JTable排序在顶部上升空单元格

Question

当我点击列标题以按升序排序时，如何在JTable中的空单元格显示在具有值的单元格下方。现在，空单元格出现在单元格上方，其中包含数字1和2。

TableRowSorter<TableModel> tableRowSorter = new TableRowSorter<TableModel>(spreadsheetModel)
{
    Comparator<Object> comparator = new Comparator<Object>()  
    {  
        public int compare(Object o1, Object o2) 
        {  
            try
            {           
                Double d1 = Double.parseDouble(o1.toString());  
                Double d2 = Double.parseDouble(o2.toString());  
                return d1.compareTo(d2);  
            } 
            catch (NumberFormatException numberFormatException) 
            {  
                try 
                {  
                    Integer i1 = Integer.parseInt(o1.toString());  
                    Integer i2 = Integer.parseInt(o2.toString());  
                    return i1.compareTo(i2);  
                } 
                catch (Exception e) 
                {  
                    return o1.toString().compareTo(o2.toString());  
                }  
            }


        }  
    };

    public Comparator getComparator(int column)  
    {  
        return comparator;  
    };  
};                      

for(int i = 0; i < table.getColumnCount(); i++)
    tableRowSorter.setComparator(i, tableRowSorter.getComparator(i));

tableRowSorter.setSortKeys(null);
table.setRowSorter(tableRowSorter);
table.setAutoCreateRowSorter(false);

Answer 1

在进行比较之前，您可以检查空值。类似的东西：

// Handle sorting of null values

if (o1 == null && o2 == null) return 0;

if (o1 == null) return 1;

if (o2 == null) return -1;