向高人请教JAVA JTable用法.

Question

本人现在用JTable作一个属性框,现在碰到的问题就是一列中要同时加载JCombox和JTextField,现在只能加载其中一个.

Answer 1

//看看下面的例子 希望对你有用。
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableColumn;
import javax.swing.DefaultCellEditor;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.JScrollPane;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.swing.JOptionPane;
import java.awt.*;
import java.awt.event.*;
public class TableRenderDemo extends JFrame {
    private boolean DEBUG = true;
    public TableRenderDemo() {
        super("TableRenderDemo");
        MyTableModel myModel = new MyTableModel();
        JTable table = new JTable(myModel);
        table.setPreferredScrollableViewportSize(new Dimension(500, 70));
        //Create   the   scroll   pane   and   add   the   table   to   it.
        JScrollPane scrollPane = new JScrollPane(table);
        //Set   up   column   sizes.
        initColumnSizes(table, myModel);
        //Fiddle   with   the   Sport   column's   cell   editors/renderers.
        setUpSportColumn(table, table.getColumnModel().getColumn(2));
        //Add   the   scroll   pane   to   this   window.
        getContentPane().add(scrollPane, BorderLayout.CENTER);
        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }
    /*
     *   This   method   picks   good   column   sizes.
     *   If   all   column   heads   are   wider   than   the   column's   cells'
     *   contents,   then   you   can   just   use   column.sizeWidthToFit().
     */
    private void initColumnSizes(JTable table, MyTableModel model) {
        TableColumn column = null;
        Component comp = null;
        int headerWidth = 0;
        int cellWidth = 0;
        Object[] longValues = model.longValues;
        TableCellRenderer headerRenderer =
                table.getTableHeader().getDefaultRenderer();
        for (int i = 0; i < 5; i++) {
            column = table.getColumnModel().getColumn(i);
            comp = headerRenderer.getTableCellRendererComponent(
                    null, column.getHeaderValue(),
                    false, false, 0, 0);
            headerWidth = comp.getPreferredSize().width;
            comp = table.getDefaultRenderer(model.getColumnClass(i)).
                   getTableCellRendererComponent(
                           table, longValues[i],
                           false, false, 0, i);
            cellWidth = comp.getPreferredSize().width;
            if (DEBUG) {
                System.out.println("Initializing   width   of   column   "
                                   + i + ".   "
                                   + "headerWidth   =   " + headerWidth
                                   + ";   cellWidth   =   " + cellWidth);
            }
            //XXX:   Before   Swing   1.1   Beta   2,   use   setMinWidth   instead.
            column.setPreferredWidth(Math.max(headerWidth, cellWidth));
        }
    }

Answer 2

public void setUpSportColumn(JTable table,
                                 TableColumn sportColumn) {
        //Set   up   the   editor   for   the   sport   cells.
        JComboBox comboBox = new JComboBox();
        comboBox.addItem("Snowboarding");
        comboBox.addItem("Rowing");
        comboBox.addItem("Chasing   toddlers");
        comboBox.addItem("Speed   reading");
        comboBox.addItem("Teaching   high   school");
        comboBox.addItem("None");
        sportColumn.setCellEditor(new DefaultCellEditor(comboBox));
        //Set   up   tool   tips   for   the   sport   cells.
        DefaultTableCellRenderer renderer =
                new DefaultTableCellRenderer();
        renderer.setToolTipText("Click   for   combo   box");
        sportColumn.setCellRenderer(renderer);
        //Set   up   tool   tip   for   the   sport   column   header.
        TableCellRenderer headerRenderer = table.getTableHeader().
                                           getDefaultRenderer();
        if (headerRenderer instanceof DefaultTableCellRenderer) {
            ((DefaultTableCellRenderer) headerRenderer).setToolTipText(
                    "Click   the   sport   to   see   a   list   of   choices");
        }
    }
    class MyTableModel extends AbstractTableModel {
        final String[] columnNames = {"First   Name",
                                     "Last   Name",
                                     "Sport",
                                     "#   of   Years",
                                     "Vegetarian"};
        final Object[][] data = { {"Mary", "Campione",
                                "Snowboarding", new Integer(5), new Boolean(false)},
                                {"Alison", "Huml",
                                "Rowing", new Integer(3), new Boolean(true)},
                                {"Kathy", "Walrath",
                                "Chasing   toddlers", new Integer(2),
                                new Boolean(false)}, {"Sharon", "Zakhour",
                                "Speed   reading", new Integer(10), new Boolean(true)},
                                {"Angela", "Lih",
                                "Teaching   high   school", new Integer(4),
                                new Boolean(false)}
        };
        public final Object[] longValues = {"Angela", "Andrews",
                                           "Teaching   high   school",
                                           new Integer(20), Boolean.TRUE};
        public int getColumnCount() {
            return columnNames.length;
        }
        public int getRowCount() {
            return data.length;
        }
        public String getColumnName(int col) {
            return columnNames[col];
        }
        public Object getValueAt(int row, int col) {
            return data[row][col];
        }
        /*
         *   JTable   uses   this   method   to   determine   the   default   renderer/
         *   editor   for   each   cell.     If   we   didn't   implement   this   method,
         *   then   the   last   column   would   contain   text   ("true"/"false"),
         *   rather   than   a   check   box.
         */
        public Class getColumnClass(int c) {
            return getValueAt(0, c).getClass();
        }
        /*
         *   Don't   need   to   implement   this   method   unless   your   table's
         *   editable.
         */
        public boolean isCellEditable(int row, int col) {
            //Note   that   the   data/cell   address   is   constant,
            //no   matter   where   the   cell   appears   onscreen.
            if (col < 2) {
                return false;
            } else {
                return true;
            }
        }
        /*
         *   Don't   need   to   implement   this   method   unless   your   table's
         *   data   can   change.
         */
        public void setValueAt(Object value, int row, int col) {
            if (DEBUG) {
                System.out.println("Setting   value   at   " + row + "," + col
                                   + "   to   " + value
                                   + "   (an   instance   of   "
                                   + value.getClass() + ")");
            }            if (data[0][col] instanceof Integer) {
                //If   we   don't   do   something   like   this,   the   column
                //switches   to   contain   Strings.
                try {
                    data[row][col] = new Integer((String) value);
                    fireTableCellUpdated(row, col);
                } catch (NumberFormatException e) {
                    JOptionPane.showMessageDialog(TableRenderDemo.this,
                                                  "The   \"" +
                                                  getColumnName(col)
                                                  +
                            "\"   column   accepts   only   integer   values.");
                }
            } else {
                data[row][col] = value;
                fireTableCellUpdated(row, col);
            }            if (DEBUG) {
                System.out.println("New   value   of   data:");
                printDebugData();
            }
        }        private void printDebugData() {
            int numRows = getRowCount();
            int numCols = getColumnCount();            for (int i = 0; i < numRows; i++) {
                System.out.print("         row   " + i + ":");
                for (int j = 0; j < numCols; j++) {
                    System.out.print("     " + data[i][j]);
                }
                System.out.println();
            }
            System.out.println("--------------------------");
        }
    }
    public static void main(String[] args) {
        TableRenderDemo frame = new TableRenderDemo();
        frame.pack();
        frame.setVisible(true);
    }
}

Answer 3

wddlqd(快乐的人):谢谢你的例子,这个例子不适合我的需求,一列中要同时加载JCombox和JTextField,这个例子一列只能加载一个控件

Answer 4

If you make the combo box editable, then the combo box includes an editable field into which the user can type a value.

Answer 5

wizardblue(不死鱼)但是如果那样的话,效果不行,不能满足要求!