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The getSelectedColumn( ) method returns the index of the first column selected, which will be the only column selected if single-selection mode is being used If no column has been selected, then 1 is returned When multiple selection is enabled (which it is by default), then call getSelectedColumns( ) to obtain a list of the indices of all selected columns If no columns are selected, the array returned will have a length of zero If only one column is selected, then the array will be exactly one element long Thus, you can use getSelectedColumns( ) even when you are using a single-selection mode One fact to keep firmly in mind is that the indices returned by these methods are relative to the view (in other words, the column positions displayed on the screen) Because the columns can be repositioned by the user, these indices might differ from that of the table model, which is fixed To handle cell selection, register listeners for both row and column selection events Then, determine which cell was selected by obtaining both the row and the column index You can listen for changes to the table s data (such as when the user changes the value of a cell) by registering a TableModelListener with the table model The table model is obtained by calling getModel( ) on the JTable instance It is shown here: TableModel getModel( ) TableModel defines the addTableModelListener( ) method, which you use to add a listener for TableModelEvents It is shown here: void addTableModelListener(TableModelListener tml) TableModelListener defines only one method, tableChanged( ) It is shown next: void tableChanged(TableModelEvent tme) This method is called whenever the table model changes, which includes changes to the data, changes to the headers, and insertions or deletions of columns TableModelEvent defines the methods shown here:
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Method int getColumn( ) Description Returns the zero-based index of the column in which the event occurred A return value of TableModelEventALL_COLUMNS means that all columns within the selected row were affected Returns the zero-based index of the first row in which the event occurred If the header changed, the return value is TableModelEventHEADER_ROW Returns the zero-based index of the last row in which the event occurred Returns a value that indicates what type of change occurred It will be one of these values: TableModelEventDELETE, TableModelEventINSERT, or TableModelEventUPDATE
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int getFirstRow( ) int getLastRow( ) int getType( )
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The methods getFirstRow( ), getLastRow( ), and getColumn( ) return the index of the row (or rows) and column that have been changed This same information can be obtained by calling methods defined by JTable (as previously described), but sometimes it is more convenient to obtain it from the event object However, you need to be careful because getColumn( ) returns the column index as maintained by the table model If the user rearranges the columns, then it will differ from the column index returned by a method such as JTable s getSelectedColumn( ), which reflects the position of the columns in the current view Therefore, don t mix the two indices
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Also notice getType( ) It returns a value that indicates what type of change has taken place The possible return values, defined by TableModelEvent, are shown here:
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DELETE INSERT UPDATE A row or column has been removed A row or column has been added Cell data has changed
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Often, if cell data has been changed, your application will need to update the underlying data source to reflect this change Thus, if your table allows cell editing, watching for UPDATE table model events is especially important When data inside a cell changes, you can obtain the new value by calling getValueAt( ) on the model instance It is shown here: Object getValueAt(int row, int column) Here, row and column specify the coordinates of the cell that changed
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