JTable& JTextField 用于输入。 JTable 是可更新的。用于 JTextField 的 DocumentListener。事件不会触发。如何获取事件？

Question

import java.awt.*;
import java.awt.Component;
import java.lang.*;
import javax.swing.*;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.event.*;
import javax.swing.text.Document;
import javax.swing.text.*;
import javax.swing.JComponent;
import javax.swing.JTable;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableColumn;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.*;
import java.util.*;

public class Test1 extends JApplet
{

  Object dummya [][] = new Object [9][9];           // Setup 2-Dimensional Arrays

  int inputa [][] = new int [9][9];
  int possiblea [][] = new int [81][9];
  int solveda [][] = new int [9][9];

  String ic = "B";
  String nl = "\n";
  String col_h [] = {"G1", "G2", "G3", "G4", "G5", "G6", "G7", "G8", "G9"};

  Font f = new Font ("Courier", Font.BOLD, 10);
  Font h = new Font ("Times Roman", Font.BOLD, 14);

  JTextField uc = new JTextField (1);
  JTextField st = new JTextField (75);

  int gs = 55;
  int wl = 1;
  int ts = col_h.length;

  DefaultTableModel dm = new DefaultTableModel(dummya, col_h) { // Setup the Table Model
    public String getColumnName (int col) {return col_h[col];}
    public int getColumnCount() {return 9;}         // Setup a 9x9 Table with headers
    public int getRowCount() {return 9;}
    public void setValueAt (Object foundValue, int row, int col) {
//      st.setText ("At setValueAt.");
//      inputa[row][col] = (Integer) foundValue;
      fireTableCellUpdated (row, col);
    }
  };

  JTable table = new JTable (dm);               // Create the Table

  public void init () {
    Container c = getContentPane ();                // Get a Container for User View
    Color lc = new Color (240, 128, 128);           // Set Light Coral Color
    c.setBackground (lc);
    c.setFont (f);

    table.getTableHeader().setResizingAllowed (false);      // Setup all the Table rules
    table.getTableHeader().setReorderingAllowed (false);
    table.setSelectionMode (javax.swing.ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);

    for (int i = 0; i < ts; i++) {              // Resize Columns & Rows to 40 pixels
      TableColumn column = table.getColumnModel().getColumn(i);
      column.setMinWidth (40);
      column.setMaxWidth (40);
      column.setPreferredWidth (40);
      table.setRowHeight (i, 40);
    }
    table.getModel().addTableModelListener (
      new TableModelListener() {
        public void tableChanged(TableModelEvent e) {
          tableDataChanged (e);
        }
    });

    c.setLayout (new FlowLayout (FlowLayout.CENTER, 340, 0));   // Setup a Layout & add Components
    c.add (new JLabel ("                                                     "));
    c.add (new JLabel ("Challenge", SwingConstants.CENTER));
    c.add (new JLabel ("                                                     "));
    c.add (new JLabel ("By  Author X", SwingConstants.CENTER));
    c.add (new JLabel ("                                                     "));   // Add a pad line
    c.setFont (h);
    table.setGridColor (Color.red);             // Setup Table View
    c.add (table.getTableHeader());             // Add Column Headers
    c.add (table);                      // Show the Table
    c.add (new JLabel ("                                                     "));
    uc.setBackground (lc);
    c.add (new JLabel ("  Enter Command (C,F,H,L,I,P,S): ", SwingConstants.CENTER));
    c.add (uc);                         // Add a User Command Field
    uc.setEditable (true);                  // Allow Input in Command Field
    uc.requestFocusInWindow();
    c.add (new JLabel ("                                                     "));
    st.setBackground (lc);
    c.add (st);                         // Add a Status area
    st.setEditable (false);

    uc.getDocument().addDocumentListener (new DocumentListener() {  // Listen for JTextField command
      public void changedUpdate(DocumentEvent e) {
        editInput();
      }
      public void insertUpdate(DocumentEvent e) {
        editInput();
      }
      public void removeUpdate(DocumentEvent e) {}
    });
  }

    // The following section is driven by a user command.
  public void run () {                      // To keep the Applet running, just loop

    int loopcnt = 0;
    while (wl != -1) {
      loopcnt++;
      if (loopcnt == 100) {
        try { Thread.sleep (10000); }               // Sleep for 10 seconds to allow solve
        catch (InterruptedException e) {}           // thread to run.
        loopcnt = 0;
      }
    }
  }


  private void editInput () {                   // Scan user command

    try { ic = uc.getText (0, 1); }             // Pick up user command
    catch (BadLocationException be) { return; }
    st.setText ("  User Input is: " + ic);

    if (ic == "C" || ic == "c") clearComponents ();
      else if (ic == "E" || ic == "e") {
      st.setText ("  User Exit.");
      wl = -1;
    }
    else if (ic == "H" || ic == "h") newFrame();
//    else if (ic == "F" || ic == "f") getHintAtFirst();    // Get a hint where only 2 values possible
//    else if (ic == "L" || ic == "l ") getHintAtLast();
//    else if (ic == "I" || ic == "i") StartThread();       // Look into wait and Notify
//    else if (ic == "P" || ic == "p") printGrid();
//    else if (ic == "S" || ic == "s") solveAndShow();
//      else st.setText ("  Invalid Command, try again.");
  }


  public void clearComponents () {              // Clear Arrarys and Table View

    for (int i = 0; i < ts; i++) {
      for (int j = 0; j < ts; j++) {
        dummya[i][j] = null;
        inputa[i][j] = 0;
        possiblea[i][j] = 0;
        solveda[i][j] = 0;
        table.setValueAt (null, i, j);
      }
    }
    st.setText ("  Table Cleared.");
  }

  private void newFrame () {                    // Setup the Possibles frame
    JFrame possibles = new JFrame ("Grid Possibilities");
    possibles.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
    possibles.setBounds (550, 0, 440, 580);
    JTextArea ta = new JTextArea ();
    JScrollPane sp = new JScrollPane ();
    possibles.add (ta);
    possibles.add (sp);
    possibles.pack ();
    possibles.validate ();
    possibles.setVisible (true);
  }

  public void tableDataChanged (TableModelEvent e) {        // Process & Edit user input
    int row = e.getFirstRow();
    int col = e.getColumn();
//    TableModel model = (TableModel) e.getSource();
//    String cn = model.getColumnName (col);

    for (int i = row; i < ts; i++) {                // Scan the input for values
      for (int j = col; i < ts; j++) {
        dummya [row][col] = table.getValueAt (i, j);
        int newValue = (Integer) dummya [row][col];
        int rc = integerEditor (1, 9, newValue);        // Go check the user input
        if (rc == 0) {
          st.setText ("Input Value is " + newValue);
          inputa [row][col] = (Integer) dummya [row][col];  // Store the grid value
        }

        else st.setText ("Input Value is invalid at " + row+1 + "," + col+1 + ".");
      }
    }
  }

  private int integerEditor (int va, int vb, int value) {   // Edit user input
    if (value < va || value > vb) return -1;
    return 0;
  }
}

Answer 1

DefaultCellEditor dce = (DefaultCellEditor)table.getDefaultEditor(Object.class);
JTextField editor = (JTextField)dce.getComponent();
editor.addDocumentListener(...);