java类库详细讲解

				
				
				
				Listening for Changes to the Rows and Columns of a JTable Component
				(Java Developers Almanac Example)
				
				
				
				
				
				
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				The Java Developers Almanac 1.4
				
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				    javax.swing.table
				         [62 examples]
				        
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				        Events
				             [4 examples]
				            
				
				  
				    e964.  
				    Listening for Changes to the Rows and Columns of a JTable Component
				
				This example demonstrates how to detect row and columns being added,
				deleted, or changed in a table component.  To listen for these events,
				a listener must be added to the JTable's table model.
				
				Note: When a column is added, the type of the event is UPDATE.
				
				
				
				    
				table.getModel().addTableModelListener(new MyTableModelListener(table));
				    
				    public class MyTableModelListener implements TableModelListener {
				        JTable table;
				    
				        // It is necessary to keep the table since it is not possible
				        // to determine the table from the event's source
				        MyTableModelListener(JTable table) {
				            this.table = table;
				        }
				    
				        public void tableChanged(TableModelEvent e) {
				            int firstRow = e.getFirstRow();
				            int lastRow = e.getLastRow();
				            int mColIndex = e.getColumn();
				    
				            switch (e.getType()) {
				              case TableModelEvent.INSERT:
				                // The inserted rows are in the range [firstRow, lastRow]
				                for (int r=firstRow; r<=lastRow; r++) {
				                    // Row r was inserted
				                }
				                break;
				              case TableModelEvent.UPDATE:
				                if (firstRow == TableModelEvent.HEADER_ROW) {
				                    if (mColIndex == TableModelEvent.ALL_COLUMNS) {
				                        // A column was added
				                    } else {
				                        // Column mColIndex in header changed
				                    }
				                } else {
				                    // The rows in the range [firstRow, lastRow] changed
				                    for (int r=firstRow; r<=lastRow; r++) {
				                        // Row r was changed
				    
				                        if (mColIndex == TableModelEvent.ALL_COLUMNS) {
				                            // All columns in the range of rows have changed
				                        } else {
				                            // Column mColIndex changed
				                        }
				                    }
				                }
				                break;
				              case TableModelEvent.DELETE:
				                // The rows in the range [firstRow, lastRow] changed
				                for (int r=firstRow; r<=lastRow; r++) {
				                    // Row r was deleted
				                }
				                break;
				            }
				        }
				    }
				
				
				
				
				             Related Examples
				        
				
				
				
				
				e963. 
				    Listening for Selection Events in a JTable Component
				
				
				
				e965. 
				    Listening for Column-Related Changes in a JTable Component
				
				
				
				e966. 
				    Listening for Clicks on a Column Header in a JTable Component
				
				
				
				
				
				
				
				
				        See also: 
				
				    Cells
				  
				
				
				    Column Heads
				  
				
				
				    Columns
				  
				
				
				    Editing
				  
				
				
				    Layout
				  
				
				
				    Rows
				  
				
				
				    Scrolling
				  
				
				
				    Selection
				  
				
				
				    Sorting
				  
				
				
				    Table Model
				  
				
				
				    Tool Tips
				  
				
				
				
				
				
				
				
				
				
				© 2002 Addison-Wesley.