@Override
	public String getToolTipText(MouseEvent e) {
		int row = this.rowAtPoint(e.getPoint());
		int col = this.columnAtPoint(e.getPoint());
		String tiptextString = null;
		if (row > -1 && col > -1) {
			Object value = this.getValueAt(row, col);
			if (null != value && !"".equals(value))
				tiptextString = value.toString();// 悬浮显示单元格内容
		}
		return tiptextString;
	}