDataChanged(); 方法。但此方法将重新绘制整个表。仅当整个表列表发生更改时才首选此方法。否则，您有 Insertion, Update, Delete. 各自的 fireXX 方法