我是Java的新手，我有一个菜单文件/退出的swing应用程序，应用程序是一个编辑器，当我从菜单中选择退出选项时，应用程序会询问我是否要在退出前保存更改，请参阅下面的退出代码
class ActionExit extends AbstractAction
{
public ActionExit()
{
super("Exit",Icons.iconExit);
setEnabled(true);
putValue("MENU", "File");
putValue("MENUINDEX", "99");
}
public void actionPerformed(ActionEvent evt)
{
saveandClose(); <----does not execute all the instructions
saveSettings();
System.exit(0);
}
}
我遇到的问题是方法saveandClose（），这里我检查文档是否已更改并显示带有问题/选项的对话框（保存？是，否），我还执行其他连接的方法到数据库并应用我对文档等所做的更改。此方法仅执行第一条指令然后似乎被中断（我放了很多＆＃34; System.out.println＆＃34;来查找方法停止的位置），然后应用程序返回并继续下一个方法并结束。 如果我调试应用程序一切正常，但它运行正常时不起作用。为什么会发生这种情况？，在退出之前，我该怎么做才能使应用程序保存更改？
**这是saveandClose **
的代码基本上我在这里做的是，从主框架我试图找到我要关闭的组件（面板），一旦找到它我执行指令：
（PanelMember）组分[Y]）。closeTab（）
我重复使用此方法，它也在菜单（窗口/关闭面板）中的另一个选项中调用，当我在包含文档的面板中单击并选择＆＃39; X＆＃39;关闭它
public void saveandClose() {
Component[] component =this.getComponents();
for (int y = 0; y < component.length; y++) {
if ((component[y] instanceof Container)) {
saveandClose2((Container)component[y]);
}
}
}
public void saveandClose2(Container pcont) {
Component[] component = pcont.getComponents();
for (int y = 0; y < component.length; y++) {
if ((component[y] instanceof Container)) {
if ((component[y] instanceof PanelMember)) {
((PanelMember)component[y]).closeTab();
}
closeTabsinPanel2((Container)component[y]);
}
}
}
以下是执行的其他程序/方法，谢谢你的帮助
PanleMember.java
public void closeTab()
{
Environment.members.close(projectMember, false);
}
Members.java
public class Members
{
public void close(ProjectMember projectMember, boolean cache)
{
if (Environment.toolManager == null) {
return;
}
if (!projectMember.getMember().isOkToClose()) {
return;
}
Environment.toolManager.close(projectMember, cache);
}
Member.java
public boolean isOkToClose()
{
ListenerMember temp[] = (ListenerMember[])listListeners.toArray(new ListenerMember[listListeners.size()]);
for(int x = 0; x < temp.length; x++)
{
if(!temp[x].isOkToClose(this))
return false;
}
return true;
}
PanelMember.java - 这是我显示对话框以询问用户是否保存更改
public boolean isOkToClose(Member member)
{
if (currentlySaving) {
return false;
}
if (sourceParser.isDirty()) {
int option = JOptionPane.showConfirmDialog(KeyboardFocusManager.getCurrentKeyboardFocusManager().getActiveWindow(), projectMember.getMember().getName() + " has been changed. Would you like to save the Changes?", "Save Changes", 1, 3);
if (option == 2) {
return false;
}
if (option == 0)
{
closeAfterSave = true;
startSave();
return false;
}
}
return true;
}
public void startSave()
{
final String procedureLibrary;
try
{
procedureLibrary = getProcedureLibrary();
}
catch (SQLException e) {
JOptionPane.showMessageDialog(KeyboardFocusManager.getCurrentKeyboardFocusManager().getActiveWindow(), e.getMessage());
e.printStackTrace();
return;
}
if (procedureLibrary == null) {
return;
}
System.out.println("Entering startSave method"); //gs01
selectedTabBeforeSave = jTabbedPane1.getSelectedIndex();
Thread t = new Thread() {
// private final String val$procedureLibrary;
public void run() { setPriority(1);
try {
save(procedureLibrary);
}
catch (Exception e) {
JOptionPane.showMessageDialog(KeyboardFocusManager.getCurrentKeyboardFocusManager().getActiveWindow(), e.getMessage());
e.printStackTrace();
}
}
};
t.start();
}
protected void save(String procedureLibrary)
throws SQLException
{
if (currentlySaving) {
return;
}
currentlySaving = true;
actionMemberSave.setEnabled(false);
SwingUtilities.invokeLater(new Runnable() {
public void run() {
panelLoading.setText("Saving Source.");
jTabbedPane1.insertTab("Status", null, panelStatus, "Status", 0);
jTabbedPane1.setSelectedIndex(0);
jTabbedPane1.setEnabled(false);
}
});
projectMember.member.save(procedureLibrary, sourceParser, this);
currentlySaving = false;
if (closeAfterSave)
Environment.members.close(projectMember, false);
}
Member.java - 这里我放了很多System.out.println来查看进程停止的位置，有时显示的最后一条消息是＆＃34; conection：＆＃34;，有时是＆＃34;同步＆＃ 34;其余部分永远不会显示
public void save(String procedureLibrary, SourceParser parser, ListenerSave listener)
{
System.out.println("Entering save method"); //gs01
saveBulk(parser, listener);
}
public void saveBulk(SourceParser parser, ListenerSave listener)
{
Connection connection;
Statement stmt;
StringBuffer buffer;
String backup;
String append;
int today, date, row;
buffer = new StringBuffer();
backup = null;
append = " ";
row = 1;
System.out.println("Entering saveBulk method"); //gs01
for(SourceLine line = parser.getFirst(); line != null; line = line.getNext())
{
if(line.getText().length() > maxChars + 1)
{
if(listener != null) {
listener.saveComplete(0, false, "Line number: " + row + " is over " + maxChars + " characters.");
}
return;
}
row++;
}
try {
System.out.println("Backup file saved to :" + saveBackup(parser)); //gs01
backup = "Backup file saved to: " + saveBackup(parser);
row = 0;
Calendar cal = Calendar.getInstance();
today = (cal.get(1) - 2000) * 10000;
today += (cal.get(2) + 1) * 100;
today += cal.get(5);
connection = as400system.getConnection(); //sometimes the process stops here
System.out.println("connection :" + connection); //gs01
synchronized(connection)
{
System.out.println("synchronized"); //sometimes the process stops here
as400system.createTempSrcTable(maxChars + 12);
System.out.println("create temp src table "); //gs01
stmt = connection.createStatement();
System.out.println("conection create statement");
for(SourceLine line = parser.getFirst(); line != null; line = line.getNext ())
{
buffer.append(line.getText());
date = line.date;
if(line.changed || line.created) {
date = today;
}
line.changed = false;
line.created = false;
line.date = date;
buffer.append(line.date);
buffer.append("\n");
row++;
if(buffer.length() > 32000)
{
System.out.println("if buffer.length>32000 " ); //gs01
stmt.execute("call qgpl/prcupload('" + buffer.toString().replaceAll("'", "''") + "', '\n', '" + append + "')");
append = "T";
buffer = new StringBuffer();
if(listener != null) {
listener.lineSaved(row);
}
}
}
System.out.println("if buffer.length>0 " ); //gs01
if(buffer.length() > 0 || append.equalsIgnoreCase(" ")) {
System.out.println("call qgpl/prcupload"); //gs01
stmt.execute("call qgpl/prcupload('" + buffer.toString().replaceAll("'", "''") + "', '\n', '" + append + "')");
}
stmt.execute(as400system.buildSqlForCmd("CPYF FROMFILE(QTEMP/SRCUPLOAD) TOFILE(" + library + "/" + file + ") TOMBR(" + member + ") MBROPT(*REPLACE) FMTOPT(*NOCHK)"));
stmt.close();
System.out.println("File copied :" + member); //gs01
}
if(listener != null) {
System.out.println("saveComplete method"); //gs01
listener.saveComplete(row, true, backup);
}
System.out.println("parser setdirty"); //gs01
parser.setDirty(false);
}
catch (Exception e) {
System.out.println("buffer: (" + buffer.toString().replaceAll("'", "''") + ")");
e.printStackTrace();
if(listener != null) {
listener.saveComplete(0, false, e.getMessage() + "\n" + backup);
}
}
System.out.println("nothing"); //gs01
}