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str = "Selected Row(s): "; // Get a list of all selected rows int[] rows = jtabOrdersgetSelectedRows(); // Create a string that contains the indices of the selected rows for(int i=0; i < rowslength; i++) str += rows[i] + " "; } else if(jrbColumnsisSelected()) { str = "Selected Column(s): "; // Get a list of all selected columns int[] cols = jtabOrdersgetSelectedColumns(); // Create a string that contains the indices of the selected columns for(int i=0; i < colslength; i++) str += cols[i] + " "; } else { str = "Selected Cell: (View Relative) " + jtabOrdersgetSelectedRow() + ", " + jtabOrdersgetSelectedColumn(); } // Display the indices jlabsetText(str); } public static void main(String args[]) { // Create the frame on the event dispatching thread SwingUtilitiesinvokeLater(new Runnable() { public void run() { new TableEventDemo(); } }); } }
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Because the order of the columns displayed on the screen can change, such as when the user drags a column to a new location, the column index returned by methods such as getSelectedColumn( ) or getSelectedColumns( ) may differ from the index used by the model This may be an issue in cases in which you want to use the index to access the data in the model To handle this situation, JTable supplies the convertColumnIndexToModel( ) method It is shown here: int convertColumnIndexToModel(int viewIdx) It returns the model index of the column that corresponds to the view index passed in viewIdx You can also perform the reverse operation, converting a model column index into a view index, by calling convertColumnIndexToView( ) It is shown here: int convertColumnIndexToView(int modelIdx) It returns the view index of the column that corresponds to the model index passed in modelIdx For example, in the preceding example, you can display the model indexes rather than the view indexes of the selected columns by substituting this sequence in the portion of the valueChanged( ) method that displays column selections:
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// Create a string that contains the model-relative indices of the selected columns for(int i=0; i < colslength; i++) str += jtabOrdersconvertColumnIndexToModel(cols[i]) + " ";
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Begining with Java 6 it is easy to allow the user to sort the data in a table based on the entries in a column Sorting results in a rearrangement of the rows, which can result in the index of any given row in the view being different than its index in the model Because of this, Java 6 added the methods convertRowIndexToModel( ) and convertRowIndexToView( ) They work like their column-oriented counterparts To enable the user to sort data, you must set the row sorter by calling setRowSorter( ) This method was added by Java 6 and is shown here: void setRowSorter(RowSorter< extends TableModel> rowSorter) The row sorter is specified by rowSorter, which is an instance of the RowSorter class For the sorting of rows in a JTable, this can be an instance of javaxswingtableTableRowSorter For example, to enable sorting for the jtabOrders table used by the example, add this line:
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jtabOrderssetRowSorter(new TableRowSorter<TableModel>(tm));
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After making this change, the rows can be sorted by column entries by simply clicking on the desired column heading You can set the data in a cell under program control by calling setValueAt( ) on the table model It is shown here: void setValueAt(Object val, int row, int column) It sets the value of the cell located at row and column to the val For both methods, the values of row and column are relative to the model, not the view
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Classes and Interfaces javaxswingJTree Methods void addTreeExpansionListener( TreeExpansionListener tel) void addTreeSelectionListener( TreeSelectionListener tsl) TreeModel getModel( ) TreeSelectionModel getSelectionModel( ) void setEditable(boolean on) void add(MutableTreeNode child) void addTreeModelListener( TreeModelListener tml) TreePath getPath( ) void treeCollapsed( TreeExpansionEvent tee) void treeExpanded( TreeExpansionEvent tee) Object[ ] getChildren( ) TreePath getTreePath( ) void treeNodesChanged( TreeModelEvent tme) void treeStructureChanged( TreeModelEvent tme) void treeNodesInserted( TreeModelEvent tme) void treeNodesRemoved( TreeModelEvent tme) Object getLastPathComponent( ) Object[ ] getPath( ) TreePath getPath( ) void valueChanged( TreeSelectionEvent tse) void setSelectionMode(int how)
javaxswingtreeDefaultMutableTreeNode javaxswingtreeTreeModel javaxswingtreeTreeExpansionEvent javaxswingtreeTreeExpansionListener
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