JTabbedPane中的选项卡不会反映按下按钮时的更改

在我的GUI的选项卡中，允许用户编辑员工的姓名。 该名称还用作选项卡的标签，因此在确认更改时，应更新选项卡以反映此更改，并将新数据写入数据文件。

员工存储在Employees类的HashMap中。 通过迭代员工姓名的ArrayList来填充选项卡，这是通过调用方法Employees.getNames() 。 在GUI中，用户可以键入新名称，然后按更改名称按钮。 按钮的ActionListener调用方法changeName() ，该方法用HashMap的新名称替换旧名称并更新数据文件。

这在用户第一次想要更改员工姓名时正常工作，但后续更改会产生错误。 看来包含JTextFields的JPanel （参见下面的getEmployeeInfoPanel() ）没有更新参数name 。 此参数是员工的当前名称，而新名称是从JTextField 。

下面说明这个问题的一个例子。 基本上，步骤是：

 1. old name = Mary is provided when the program starts 2. User changes name in JTextField, so oldName = Mary and newName = Mary S. 3. At this point, oldName should update to Mary S. as it is the new key. However, oldName remains as Mary so the HashMap cannot be updated again. 

此特定屏幕的层次结构为：

 JFrame (entire application) | -- JPanel EmployeesPanel (this screen) | | | -- JPanel (for custom menu bar) | | | -- JTabbedPane (one tab for each employee) | | | -- JPanel (contains JLabels, JTextField, etc for this employee) | -- ..... 

以下是GUI的相关代码：

 public class EmployeesPanel { private JTabbedPane pane; private Employees employees; ... public EmployeesPanel(JPanel panel, Container cards) { ... pane = new JTabbedPane(); getEmployees(); } private void getEmployees() { ... employees = new Employees(properties, EMPLOYEES_TXT); //ArrayList of all employees' names names = employees.getNames(); for(String name : names) { pane.addTab(name, getEmployeeInfoPanel(name)); } pane.addTab("NEW EMPLOYEE", addEmployeePanel()); } public JPanel addEmployeePanel() { ... } private JPanel getEmployeeInfoPanel(final String name) throws EmployeeException { JPanel infoPanel = new JPanel(); infoPanel.setLayout(new BoxLayout(infoPanel, BoxLayout.PAGE_AXIS)); JLabel nameLabel = new JLabel("Employee name"); JLabel wageLabel = new JLabel("Employee wage"); final JTextField nameField = new JTextField(name, 30); final JTextField wageField = new JTextField(employees.getWage(name).toString(), 30); JButton changeNameButton = new JButton("CHANGE NAME"); JButton changeWageButton = new JButton("CHANGE WAGE"); changeNameButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { try { String newName = nameField.getText(); employees.changeName(name, newName); panel.validate(); } catch (EmployeeException e) { // TODO create popup warning } } }); ... return infoPanel; } } 

这是更改HashMap的Employees类中的代码：

 public void changeName(String oldName, String newName) throws EmployeeException { System.out.println("old name = " + oldName + ", new name = " + newName); if(employees.containsKey(oldName)) { BigDecimal wage = employees.get(oldName); employees.remove(oldName); employees.put(newName, wage); names.remove(oldName); names.add(newName); prop.remove(oldName); prop.setProperty(newName, wage.toString()); saveProperties(); System.out.println(names); } else { throw new EmployeeException("Could not change name because employee does not exist."); } } 

这是一个例子。 第一个屏幕截图是从程序启动时开始; 员工姓名将填充到相应的选项卡中。 第二个屏幕截图是在尝试更改员工姓名后。 正如您所看到的，选项卡的标签没有改变，我假设调用validate()会这样做。

（之前）

（按下按钮后）

最后，按下更改名称按钮两次的输出生成，显示名称已在ArrayList中更改：

 old name = Mary, new name = Mary S. [Jane, Bob, Sue, Mary S.] old name = Mary, new name = Mary S. 653647 [AWT-EventQueue-0] ERROR employees.EmployeeException - Could not change name because employee does not exist. 

Answer 1

您可能正在寻找setTitleAt()方法。

附录：为了进行比较，这是一个允许多次编辑的sscce 。

 import java.awt.Dimension; import java.awt.EventQueue; import java.awt.event.ActionEvent; import javax.swing.AbstractAction; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTabbedPane; import javax.swing.JTextField; /** * @see http://stackoverflow.com/a/11007109/230513 */ public class TabEdit extends JPanel { private static final int MAX = 5; private static final String NAME = "Tab "; private final JTabbedPane pane = new JTabbedPane(); public TabEdit() { for (int i = 0; i < MAX; i++) { pane.add(NAME + String.valueOf(i), new TabContent(i)); } this.add(pane); } private class TabContent extends JPanel { private TabContent(final int i) { final JTextField jtf = new JTextField( "Please edit the name of " + NAME + String.valueOf(i)); this.add(jtf); jtf.addActionListener(new AbstractAction() { @Override public void actionPerformed(ActionEvent e) { pane.setTitleAt(i, jtf.getText()); } }); } @Override public Dimension getPreferredSize() { return new Dimension(320, 120); } } private void display() { JFrame f = new JFrame("TabEdit"); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.add(this); f.pack(); f.setLocationRelativeTo(null); f.setVisible(true); } public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { @Override public void run() { new TabEdit().display(); } }); } }