在调用replace之后，您不应该使用新的JTable重新初始化表. fireTableDataChanged()方法将提醒您现有的表应重新绘制.发生的情况是，您正在查看放入面板中的表，但是您正在将变量更改为JTable的其他实例.当查询该新的但不可见的表时，它将为您提供-1的所选行数.如果您编辑帖子以显示该代码区域中发生的事情，这可能会有所帮助.

you shouldnt reinitialize your table with a new JTable after you call replace. the fireTableDataChanged() method will alert your existing table that it should repaint. what is happening is that you are looking at the table that you put into the panel, but you are changing the variable to a different instance of JTable. When you query that new, but not visible table, it will give you -1 for the selected row count. it might be helpful if you edit your post to display what is going on in that area of the code.

第二次修改:

代替此:

  if(model==null)
    model = new AchievementTableModel(cells, columns);
  else
    model.replace(cells, columns);
  if(table==null) {
    table = new JTable(model);
    table.setFillsViewportHeight(true);
    table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
    table.getTableHeader().setReorderingAllowed(false);
    table.setSelectionMode(DefaultListSelectionModel.SINGLE_SELECTION);
    table.getColumnModel().setColumnSelectionAllowed(false);
    table.getTableHeader().setResizingAllowed(false);
  } else
    table.setModel(model);

  column = table.getColumn(columns[0]);
  column.setPreferredWidth(25);
  column = table.getColumn(columns[1]);
  column.setPreferredWidth(225);
  column = table.getColumn(columns[2]);
  column.setPreferredWidth(40);
  table.doLayout();

  add(new JScrollPane(table), BorderLayout.CENTER);

改为执行此操作:

 if(model==null) {
    model = new AchievementTableModel(cells, columns);
 } else {
    model.setDataVector(cells, columns);
 }
 if(table==null) {
    table = new JTable(model);
    table.setFillsViewportHeight(true);
    table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
    table.getTableHeader().setReorderingAllowed(false);
    table.setSelectionMode(DefaultListSelectionModel.SINGLE_SELECTION);
    table.getColumnModel().setColumnSelectionAllowed(false);
    table.getTableHeader().setResizingAllowed(false);

    column = table.getColumn(columns[0]);
    column.setPreferredWidth(25);
    column = table.getColumn(columns[1]);
    column.setPreferredWidth(225);
    column = table.getColumn(columns[2]);
    column.setPreferredWidth(40);
    table.doLayout();

    add(new JScrollPane(table), BorderLayout.CENTER);
   } else {
    table.setModel(model);
   }

您无需将表添加到新的滚动窗格中，也无需在每次更改模型时将其重新添加到面板中.

you dont need to add the table to a new scrollpane and re-add it to the panel on each model change.