我正在尝试使用复选框（在JTable的每一行中）中的值来处理数据。但是，当我第二次单击同一行的复选框时，未调用监听器valueChanged方法。
从oracle网站here下载表示例可以很容易地复制它
尝试单击同一行的复选框两次。当我们第二次单击复选框时，控制台日志不会更改。
解决方案：在提供的注释和解决方案的帮助下。使用TableModelListener已达到我的目的。
最佳答案
是的。我曾尝试过使用表模型侦听器，但它的行为方式也相同。
为我工作...
修改了TableSelectionDemo以添加TableModelListener支持
import javax.swing.*;
import javax.swing.table.AbstractTableModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.Dimension;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.TableModel;
public class TableSelectionDemo extends JPanel
implements ActionListener {
private JTable table;
private JCheckBox rowCheck;
private JCheckBox columnCheck;
private JCheckBox cellCheck;
private ButtonGroup buttonGroup;
private JTextArea output;
public TableSelectionDemo() {
super();
setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
TableModel model = new MyTableModel();
model.addTableModelListener(new TableModelListener() {
@Override
public void tableChanged(TableModelEvent e) {
output.append("Table changed");
output.append("\n");
}
});
table = new JTable(model);
table.setPreferredScrollableViewportSize(new Dimension(500, 70));
table.setFillsViewportHeight(true);
table.getSelectionModel().addListSelectionListener(new RowListener());
table.getColumnModel().getSelectionModel().
addListSelectionListener(new ColumnListener());
add(new JScrollPane(table));
add(new JLabel("Selection Mode"));
buttonGroup = new ButtonGroup();
addRadio("Multiple Interval Selection").setSelected(true);
addRadio("Single Selection");
addRadio("Single Interval Selection");
add(new JLabel("Selection Options"));
rowCheck = addCheckBox("Row Selection");
rowCheck.setSelected(true);
columnCheck = addCheckBox("Column Selection");
cellCheck = addCheckBox("Cell Selection");
cellCheck.setEnabled(false);
output = new JTextArea(5, 40);
output.setEditable(false);
add(new JScrollPane(output));
}
private JCheckBox addCheckBox(String text) {
JCheckBox checkBox = new JCheckBox(text);
checkBox.addActionListener(this);
add(checkBox);
return checkBox;
}
private JRadioButton addRadio(String text) {
JRadioButton b = new JRadioButton(text);
b.addActionListener(this);
buttonGroup.add(b);
add(b);
return b;
}
public void actionPerformed(ActionEvent event) {
String command = event.getActionCommand();
//Cell selection is disabled in Multiple Interval Selection
//mode. The enabled state of cellCheck is a convenient flag
//for this status.
if ("Row Selection".equals(command)) {
table.setRowSelectionAllowed(rowCheck.isSelected());
//In MIS mode, column selection allowed must be the
//opposite of row selection allowed.
if (!cellCheck.isEnabled()) {
table.setColumnSelectionAllowed(!rowCheck.isSelected());
}
} else if ("Column Selection".equals(command)) {
table.setColumnSelectionAllowed(columnCheck.isSelected());
//In MIS mode, row selection allowed must be the
//opposite of column selection allowed.
if (!cellCheck.isEnabled()) {
table.setRowSelectionAllowed(!columnCheck.isSelected());
}
} else if (command == "Cell Selection") {
table.setCellSelectionEnabled(cellCheck.isSelected());
} else if (command == "Multiple Interval Selection") {
table.setSelectionMode(
ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
//If cell selection is on, turn it off.
if (cellCheck.isSelected()) {
cellCheck.setSelected(false);
table.setCellSelectionEnabled(false);
}
//And don't let it be turned back on.
cellCheck.setEnabled(false);
} else if ("Single Interval Selection".equals(command)) {
table.setSelectionMode(
ListSelectionModel.SINGLE_INTERVAL_SELECTION);
//Cell selection is ok in this mode.
cellCheck.setEnabled(true);
} else if (command == "Single Selection") {
table.setSelectionMode(
ListSelectionModel.SINGLE_SELECTION);
//Cell selection is ok in this mode.
cellCheck.setEnabled(true);
}
//Update checkboxes to reflect selection mode side effects.
rowCheck.setSelected(table.getRowSelectionAllowed());
columnCheck.setSelected(table.getColumnSelectionAllowed());
if (cellCheck.isEnabled()) {
cellCheck.setSelected(table.getCellSelectionEnabled());
}
}
private void outputSelection() {
output.append(String.format("Lead: %d, %d. ",
table.getSelectionModel().getLeadSelectionIndex(),
table.getColumnModel().getSelectionModel().
getLeadSelectionIndex()));
output.append("Rows:");
for (int c : table.getSelectedRows()) {
output.append(String.format(" %d", c));
}
output.append(". Columns:");
for (int c : table.getSelectedColumns()) {
output.append(String.format(" %d", c));
}
output.append(".\n");
}
private class RowListener implements ListSelectionListener {
public void valueChanged(ListSelectionEvent event) {
if (event.getValueIsAdjusting()) {
return;
}
output.append("ROW SELECTION EVENT. ");
outputSelection();
}
}
private class ColumnListener implements ListSelectionListener {
public void valueChanged(ListSelectionEvent event) {
if (event.getValueIsAdjusting()) {
return;
}
output.append("COLUMN SELECTION EVENT. ");
outputSelection();
}
}
class MyTableModel extends AbstractTableModel {
private String[] columnNames = {"First Name",
"Last Name",
"Sport",
"# of Years",
"Vegetarian"};
private Object[][] data = {
{"Kathy", "Smith",
"Snowboarding", new Integer(5), new Boolean(false)},
{"John", "Doe",
"Rowing", new Integer(3), new Boolean(true)},
{"Sue", "Black",
"Knitting", new Integer(2), new Boolean(false)},
{"Jane", "White",
"Speed reading", new Integer(20), new Boolean(true)},
{"Joe", "Brown",
"Pool", new Integer(10), 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) {
data[row][col] = value;
fireTableCellUpdated(row, col);
}
}
/**
* Create the GUI and show it. For thread safety, this method should be
* invoked from the event-dispatching thread.
*/
private static void createAndShowGUI() {
//Disable boldface controls.
UIManager.put("swing.boldMetal", Boolean.FALSE);
//Create and set up the window.
JFrame frame = new JFrame("TableSelectionDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
TableSelectionDemo newContentPane = new TableSelectionDemo();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}