我正在尝试更新从 ArrayList 中提取数据的 JTable。我的程序中有两个框架。第一帧是一个 JTable (AbstractTableModel)，它显示了 ArrayList 的内容。我单击该框架上的“新建”按钮以显示第二个窗口，它可以让我添加到前面提到的 ArrayList。当我单击“保存”按钮时，第二个窗口关闭，第一个窗口应该用新行刷新。我的代码中没有任何语法错误，而且它在概念上看起来是正确的。我认为开始故障排除的第一个地方是 NoteCntl 类。我的印象是 getNoteTableUI() 应该在调用时使用新数据更新视图，但我对发生的事情感到困惑。我是模型视图控制器概念的新手，但我
这是控制器类：
public class NoteCntl {
private NoteTableModel theNoteTableModel = new NoteTableModel();;
private NoteTableUI theNoteTableUI;
private NoteDetailUI theNoteDetailUI;
public NoteCntl(){
theNoteTableUI = new NoteTableUI(this);
}
public NoteTableModel getNoteTableModel(){
return theNoteTableModel;
}
public void getNoteDetailUI(Note theNote){
if (theNoteDetailUI == null || theNote == null){
theNoteDetailUI = new NoteDetailUI(this,theNote);
}
else{
theNoteDetailUI.setVisible(true);
}
}
public NoteTableUI getNoteTableUI(){
theNoteTableModel.fireTableDataChanged(); //why doesn't this do anything?
theNoteTableUI.setVisible(true);
return theNoteTableUI;
}
public void deleteNote(int noteToDelete){
theNoteTableModel.removeRow(noteToDelete);
}
}
第一个用户界面（表格）：
public class NoteTableUI extends JFrame{
NoteTableModel noteModel;
NoteCntl theNoteCntl;
JPanel buttonPanel;
JPanel tablePanel;
JTable theNoteTable;
JScrollPane theScrollPane;
JButton backButton;
JButton deleteButton;
JButton editButton;
JButton newButton;
public NoteTableUI(NoteCntl theParentNoteCntl){
theNoteCntl = theParentNoteCntl;
this.initComponents();
this.setSize(400, 500);
this.setLocationRelativeTo(null);
this.setTitle("NoteTableUI");
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
}
public void initComponents(){
buttonPanel = new JPanel();
tablePanel = new JPanel();
backButton = new JButton("Back");
newButton = new JButton("New");
newButton.addActionListener(new newButtonListener());
editButton = new JButton("Edit");
deleteButton = new JButton("Delete");
deleteButton.addActionListener(new deleteButtonListener());
noteModel = theNoteCntl.getNoteTableModel();
theNoteTable = new JTable(theNoteCntl.getNoteTableModel());
theScrollPane = new JScrollPane(theNoteTable);
theNoteTable.setFillsViewportHeight(true);
tablePanel.add(theScrollPane);
buttonPanel.add(backButton);
buttonPanel.add(deleteButton);
buttonPanel.add(editButton);
buttonPanel.add(newButton);
this.getContentPane().add(buttonPanel, BorderLayout.NORTH);
this.getContentPane().add(tablePanel, BorderLayout.CENTER);
}
public class deleteButtonListener implements ActionListener{
public void actionPerformed(ActionEvent event){
int selectedRow = theNoteTable.getSelectedRow();
if (selectedRow == -1){
System.out.println("No row selected");
}
else{
noteModel.removeRow(selectedRow);
}
revalidate();
repaint();
}
}
public class newButtonListener implements ActionListener{
public void actionPerformed(ActionEvent event){
NoteTableUI.this.setVisible(false);
NoteTableUI.this.theNoteCntl.getNoteDetailUI(null);
/*
NoteDetailCntl theNoteDetailCntl = new NoteDetailCntl();
lastRow++;
long newRow = lastRow;
noteModel.addRow(newRow, 0, "", "");
revalidate();
repaint();
*/
}
}
第二个 UI（细节编辑器）公共类 NoteDetailUI 扩展 JFrame{
private final int FRAME_WIDTH = 700;
private final int FRAME_HEIGHT = 500;
private final int FIELD_WIDTH = 10;
JButton saveButton;
JButton backButton;
JTextField idField;
JTextField dateField;
JTextField nameField;
JTextField descriptionField;
JTextArea noteDetail;
JLabel idLabel;
JLabel dateLabel;
JLabel nameLabel;
JLabel descriptionLabel;
JPanel buttonPanel;
JPanel textFieldPanel;
JPanel textAreaPanel;
JPanel mainPanel;
NoteTableModel theNoteTableModel;
NoteDetailCntl theNoteDetailCntl;
NoteCntl theNoteCntl;
Note theCurrentNote;
public NoteDetailUI(){
this.initComponents();
this.setSize(FRAME_WIDTH,FRAME_HEIGHT);
this.setLocationRelativeTo(null);
this.setTitle("NoteDetailUI");
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
}
public NoteDetailUI(NoteCntl parentNoteCntl, Note theSelectedNote){
theNoteCntl = parentNoteCntl;
theCurrentNote = theSelectedNote;
this.initComponents();
this.setSize(400,500);
this.setLocationRelativeTo(null);
this.setTitle("Note");
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
}
public void initComponents(){
saveButton = new JButton("Save");
saveButton.addActionListener(new saveButtonListener());
backButton = new JButton("Back");
backButton.addActionListener(new backButtonListener());
idField = new JTextField(FIELD_WIDTH);
theNoteTableModel = new NoteTableModel();
idField.setText("10");
idField.setEditable(false);
dateField = new JTextField(FIELD_WIDTH);
dateField.setText("20131108");
nameField = new JTextField(FIELD_WIDTH);
nameField.setText("Untitled");
descriptionField = new JTextField(FIELD_WIDTH);
descriptionField.setText("not described");
idLabel = new JLabel("ID");
dateLabel = new JLabel("Date");
nameLabel = new JLabel("Name");
descriptionLabel = new JLabel("Description");
noteDetail = new JTextArea(25,60);
buttonPanel = new JPanel();
textFieldPanel = new JPanel();
textAreaPanel = new JPanel();
mainPanel = new JPanel(new BorderLayout());
buttonPanel.add(backButton);
buttonPanel.add(saveButton);
textFieldPanel.add(idLabel);
textFieldPanel.add(idField);
textFieldPanel.add(dateLabel);
textFieldPanel.add(dateField);
textFieldPanel.add(nameLabel);
textFieldPanel.add(nameField);
textFieldPanel.add(descriptionLabel);
textFieldPanel.add(descriptionField);
textAreaPanel.add(noteDetail);
mainPanel.add(buttonPanel, BorderLayout.SOUTH);
mainPanel.add(textFieldPanel, BorderLayout.NORTH);
mainPanel.add(textAreaPanel, BorderLayout.CENTER);
add(mainPanel);
}
public ArrayList<String> getNoteDetails(){
ArrayList<String> newData = new ArrayList<String>();
newData.add(idField.getText());
newData.add(dateField.getText());
newData.add(nameField.getText());
newData.add(descriptionField.getText());
return newData;
}
public class saveButtonListener implements ActionListener{
public void actionPerformed(ActionEvent event){
/*
* Access the noteTableData array in NoteTableModel
* Add the newData fields in order
*/
if(theCurrentNote == null){
int newNoteNumber = Integer.parseInt(NoteDetailUI.this.idField.getText());
int newNoteDate = Integer.parseInt(NoteDetailUI.this.dateField.getText());
String newNoteName = NoteDetailUI.this.nameField.getText();
String newNoteDescription = NoteDetailUI.this.descriptionField.getText();
NoteDetailUI.this.theCurrentNote = new EssayNote(newNoteNumber,newNoteDate,newNoteName,newNoteDescription);
NoteDetailUI.this.setVisible(false);
NoteDetailUI.this.dispose();
NoteDetailUI.this.theNoteCntl.getNoteTableUI();
}
else{
//if it's a current Note
}
//Refresh the JTable
}
}
public class backButtonListener implements ActionListener{
public void actionPerformed(ActionEvent event){
}
}
感谢所有的帮助。如果您只想运行程序并查看发生了什么，我可以提供其他类，但我怀疑这要么是控制器类中的 fireTableDataChanged() 调用的问题，要么是更新 SaveButtonListener 中 ArrayList 的内容的问题。