Jtable设置单元格为下拉框

Posted 2022-12-03 程序员yqy

public class TableProcessing extends JFrame implements TableModelListener

    public TableProcessing()
    
        super("Table");
        String[] columnNames = "Item", "Quantity", "Price", "Cost";
        Object[][] data =
        
            "Bread", new Integer(1), new Double(1.11), new Double(1.11),
            "Milk", new Integer(1), new Double(2.22), new Double(2.22),
            "Tea", new Integer(1), new Double(3.33), new Double(3.33),
            "Cofee", new Integer(1), new Double(4.44), new Double(4.44)
        ;
 
        DefaultTableModel model = new DefaultTableModel(data, columnNames);
        model.addTableModelListener( this );
 
        JTable table = new JTable( model )
        
            //  Returning the Class of each column will allow different
            //  renderers to be used based on Class
            public Class getColumnClass(int column)
            
                return getValueAt(0, column).getClass();
            
 
            //  The Cost is not editable
            public boolean isCellEditable(int row, int column)
            
                int modelColumn = convertColumnIndexToModel( column );
                return (modelColumn == 3) ? false : true;
            
        ;
        table.setPreferredScrollableViewportSize(table.getPreferredSize());
 
        JScrollPane scrollPane = new JScrollPane( table );
        getContentPane().add( scrollPane );
 
 
        String[] items =  "Bread", "Milk", "Tea", "Coffee" ;
        JComboBox editor = new JComboBox( items );
 
        DefaultCellEditor dce = new DefaultCellEditor( editor );
        table.getColumnModel().getColumn(0).setCellEditor(dce);
    
 
    /*
     *  The cost is recalculated whenever the quantity or price is changed
     */
    public void tableChanged(TableModelEvent e)
    
        if (e.getType() == TableModelEvent.UPDATE)
        
            int row = e.getFirstRow();
            int column = e.getColumn();
 
            if (column == 1 || column == 2)
            
                TableModel model = (TableModel)e.getSource();
                int quantity = ((Integer)model.getValueAt(row, 1)).intValue();
                double price = ((Double)model.getValueAt(row, 2)).doubleValue();
                Double value = new Double(quantity * price);
                model.setValueAt(value, row, 3);
            
        
    
 
    public static void main(String[] args)
    
        TableProcessing frame = new TableProcessing();
        frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
        frame.pack();
        frame.setLocationRelativeTo( null );
        frame.setVisible(true);