import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import java.io.File;
import java.io.IOException;
public class PipeFilterTestGui extends JPanel
{
private JScrollPane btnPane;
private JSplitPane splitPane;
private JSplitPane rightSplitPane;
private JTextArea originalTxt;
private JTextArea resultTxt;
private JScrollPane originPane;
private JScrollPane resultPane;
private JLabel filelbl;
private JPanel buttonPanel;
private JComboBox cmbFileList;
static final String PROCESS = "Process";
static final String EXIT = "Exit";
static final String ORIGINALFILES = "OriginalFiles/";
static final Dimension minimumSize = new Dimension(230, 200);
public PipeFilterTestGui()
{
super(new GridLayout(1, 0));
resultTxt = new JTextArea("Encrypted File Text\n\n", 6, 20);
originalTxt = new JTextArea("Original File Text: \n\n", 6, 20);
buildUpScrollGUI();
}
private void buildUpScrollGUI()
{
// Setup buttonPanel, which contains all buttons and
// will be used in btnPane below
setUpButtonPanel();
btnPane = new JScrollPane(buttonPanel);
btnPane.setMinimumSize(minimumSize);
resultPane = new JScrollPane(resultTxt);
originPane = new JScrollPane(originalTxt);
rightSplitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT);
rightSplitPane.setLeftComponent(originPane);
rightSplitPane.setRightComponent(resultPane);
rightSplitPane.setDividerLocation(190);
splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT);
splitPane.setLeftComponent(btnPane);
splitPane.setRightComponent(rightSplitPane);
splitPane.setDividerLocation(220);
splitPane.setPreferredSize(new Dimension(600, 250));
add(splitPane);
setSize(new Dimension(600, 400));
setVisible(true);
}
private void setUpButtonPanel()
{
cmbFileList = new JComboBox();
String[] cl = extractFileList();
setupFileList(cmbFileList, cl);
filelbl = new JLabel("Files:");
// Create buttons
JButton srchButton = new JButton(PROCESS);
srchButton.setMnemonic(KeyEvent.VK_S);
JButton exitButton = new JButton(EXIT);
exitButton.setMnemonic(KeyEvent.VK_X);
ButtonListener btnListener = new ButtonListener();
// add action Listener
srchButton.addActionListener(btnListener);
exitButton.addActionListener(btnListener);
buttonPanel = new JPanel();
GridBagLayout gridbag = new GridBagLayout();
buttonPanel.setLayout(gridbag);
GridBagConstraints gbc = new GridBagConstraints();
buttonPanel.add(filelbl);
buttonPanel.add(cmbFileList);
buttonPanel.add(srchButton);
buttonPanel.add(exitButton);
gbc.insets.top = 5;
gbc.insets.bottom = 5;
gbc.insets.left = 5;
gbc.insets.right = 5;
gbc.anchor = GridBagConstraints.EAST;
gbc.gridx = 0;
gbc.gridy = 0;
gridbag.setConstraints(filelbl, gbc);
gbc.anchor = GridBagConstraints.WEST;
gbc.gridx = 1;
gbc.gridy = 0;
gridbag.setConstraints(cmbFileList, gbc);
gbc.anchor = GridBagConstraints.EAST;
gbc.gridx = 0;
gbc.gridy = 1;
gbc.insets.left = 2;
gbc.insets.right = 2;
gbc.insets.top = 25;
gbc.anchor = GridBagConstraints.EAST;
gbc.gridx = 0;
gbc.gridy = 3;
gridbag.setConstraints(srchButton, gbc);
gbc.anchor = GridBagConstraints.WEST;
gbc.gridx = 1;
gbc.gridy = 3;
gridbag.setConstraints(exitButton, gbc);
}
/* ========================================= */
/* Get a selected file name from User GUI */
/* ========================================= */
public String getSelectedFile()
{
return (String) cmbFileList.getSelectedItem();
}
/* ================================================ */
/* Extract file names from a diectory on your */
/* computer */
/* ================================================ */
public String[] extractFileList()
{
File f = new File(ORIGINALFILES);
String[] fileNames = f.list();
return fileNames;
}
/* ============================================== */
/* Add car list to combox cmbFileList. Both */
/* objects cmbFileList and files are passed */
/* in from parameters. */
/* ============================================== */
public void setupFileList(JComboBox cmbFileList, String[] files)
{
for (int k = 0; k < files.length; k++)
{
cmbFileList.addItem(files[k]);
}
}
class ButtonListener implements ActionListener
{
String carPrice;
public void actionPerformed(ActionEvent e)
{
String searchResult = null;
if (e.getActionCommand().equals(EXIT))
{
System.exit(1);
}
if (e.getActionCommand().equals(PROCESS))
{
String selectedFile = getSelectedFile();
try
{
originalTxt.append("File Name: " + selectedFile + "\n\n");
resultTxt.append("From file: " + selectedFile + "\n");
AssemblyOfPipeLines apline = new AssemblyOfPipeLines();
apline.assembly(selectedFile, originalTxt, resultTxt);
} catch (IOException ex)
{
}
}
}
} // End of class ButtonListener
private static void createAndShowGUI()
{
JFrame.setDefaultLookAndFeelDecorated(true);
JFrame frame = new JFrame("Pipes and Filters Architecture demo- Legacy File Update");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
PipeFilterTestGui newContentPane = new PipeFilterTestGui();
newContentPane.setOpaque(true);
frame.setContentPane(newContentPane);
frame.pack();
frame.setVisible(true);
}
static public void main(String argv[])
{
javax.swing.SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
createAndShowGUI();
}
});
}
}
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at PipeFilterTestGui.setupFileList(PipeFilterTestGui.java:150)
at PipeFilterTestGui.setUpButtonPanel(PipeFilterTestGui.java:67)
at PipeFilterTestGui.buildUpScrollGUI(PipeFilterTestGui.java:37)
at PipeFilterTestGui.(PipeFilterTestGui.java:30)
at PipeFilterTestGui.createAndShowGUI(PipeFilterTestGui.java:191)
at PipeFilterTestGui.access$2(PipeFilterTestGui.java:185)
at PipeFilterTestGui$1.run(PipeFilterTestGui.java:205)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$500(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
还有其他几个类。 需要上传吗？
http://blog.csdn.net/kesalin/article/details/8738992
Exception in thread "AWT-EventQueue-0" java.util.ConcurrentModificationException
at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
at java.uti......
答案就在这里：Exception in thread "AWT-EventQueue-0" java.util.ConcurrentModificationException
----------------------Hi，地球人，我是问答机器人小S，上面的内容就是我狂拽酷炫叼炸天的答案，除了赞同，你还有别的选择吗？