让我们在代码仔细看看...
deleteButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e){
// Don't know why you need to use invokeLater
// The event should be trigged within the EDT if the user
// clicked the button. This may introduce a small "pause"
// depending on what else is in the EDT...
SwingUtilities.invokeLater(new Runnable() {
public void run(){
// Get the indices of the selected rows...okay
int[] selectedRow = jTable.getSelectedRows();
// Loop through the selected rows...good...
for(int j=0; j<selectedRow.length; j++){
// Get the "state" of the row...okay
Boolean state= (Boolean)jTable.getValueAt(selectedRow[j],10);
// Long winded if, but okay...
if(state==true){//deleta the row
// Don't know what's going on here,
// But I assume you are trying to delete
// something from some kind of database
// THIS is likely to chew up some time...
User u=model.getUsers(selectedRow[j]);
new UserDao().delete(u);
// Uh oh...
// If you remove a row from the model, the list of indices you
// have is now invalid, as they no longer point
// to the correct rows in the model
model.remove(selectedRow[j]);
numberField.setText(String.valueOf(model.getRowCount()));
}
}
}
});
}
});
所以。两个问题。
- 您似乎在调用EDT的上下文中调用某种管理功能，“看上去”的功能会导致EDT在很短的时间内放缓/暂停。
- 你是依靠过时的信息...
一个更好的解决办法是使用某种类型的后台进程来执行用户的删除和模型中提供了一种方法来查找User对象本身并将其从模型中移除。这消除了在您下面更改索引的可能性。
A SwingWorker提供了一种方法，我们可以在后台执行操作，关闭事件分派线程，同时在需要时提供重新同步所需操作（如修改表模型）到EDT的手段......
例如...
public class DeleteUsersWorker extends SwingWorker<List<User>, User> {
private UserTableModel model;
private List<User> users;
public DeleteUsersWorker(UserTableModel model, List<User> users) {
this.model = model;
this.users = users;
}
protected List<User> doInBackground() {
UserDao dao = new UserDao();
for (User user : users) {
dao.delete(user);
publish(user);
}
return users;
}
protected void process(List<User> users) {
for (User user : users) {
model.remove(user);
}
}
}
而且actionPerformed方法的内容...
int[] selectedRow = jTable.getSelectedRows();
List<User> usersToBeRemoved = new ArrayList<>(selectedRow.length);
for(int row : selectedRow){
// Is state part of the User object??
Boolean state = (Boolean)jTable.getValueAt(row,10);
if(state){
usersToBeRemoved.add(model.getUsers(row));
}
}
DeleteUsersWorker worker = new DeleteUsersWorker(model, users);
worker.execute();
这可能需要添加一些额外的功能到表模型，以支持从模型中删除User对象，但我没有你的模型，所以很难提出建议...
看看Concurrency in Swing了解更多详情...
一个更好的解决方案可能是在你的dao API上有一个监听器，它可以提供关于更新的通知，这样模型可以更新自身，但是再次，没有足够的上下文来做出决定; ）
以评论形式更新TrashGod
您还应该注意，视图索引并不总是直接映射到模型索引。这是在对表格进行排序或过滤时发生的。虽然你可能会认为你的表没有（排序或过滤），但从来没有做过这样的假设是好的做法......
当从表中取一行索引时，应该调用JTable#convertRowIndexToModel(int)，它会返回索引点在模型
看看Sorting and Filtering了解更多详情...
更新用可运行的示例
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingWorker;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.AbstractTableModel;
public class TableDeleteRowsTest {
public static void main(String[] args) {
new TableDeleteRowsTest();
}
public TableDeleteRowsTest() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
final UserTableModel model = new UserTableModel(
new User("Kermit"),
new User("Fozzie"),
new User("Animal"),
new User("Miss Piggy"),
new User("Gonzo"),
new User("Beaker"),
new User("Crazy Harry"),
new User("Floyd Pepper"),
new User("Sweetums"));
final JTable table = new JTable(model);
JButton delete = new JButton("Delete");
delete.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
int[] selectedRows = table.getSelectedRows();
if (selectedRows.length > 0) {
List<User> users = new ArrayList<>(selectedRows.length);
for (int row : selectedRows) {
int modelRow = table.convertRowIndexToModel(row);
Boolean selected = (Boolean) model.getValueAt(modelRow, 1);
if (selected) {
users.add(model.getUser(modelRow));
}
}
if (users.size() > 0) {
new DeleteUserWorker(users, model).execute();
}
}
}
});
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new JScrollPane(table));
frame.add(delete, BorderLayout.SOUTH);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class DeleteUserWorker extends SwingWorker<List<User>, User> {
private List<User> users;
private UserTableModel model;
public DeleteUserWorker(List<User> users, UserTableModel model) {
this.users = users;
this.model = model;
}
@Override
protected void process(List<User> chunks) {
for (User user : users) {
model.remove(user);
}
}
@Override
protected List<User> doInBackground() throws Exception {
for (User user : users) {
// Simulated delay
Thread.sleep(250);
publish(user);
}
return users;
}
}
public class UserTableModel extends AbstractTableModel {
private List<User> users;
private List<Boolean> selected;
public UserTableModel(User... users) {
this.users = new ArrayList<>(Arrays.asList(users));
selected = new ArrayList<>(this.users.size());
for (User user : this.users) {
selected.add(new Boolean(false));
}
}
public User getUser(int row) {
return users.get(row);
}
@Override
public int getRowCount() {
return users.size();
}
@Override
public int getColumnCount() {
return 2;
}
@Override
public String getColumnName(int column) {
String name = "?";
switch (column) {
case 0:
name = "User";
break;
case 1:
name = "";
break;
}
return name;
}
@Override
public Class getColumnClass(int column) {
Class type = String.class;
switch (column) {
case 0:
type = String.class;
break;
case 1:
type = Boolean.class;
break;
}
return type;
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
Object value = null;
switch (columnIndex) {
case 0:
value = users.get(rowIndex).getName();
break;
case 1:
value = selected.get(rowIndex);
break;
}
return value;
}
@Override
public boolean isCellEditable(int rowIndex, int columnIndex) {
return columnIndex == 1;
}
@Override
public void setValueAt(Object aValue, int rowIndex, int columnIndex) {
switch (columnIndex) {
case 1:
if (aValue instanceof Boolean) {
selected.set(rowIndex, (Boolean) aValue);
fireTableCellUpdated(rowIndex, columnIndex);
}
break;
}
}
public void remove(User user) {
int index = users.indexOf(user);
if (index >= 0) {
selected.remove(index);
users.remove(user);
fireTableRowsDeleted(index, index);
}
}
}
public class User {
private String name;
public User(String name) {
this.name = name;
}
public String getName() {
return name;
}
}
}
与附加示例
上面的例子更新将仅删除被标记和选定的行。要删除所有标记的行，则需要更多的东西一样......
JButton delete = new JButton("Delete");
delete.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
List<User> users = new ArrayList<>(selectedRows.length);
for (int row = 0; row < table.getRowCount(); row++) {
int modelRow = table.convertRowIndexToModel(row);
Boolean selected = (Boolean) model.getValueAt(modelRow, 1);
if (selected) {
users.add(model.getUser(modelRow));
}
}
if (users.size() > 0) {
new DeleteUserWorker(users, model).execute();
}
}
});
如果冻结，将线程转储，看看什么是真正阻止或发生 – Robin
请编辑您的问题包括[SSCCE]（ http://sscce.org/）显示你的模型的remove（）方法。 – trashgod
它冻结略有松动。如果我选择了五个复选框，然后按DEL按钮，只有第一个选择被删除，其他人保持标记。上面的代码中有一些错误吗？如何在eclipse中进行线程转储，如果我没有任何堆栈跟踪？最好的祝愿， – PaulHB