在Sun的官方网站上对Editor和Renderer的解释是如下：
Renderer：
Instead, a single cell renderer is generally used to draw all of the cells that contain the same type of data. You can think of the renderer as a configurable ink stamp that the table uses to stamp appropriately formatted data onto each cell. When the user starts to edit a cell's data, a cell editor takes over the cell, controlling the cell's editing behavior.
个人理解就是对于不同的数据显示不同的格式，相当于在MVC中根据不同的Model选择不同的View，Renderer就是给你这个选择的权利。默认的几种数据的显示方式如下：
Boolean — rendered with a check box.
Number — rendered by a right-aligned label.
Double, Float — same as Number, but the object-to-text translation is performed by a NumberFormat instance (using the default number format for the current locale).
Date — rendered by a label, with the object-to-text translation performed by a DateFormat instance (using a short style for the date and time).
ImageIcon, Icon — rendered by a centered label.
Object — rendered by a label that displays the object's string value.
如果你有特殊的数据，想有特殊的显示方式，可以自己设定Cell的Renderer如下：
TableCellRenderer weirdRenderer = new WeirdRenderer();
table = new JTable(...) {
public TableCellRenderer getCellRenderer(int row, int column) {
if ((row == 0) && (column == 0)) {
return weirdRenderer;
}
// else...
return super.getCellRenderer(row, column);
}
};
Editor是用于编辑数据，但是Renderer是用于显示数据。
关于Editor，和Renderer遵守相同的法则
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