java - JTable 中没有标题

Question

Jtable 不显示列标题。我正在使用 vector 来填充 JTable，但它似乎仍然不起作用。这是代码:

public class InsertFileToJtable extends AbstractTableModel{
Vector data;
Vector columns;
private String[] colNames = {"col1","col2","col3","col4","col5","col6","col7","col8"};


public InsertFileToJtable() {
String line;
data = new Vector();
columns = new Vector();
  try {
        FileInputStream fis = new FileInputStream("ProcessList.txt");
        BufferedReader br = new BufferedReader(new InputStreamReader(fis));
        StringTokenizer st1 = new StringTokenizer(br.readLine(), " ");
        while (st1.hasMoreTokens())
                columns.addElement(st1.nextToken());
        while ((line = br.readLine()) != null) {
                StringTokenizer st2 = new StringTokenizer(line, " ");
                while (st2.hasMoreTokens())
                       data.addElement(st2.nextToken());
        }
        br.close();
} catch (Exception e) {
        e.printStackTrace();
}  

}

public int getRowCount() {
return data.size() / getColumnCount();
}

public int getColumnCount() {
return columns.size()-1;
}

public Object getValueAt(int rowIndex, int columnIndex) {
return (String) data.elementAt((rowIndex * getColumnCount())
                + columnIndex);
}
@Override
public String getColumnName(int column) {
return colNames[column];
}
@Override
public Class getColumnClass(int col){
return getValueAt(0,col).getClass();
}
}

下面是从 Main 调用表的方式:

public static void main(String[] args) {
    InsertFileToJtable model = new InsertFileToJtable();
    JTable table = new JTable(model);
    table.setPreferredScrollableViewportSize(new Dimension(500, 70));
    table.setFillsViewportHeight(true);
    table.setModel(model);
    JScrollPane scrollpane = new JScrollPane(table);
    scrollpane.setViewportView(tabbedPane);
    tabbedPane.addTab("Process",null,table,"");
    model.fireTableStructureChanged();
    JPanel panel = new JPanel();
    panel.add(scrollpane);
    frame.add(panel);
    }

因为我是新手，我不知道哪里出了问题。任何帮助将不胜感激。谢谢!

Answer 1

仅当表格位于 JScrollPane 中时，标题才会自动添加。如果它不包含在 scrollPane 中，您将必须手动管理标题。在您的代码中，它最初被添加到 scrollPane，但后来又被删除 - 通过将表格添加到 tabbedPane。可能不是您想要的，而是将 scrollPane 添加到选项卡:

JScrollPane scrollpane = new JScrollPane(table);
//scrollpane.setViewportView(tabbedPane);
tabbedPane.addTab("Process",null,scrollPane,"");