我正在尝试使用 grouplayout 创建一个 JPanel，但它仍然给出相同的错误。它不附加到水平组。当我运行程序时，有时它是 okButton，然后是 openButton，下一次是单选按钮之一。即使我没有更改代码。我阅读了文档，并且我了解ParallelGroup水平组中的每个人都需要SequentialGroup垂直组中的每个人，反之亦然。
编码：
package gui;
import javax.swing.ButtonGroup;
import javax.swing.GroupLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JButton;
import javax.swing.JProgressBar;
import javax.swing.JRadioButton;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import main.MainMenu;
import java.awt.Color;
import java.awt.Container;
import java.awt.Cursor;
import java.awt.ScrollPane;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
public class UserInterface
{
JFrame guiFrame = new JFrame();
MainMenu menu = new MainMenu();
Task task;
final JButton okButton = new JButton();
public boolean done;
public boolean isDrawed;
public boolean okButtonIsPressed;
public JScrollPane scrollPanel;
public JProgressBar progressBar;
public String text;
public String outputPath = "C:\\Users\\Test\\";
private JPanel mainPanel;
private JPanel dotPanel;
private ButtonGroup group;
private String newFileName;
private JButton openButton;
private JTextArea textForScrollPane;
private JTextField textFieldFilePath;
private JRadioButton radioButtonA;
private JRadioButton radioButtonB;
private JRadioButton radioButtonC;
public void UserInterface()
{
task = new Task();
dotPanel = new JPanel();
mainPanel = new JPanel();
group = new ButtonGroup();
openButton = new JButton();
progressBar = new JProgressBar();
textFieldFilePath = new JTextField();
textForScrollPane = new JTextArea(text);
radioButtonA = new JRadioButton();
radioButtonB = new JRadioButton();
radioButtonC = new JRadioButton();
scrollPanel = new JScrollPane(textForScrollPane, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
}
public void makeFrame()
{
isDrawed = false;
okButtonIsPressed = false;
//Settings for the Frame
guiFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
guiFrame.setSize(500,500);
guiFrame.setLocationRelativeTo(null);
guiFrame.setVisible(true);
//Give the right names to the buttons and textfields
okButton.setText("OK");
openButton.setText("Open");
textFieldFilePath.setText("...Choos path...");
radioButtonA.setText("Option a");
radioButtonB.setText("option b");
radioButtonC.setText("option c");
//Make a buttonGroup for the radio buttons, for easy use
group.add(radioButtonA);
group.add(radioButtonB);
group.add(radioButtonC);
//Set the textForScrollPane
textForScrollPane.setLineWrap(true);
textForScrollPane.setEditable(false);
textForScrollPane.setWrapStyleWord(true);
//Settings for the progressbar
progressBar = new JProgressBar(0, 100);
progressBar.setValue(50);
progressBar.setForeground(Color.blue);
progressBar.setStringPainted(true);
isDrawed = true;
System.out.println("~~~~~~drawed");
makePanelLayout();
}
public void panelActions()
{
//Make a new thread to update the frame and make progress on the same time
Runnable runner = new Runnable()
{
@Override
public void run()
{
System.out.println("running");
okButton.setActionCommand("ok");
okButton.addActionListener(new ActionListener()
{
@Override
public void actionPerformed(ActionEvent evt)
{
okButton.setEnabled(false);
Container container = guiFrame.getContentPane();
container.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
done = false;
okButtonIsPressed = true;
}
});
openButton.addActionListener(new ActionListener()
{
@Override
public void actionPerformed(ActionEvent evt)
{
openButton.setEnabled(false);
String path = "C:\\Users\\";
String openPath = menu.ChooseFile(path);
textFieldFilePath.setText(openPath);
}
});
task.addPropertyChangeListener(new PropertyChangeListener()
{
@Override
public void propertyChange(PropertyChangeEvent evt)
{
if ("progress" == evt.getPropertyName())
{
int progress = (Integer) evt.getNewValue();
progressBar.setIndeterminate(false);
progressBar.setValue(progress);
System.out.println("update progress " + progress);
//scrollPanel.add(String.format("Completed %d%% of task.\n", progress), guiFrame);
}
}
});
task.execute();
};
};
Thread tProgressbar = new Thread(runner, "Update progressbar");
tProgressbar.start();
}
public void makePanelLayout()
{
GroupLayout mainPanelLayout = new javax.swing.GroupLayout(mainPanel);
mainPanel.setLayout(mainPanelLayout);
mainPanelLayout.setHorizontalGroup(mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGap(0, 176, Short.MAX_VALUE));
mainPanelLayout.setVerticalGroup(mainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGap(0, 0, Short.MAX_VALUE));
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(guiFrame.getContentPane());
guiFrame.getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(scrollPanel, javax.swing.GroupLayout.PREFERRED_SIZE, 364, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(106, 106, 106)
.addComponent(okButton))
.addComponent(radioButtonA)
.addComponent(radioButtonB)
.addComponent(radioButtonC))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(dotPanel, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addComponent(progressBar, javax.swing.GroupLayout.PREFERRED_SIZE, 364, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(layout.createSequentialGroup()
.addComponent(textFieldFilePath, javax.swing.GroupLayout.PREFERRED_SIZE, 287, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(openButton)))
.addContainerGap(39, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(22, 22, 22)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(dotPanel, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(layout.createSequentialGroup()
.addComponent(radioButtonA)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(radioButtonB)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(radioButtonC)))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(textFieldFilePath, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(openButton))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(okButton)
.addGap(18, 18, 18)
.addComponent(progressBar, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(scrollPanel, javax.swing.GroupLayout.PREFERRED_SIZE, 74, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
}
}
__________________________
the other class:
__________________________
package gui;
import java.awt.Container;
import java.awt.Cursor;
import java.awt.Toolkit;
import java.util.List;
import java.util.Random;
import javax.swing.JLabel;
import javax.swing.SwingWorker;
class Task extends SwingWorker<Void, Integer>
{
public int progress = 0;
UserInterface use = new UserInterface();
@Override
public Void doInBackground() {
Random random = new Random();
progress = 0;
setProgress(0);
//Sleep for at least one second to simulate "startup".
try
{
Thread.sleep(1000 + random.nextInt(2000));
}
catch (InterruptedException ignore) {}
if(use.isDrawed && use.okButtonIsPressed)
{
while (progress < 100)
{
//Sleep for up to one second.
try
{
Thread.sleep(random.nextInt(1000));
}
catch (InterruptedException ignore) {}
//Make random progress.
progress += random.nextInt(10);
System.out.println("progress" + progress);
publish(progress);
use.text = "progress " + progress;
System.out.println("text updated");
use.scrollPanel.setViewportView(new JLabel("progress " + progress));
setProgress(Math.min(progress, 100));
}
}
return null;
}
@Override
protected void process(List<Integer> chunks)
{
System.out.println("in the process");
if(chunks != null && use.isDrawed)
{
for (int chunk : chunks)
{
if(chunk > 0)
{
use.progressBar.setValue(chunk);
System.out.println("chunk " + chunk);
}
}
}
}
public void done()
{
Toolkit.getDefaultToolkit().beep();
use.okButton.setEnabled(true);
Container container = use.guiFrame.getContentPane();
progress = 100;
container.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
}
public int getLengthOfTask()
{
return progress;
}
}
错误：
Exception in thread "AWT-EventQueue-0" java.lang.IllegalStateException: javax.swing.JButton[,0,0,0x0,invalid,alignmentX=0.0,alignmentY=0.5,border=javax.swing.plaf.BorderUIResource$CompoundBorderUIResource@4a53fb57,flags=296,maximumSize=,minimumSize=,preferredSize=,defaultIcon=,disabledIcon=,disabledSelectedIcon=,margin=javax.swing.plaf.InsetsUIResource[top=2,left=14,bottom=2,right=14],paintBorder=true,paintFocus=true,pressedIcon=,rolloverEnabled=true,rolloverIcon=,rolloverSelectedIcon=,selectedIcon=,text=OK,defaultCapable=true] is not attached to a horizontal group
at javax.swing.GroupLayout.checkComponents(GroupLayout.java:1065)
at javax.swing.GroupLayout.prepare(GroupLayout.java:1019)
at javax.swing.GroupLayout.layoutContainer(GroupLayout.java:889)
at java.awt.Container.layout(Container.java:1419)
at java.awt.Container.doLayout(Container.java:1408)
at java.awt.Container.validateTree(Container.java:1505)
at java.awt.Container.validateTree(Container.java:1511)
at java.awt.Container.validateTree(Container.java:1511)
at java.awt.Container.validateTree(Container.java:1511)
at java.awt.Container.validate(Container.java:1478)
at java.awt.Window.dispatchEventImpl(Window.java:2482)
at java.awt.Component.dispatchEvent(Component.java:4488)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:674)
at java.awt.EventQueue.access$400(EventQueue.java:81)
at java.awt.EventQueue$2.run(EventQueue.java:633)
at java.awt.EventQueue$2.run(EventQueue.java:631)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
at java.awt.EventQueue$3.run(EventQueue.java:647)
at java.awt.EventQueue$3.run(EventQueue.java:645)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:644)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
谢谢您的帮助 ：）