我有一个具有JTabbedPane组件的JFrame。 JTabbedPane中的选项卡数量取决于先前确定的用户数据。 TabbedPane中的每个选项卡都是由JPanel扩展的实例。每个JPanel都有一个JList和几个按钮。如何编辑特定的JList？ 我如何创建标签：
for (String s : variables.focusedHostnames) {
clusterTab cluster = new clusterTab();
tabbedPaneClusters.addTab(s, cluster);
}
http://justpaste.it/maxv - 完整的类，名为clusterEndusersGui
http://justpaste.it/maxw - 这是clusterTab类，用于创建选项卡
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
// !! import assets.variables;
@SuppressWarnings("serial")
public class clusterEndusersGui extends JFrame {
// !! I (hovercraft) added this so that the code runs
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
clusterEndusersGui gui = new clusterEndusersGui();
gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
gui.pack();
gui.setLocationRelativeTo(null);
gui.setVisible(true);
}
});
}
public clusterEndusersGui() {
initComponents();
}
private void initComponents() {
panelQuery = new JPanel();
labelWhere = new JLabel();
comboBoxDataType = new JComboBox<>();
comboBoxDataParameter = new JComboBox<>();
fieldQueryData = new JTextField();
btnFindUsers = new JButton();
tabbedPaneClusters = new JTabbedPane();
panel4 = new JPanel();
listScrollPane = new JScrollPane();
list1 = new JList();
btnRemoveAll = new JButton();
btnAddAll = new JButton();
btnRemoveFromAll = new JButton();
panel5 = new JPanel();
btnApplyUpdates = new JButton();
btnBackToConn = new JButton();
// ======== this ========
Container contentPane = getContentPane();
// ======== panelQuery ========
{
panelQuery.setBorder(new TitledBorder("Find Users Query"));
// ---- labelWhere ----
labelWhere.setText("Where");
// ---- comboBoxDataType ----
comboBoxDataType.setModel(new DefaultComboBoxModel<>(
new String[] { "User ID" }));
// ---- comboBoxDataParameter ----
comboBoxDataParameter.setModel(new DefaultComboBoxModel<>(
new String[] { "Equals" }));
// ---- btnFindUsers ----
btnFindUsers.setText("Find Users");
GroupLayout panelQueryLayout = new GroupLayout(panelQuery);
panelQuery.setLayout(panelQueryLayout);
panelQueryLayout.setHorizontalGroup(panelQueryLayout
.createParallelGroup().addGroup(
panelQueryLayout
.createSequentialGroup()
.addContainerGap()
.addComponent(labelWhere)
.addGap(18, 18, 18)
.addComponent(comboBoxDataType,
GroupLayout.PREFERRED_SIZE,
GroupLayout.DEFAULT_SIZE,
GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(comboBoxDataParameter,
GroupLayout.PREFERRED_SIZE,
GroupLayout.DEFAULT_SIZE,
GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(fieldQueryData,
GroupLayout.PREFERRED_SIZE, 200,
GroupLayout.PREFERRED_SIZE)
.addPreferredGap(
LayoutStyle.ComponentPlacement.RELATED,
GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(btnFindUsers).addContainerGap()));
panelQueryLayout.setVerticalGroup(panelQueryLayout
.createParallelGroup().addGroup(
panelQueryLayout
.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(labelWhere)
.addComponent(comboBoxDataType,
GroupLayout.PREFERRED_SIZE,
GroupLayout.DEFAULT_SIZE,
GroupLayout.PREFERRED_SIZE)
.addComponent(comboBoxDataParameter,
GroupLayout.PREFERRED_SIZE,
GroupLayout.DEFAULT_SIZE,
GroupLayout.PREFERRED_SIZE)
.addComponent(fieldQueryData,
GroupLayout.PREFERRED_SIZE,
GroupLayout.DEFAULT_SIZE,
GroupLayout.PREFERRED_SIZE)
.addComponent(btnFindUsers)));
}
// ======== tabbedPaneClusters ========
{
// ======== panel4 ========
for (String s : variables.focusedHostnames) {
clusterTab cluster = new clusterTab();
tabbedPaneClusters.addTab(s, cluster);
}
}
// ---- btnApplyUpdates ----
btnApplyUpdates.setText("Apply all End User Updates");
// ---- btnBackToConn ----
btnBackToConn.setText("<< Go back to Cluster Connections");
GroupLayout contentPaneLayout = new GroupLayout(contentPane);
contentPane.setLayout(contentPaneLayout);
contentPaneLayout
.setHorizontalGroup(contentPaneLayout
.createParallelGroup()
.addGroup(
contentPaneLayout
.createSequentialGroup()
.addContainerGap()
.addGroup(
contentPaneLayout
.createParallelGroup()
.addGroup(
contentPaneLayout
.createSequentialGroup()
.addComponent(
tabbedPaneClusters)
.addContainerGap())
.addGroup(
GroupLayout.Alignment.TRAILING,
contentPaneLayout
.createSequentialGroup()
.addGap(0, 0,
Short.MAX_VALUE)
.addComponent(
panelQuery,
GroupLayout.PREFERRED_SIZE,
GroupLayout.DEFAULT_SIZE,
GroupLayout.PREFERRED_SIZE)
.addGap(98, 98, 98))
.addGroup(
GroupLayout.Alignment.TRAILING,
contentPaneLayout
.createSequentialGroup()
.addComponent(
btnBackToConn)
.addPreferredGap(
LayoutStyle.ComponentPlacement.RELATED,
GroupLayout.DEFAULT_SIZE,
Short.MAX_VALUE)
.addComponent(
btnApplyUpdates)
.addContainerGap()))));
contentPaneLayout
.setVerticalGroup(contentPaneLayout.createParallelGroup()
.addGroup(
contentPaneLayout
.createSequentialGroup()
.addGap(11, 11, 11)
.addComponent(panelQuery,
GroupLayout.PREFERRED_SIZE, 51,
GroupLayout.PREFERRED_SIZE)
.addPreferredGap(
LayoutStyle.ComponentPlacement.RELATED)
.addComponent(tabbedPaneClusters,
GroupLayout.PREFERRED_SIZE, 390,
GroupLayout.PREFERRED_SIZE)
.addPreferredGap(
LayoutStyle.ComponentPlacement.RELATED)
.addGroup(
contentPaneLayout
.createParallelGroup(
GroupLayout.Alignment.BASELINE)
.addComponent(btnApplyUpdates)
.addComponent(btnBackToConn))
.addContainerGap(15, Short.MAX_VALUE)));
pack();
setLocationRelativeTo(getOwner());
}
public static void printTabNames() {
System.out.println("Tab Name: " + tabbedPaneClusters.getTitleAt(0));
}
private JPanel panelQuery;
private JLabel labelWhere;
private JComboBox<String> comboBoxDataType;
private JComboBox<String> comboBoxDataParameter;
private JTextField fieldQueryData;
private JButton btnFindUsers;
private static JTabbedPane tabbedPaneClusters;
private JPanel panel4;
private JScrollPane listScrollPane;
private JList list1;
private JButton btnRemoveAll;
private JButton btnAddAll;
private JButton btnRemoveFromAll;
private JPanel panel5;
private JButton btnApplyUpdates;
private JButton btnBackToConn;
}
class clusterTab extends JPanel {
public clusterTab() {
initComponents();
}
public void getUsers(ActionEvent e) {
clusterEndusersGui.printTabNames();
}
private void initComponents() {
final JScrollPane listScrollPane;
final JList list1;
final JButton btnRemoveAll;
final JButton btnAddAll;
final JButton btnRemoveFromAll;
final DefaultListModel listItems;
listScrollPane = new JScrollPane();
list1 = new JList();
btnRemoveAll = new JButton();
btnAddAll = new JButton();
btnRemoveFromAll = new JButton();
listItems = new DefaultListModel();
listItems.addElement("Test");
// ======== panel4 ========
{
// List
{
list1.setModel(listItems);
}
// ======== listScrollPane ========
{
listScrollPane.setViewportView(list1);
}
// ---- btnRemoveAll ----
btnRemoveAll.setText("Remove all from Cluster");
btnRemoveAll
.setToolTipText("Remove all selected End Users from this Cluster");
// ---- btnAddAll ----
btnAddAll.setText("Add all to Cluster");
btnAddAll
.setToolTipText("Update All End Users, set their Home Cluster to this one");
btnAddAll.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
getUsers(e);
}
});
// ---- btnRemoveFromAll ----
btnRemoveFromAll.setText("Remove from All Clusters");
btnRemoveFromAll
.setToolTipText("Remove selected user from all Clusters except this one");
GroupLayout panel4Layout = new GroupLayout(this);
this.setLayout(panel4Layout);
panel4Layout.setHorizontalGroup(panel4Layout.createParallelGroup()
.addGroup(
panel4Layout
.createSequentialGroup()
.addContainerGap()
.addComponent(listScrollPane,
GroupLayout.PREFERRED_SIZE, 378,
GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addGroup(
panel4Layout
.createParallelGroup(
GroupLayout.Alignment.LEADING,
false)
.addComponent(btnRemoveAll,
GroupLayout.DEFAULT_SIZE,
GroupLayout.DEFAULT_SIZE,
Short.MAX_VALUE)
.addComponent(btnAddAll,
GroupLayout.DEFAULT_SIZE,
GroupLayout.DEFAULT_SIZE,
Short.MAX_VALUE)
.addComponent(btnRemoveFromAll,
GroupLayout.DEFAULT_SIZE,
GroupLayout.DEFAULT_SIZE,
Short.MAX_VALUE))
.addContainerGap(187, Short.MAX_VALUE)));
panel4Layout.setVerticalGroup(panel4Layout.createParallelGroup()
.addGroup(
panel4Layout
.createSequentialGroup()
.addContainerGap()
.addGroup(
panel4Layout
.createParallelGroup()
.addGroup(
panel4Layout
.createSequentialGroup()
.addComponent(btnRemoveAll)
.addGap(18, 18, 18)
.addComponent(btnAddAll)
.addGap(18, 18, 18)
.addComponent(
btnRemoveFromAll)
.addGap(0, 0,
Short.MAX_VALUE))
.addComponent(listScrollPane,
GroupLayout.DEFAULT_SIZE, 304,
Short.MAX_VALUE))
.addContainerGap()));
}
}
}
// !! A dummy class that I (hovercraft) created just so I could get your code to work
class variables {
public static String[] focusedHostnames = { "1", "2", "3", "4", "5", "6",
"7" };
}
答案 0 :(得分：3)
这个问题与“如何从多个对象中引用一个对象”这个更一般的问题没什么不同，一个好的解决方案是把你的对象，这里的JPanel“视图”放到一个集合中，比如作为ArrayList，如果希望通过索引检索项目，或者如果希望通过非数字对象键（如String）检索项目，则可以使用HashMap。他们所说的魔鬼就是细节。与大多数GUI工作一样，您应该努力将程序的逻辑（模型）与GUI显示或视图分开，这也可以帮助您获取和操作核心数据。
至于你的具体情况，有点难以分辨，因为你在链接中发布了一长串代码。我请你避免使用链接，因为很多人都无法访问它们，而且由于你要求志愿者提供帮助，你应该让其他人尽可能地帮助你。如果您仍然遇到困难，请考虑在此处创建并在此处发布您的问题，这是一个小得多的程序版本，除了试图证明您要执行的操作之外没有任何功能，minimal example program。< / p>
修改
我已经回顾了你的一些代码，并且看到你的clusterTab，一个应该重命名为ClusterTab的类，在init()方法中将其大部分Swing组件及其模型声明为局部变量，使得这些变量在其余部分中不可见班上的。不要对关键变量执行此操作，尤其是listItems变量，而是将它们设置为私有字段，以便它们具有实例级可见性。
此外，不要将JTabbedPane变量设为静态，因为这表明您的设计已损坏且需要修复。 printTabNames()方法也不应该是静态的。
编辑2
有些玩你的代码 - 如果你试图获得对当前所选标签的引用，你可能根本不需要ArrayList，因为JTabbedPane可以为你做这个。例如：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
@SuppressWarnings("serial")
public class ClusterEndusersGui2 extends JPanel {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
ClusterEndusersGui2 mainPanel = new ClusterEndusersGui2();
JFrame gui = new JFrame("GUI");
gui.add(mainPanel);
gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
gui.pack();
gui.setLocationRelativeTo(null);
gui.setVisible(true);
}
});
}
public ClusterEndusersGui2() {
initComponents();
}
private void initComponents() {
someButton = new JButton("Selected Tabbed Pane");
tabbedPaneClusters = new JTabbedPane();
for (String s : Variables2.focusedHostnames) {
ClusterTab2 cluster = new ClusterTab2(s);
tabbedPaneClusters.addTab(s, cluster);
}
add(tabbedPaneClusters);
add(someButton);
someButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
ClusterTab2 tabbedPane = (ClusterTab2) tabbedPaneClusters.getSelectedComponent();
if (tabbedPane != null) {
System.out.println("Selected Tab: " + tabbedPane.getName());
}
}
});
}
public void printTabNames() {
System.out.println("Tab Name: " + tabbedPaneClusters.getTitleAt(0));
}
private JTabbedPane tabbedPaneClusters;
private JButton someButton;
}
@SuppressWarnings("serial")
class ClusterTab2 extends JPanel {
private DefaultListModel<String> listItems;
public ClusterTab2(String name) {
setName(name);
initComponents();
}
public void getUsers(ActionEvent e) {
//!! ClusterEndusersGui2.printTabNames();
}
private void initComponents() {
final JScrollPane listScrollPane;
final JList<String> list1;
final JButton btnRemoveAll;
final JButton btnAddAll;
final JButton btnRemoveFromAll;
listScrollPane = new JScrollPane();
list1 = new JList<>();
list1.setPrototypeCellValue(" ");
btnRemoveAll = new JButton();
btnAddAll = new JButton();
btnRemoveFromAll = new JButton();
listItems = new DefaultListModel<>();
listItems.addElement("Test");
list1.setModel(listItems);
listScrollPane.setViewportView(list1);
// ---- btnRemoveAll ----
btnRemoveAll.setText("Remove all from Cluster");
btnAddAll.setText("Add all to Cluster");
btnAddAll.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
getUsers(e);
}
});
btnRemoveFromAll.setText("Remove from All Clusters");
JPanel btnPanel = new JPanel(new GridLayout(0, 1, 4, 4));
btnPanel.add(btnRemoveAll);
btnPanel.add(btnAddAll);
btnPanel.add(btnRemoveFromAll);
btnRemoveAll.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
listItems.removeAllElements();
}
});
btnAddAll.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
listItems.addElement("Fubar!");
}
});
JPanel btnWrapPanel = new JPanel(new GridBagLayout());
btnWrapPanel.add(btnPanel);
add(listScrollPane);
add(btnWrapPanel);
}
}
class Variables2 {
public static String[] focusedHostnames = {
"1", "2", "3", "4", "5", "6", "7"
};
}