在JTable单元中显示时间计数器的一种有效方法

您需要的是:

下面是表格模型的一些伪代码:

public Object getValueAt (int rowIndex, int columnIndex) {

    // if it's the column with the 'row age', calculate the age and return it
    long rowAgeMs = System.currentTimeMs() - getCreationTime(rowIndex);

   // return the age in milliseconds, or a date, or a formatted time string 
}

公共类MyTableModel实现TableModel{

   private final List<TableModelListener> listeners = new LinkedList<TableModelListener>();

   public void addTableModelListener (TableModelListener l) {
          listeners.add(l);
   }

   public void removeTableModelListener (TableModelListener l) {
          listeners.remove(l);
   }

   public void updateColumn (int column) {
          TableModelEvent evt = new TableModelEvent(this, 0, Math.max(0, getRowCount() - 1), column);
          for (TableModelListener listener : listeners) {
                 listener.tableChanged(evt);
          }
   }

Thread rowAgeUpdater = new Thread() {

        @Override
        public void run () {
            while (isAlive()) {
                try {

                    long time = System.currentTimeMillis();
                    long sleepTime = (time / 1000 + 1) * 1000 - time;
                    Thread.sleep(sleepTime);

                    SwingUtilities.invokeAndWait(new Runnable() {
                        public void run () {
                            model.updateColumn(ROW_AGE_COLUMN_INDEX);
                        }
                    });

                } catch (Exception e) {
                    return;
                }

            }
        }
    };
    rowAgeUpdater.setDaemon(true);
    rowAgeUpdater.setPriority(Thread.MIN_PRIORITY);
    rowAgeUpdater.start();

只要TableModelEvent的粒度只包含需要更新的单元格(在您的情况下:仅包含行龄的列),它就是实现这一点的最有效方法。