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Now, you learn how to alter the
appearance of cells. The JTable machinery obtains the
cell renderer by calling getTableCellRenderer. Then, machinery defined
in the JTable class displays each cell by displaying a component
produced by a cell renderer using the data associated with the cell.
Display
^
| Modified instance
|
*-----------------* getTableCellRenderer *-- | -------------------*
| | ----------------------> | | Renderer instance |
| JTable instance | | | |
| | | *--------------------* |
| | | | Component instance | |
| | | *--------------------* |
| | *-- ^ -------------------*
| | |
| | | Data instance
| | getModel *------------------------*
| | ----------------------> | Table model instance |
*-----------------* *------------------------*
Fundamentally, the cell renderer uses cell data to modify a component held
by the renderer; then, the modified component is returned by the cell
renderer for display. Because the Component class defines a
paint method, the JTable machinery simply calls the
paint method using the returned component as the target.