请教高手：JTable中默认的是不是都是可编辑的？为什么我的是不可编辑呢？

Question

继承defaultmodel，就是默认可以编辑的，而且也能保存，我现在回车都不行

Answer 1

我想你肯定是用到自己的editor或renderer了吧？

Answer 2

如果不是就检查model里的setValueAt这个方法。

Answer 3

看一看这个例子吧(From sun.java.com)import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;public class TableTest extends JFrame{
   public TableTest(){
      setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
String[] columnNames={"First Name","Last Name","sport","# of Years","Vegetarian"};
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(20), new Boolean(true)},
            {"Angela", "Lih","Teaching high school", new Integer(4), new Boolean(false)}
};
final JTable table=new JTable(data,columnNames);
table.setPreferredScrollableViewportSize(new Dimension(500,300));

JScrollPane scrollpane=new JScrollPane(table);
getContentPane().add(scrollpane,BorderLayout.CENTER);

table.setModel(new MyTableModel());
//Selection Model
table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
ListSelectionModel rowModel=table.getSelectionModel();
rowModel.addListSelectionListener(new ListSelectionListener(){
   public void valueChanged(ListSelectionEvent e){
      if (e.getValueIsAdjusting()) return;
      ListSelectionModel model=(ListSelectionModel)e.getSource();
      if (model.isSelectionEmpty())
         System.out.println("select no row!");
      else{
       int row=model.getMinSelectionIndex();
       System.out.println("row "+row+" is selected");
      
      }   
   }
});
   }
  // inner class
  
  
      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(20), new Boolean(true)},
            {"Angela", "Lih",
             "Teaching high school", new Integer(4), new Boolean(false)}
        };        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) {
                System.out.println("Setting value at " + row + "," + col
                                   + " to " + value
                                   + " (an instance of "
                                   + value.getClass() + ")");            if (data[0][col] instanceof Integer
                    && !(value instanceof Integer)) {
                try {
                    data[row][col] = new Integer(value.toString());
                    fireTableCellUpdated(row, col);
                } catch (NumberFormatException e) {
                    JOptionPane.showMessageDialog(TableTest.this,
                        "The \"" + getColumnName(col)
                        + "\" column accepts only integer values.");
                }
            } else {
                data[row][col] = value;
                fireTableCellUpdated(row, col);
            }           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("--------------------------");
        }
    }   //inner class end   
   public static void main(String[] args){
        TableTest test=new TableTest();
        test.setLocation(20,150);
        test.pack();
        test.setVisible(true);
    }
}

Answer 4

现在好了，原来是我覆盖了getvalueat（）方法，导致不对了，现在好了
不过如果用paramSetTable.setSelectionMode(
                           ListSelectionModel.SINGLE_SELECTION);
来设置单选的话，又不能保存编辑值了