The user-interface works as follows:
The user can select a column by pressing the left or right arrow keys to move to the desired column, and then pressing ENTER.
He/she can select a row by pressing the up and down arrow keys to move to the desired row, then pressing ENTER.
Depending on the value of the selection mode, multiple rows and/or columns may be selected. By default the selection mode is set to SINGLE_SELECTION so that only a single row or column can be selected at a time. Selection of rows and/or columns can be enabled/disabled by means of the setRowSelectionAllowed() and setColumnSelectionAllowed() methods.
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