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Jon Wingfield

The JTable and TableCellEditor APIs provide methods to do this. You can tell whether the table is still editing by using:

table.isEditing();

You can then decide how to terminate the edit by using one of the following methods from the TableCellEditor API:

TableCellEditor tce = table.getCellEditor();
// either
tce.stopCellEditing();
// or 
tce.cancelCellEditing();