I am trying to read from a file that contains three numbers. The file looks like this:
45
20
32
My code is below:
import java.awt.Color;
import java.awt.Desktop.Action;
import java.awt.GridLayout;
import java.awt.Label;
import java.awt.MenuItem;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.Arrays;
import java.util.Scanner;
import javax.swing.Timer;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.JSlider;
import javax.swing.border.TitledBorder;
public class practise implements ActionListener {
int menuCount = 0;
int [] fileValues = new int[3];
JFrame frame1 = new JFrame();
JPanel[] panels = new JPanel[3];
JMenuItem menuitemMyDialog1 = new JMenuItem( "Open File" );
JMenuItem menuitemMyDialog2 = new JMenuItem( "EXIT" );
JMenuBar menuBar = new JMenuBar( );
JMenu menuData = new JMenu( "Menu" );
Label label = new Label();
JSlider slider = new JSlider( JSlider.VERTICAL,0,100,20);;
Timer timer = new Timer(1000,new TimerAction());
void go(){
frame1.setTitle("Referred Coursework");
frame1.setSize(600, 300);
frame1.setVisible(true);
buildGUI();
menuitemMyDialog1.addActionListener( this );
menuData.add( menuitemMyDialog1 );
//buildGUI();
menuitemMyDialog2.addActionListener( this );
menuData.add( menuitemMyDialog2 );
menuBar.add( menuData );
frame1.setJMenuBar( menuBar );
}
int b = 0;
class TimerAction implements ActionListener{
public void actionPerformed(ActionEvent e){
if(b == 3){ timer.stop(); }
slider.setValue(fileValues[b]);
b++;
}
}
#Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
if(arg0.getSource() == menuitemMyDialog1){
menuCount = 1;
String inputValue = JOptionPane.showInputDialog("File Open dialog box");
label.setSize(80,80);
label.setText(inputValue);
label.setLocation(40,160);
//fileValues[1] = 27; fileValues[0] = 2; fileValues[2] = 62;
try {
FileReader file = new FileReader("temperature.txt");
BufferedReader buf = new BufferedReader(file);
int i = 0;
String s = null;
while((s = buf.readLine()) != null){
fileValues[i] = Integer.parseInt(s);
i++;
}
}catch (Exception e){e.printStackTrace();}
Arrays.sort(fileValues);
for (int i : fileValues){
System.out.println(i);
}
timer.start();
}
if(arg0.getSource() == menuitemMyDialog2){
frame1.dispose();
System.exit(0);
}
}
public void buildGUI(){
layoutComponents();
}
public void layoutComponents(){
JLabel label1 = new JLabel();
JSlider slider2,slider3;
//JProgressBar bar = new JProgressBar( JProgressBar.VERTICAL,1000, 1020 );
panels[0] = new JPanel();
panels[1] = new JPanel();
panels[2] = new JPanel();
panels[1].setBorder( new TitledBorder( "Temperature" ) );
slider.setMajorTickSpacing(20);
slider.setPaintTicks( true );
slider.setPaintLabels( true );
slider.setMinorTickSpacing(10);
panels[1].add( slider );
panels[1].setBackground(Color.orange);
frame1.setLayout( new GridLayout( 1,2 ) );
for ( int i = 0; i < panels.length;i++ ){
frame1.add( panels[i] );
}
}
/**
* #param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
practise obj = new practise();
obj.go();
}
}
The program compiles alright and gives no errors. But when I output the contents of the array fileValues I get:
0
0
0
Any help would be appreciated. Thanks!
Update I reviewed the exception for FileReader and now it is showing a FileNotFoundException. This is strange as the file exists in the project folder. Any suggestions??
You need to provide the full path for "temperature.txt".
You ignore the exceptions sent by your I/O operations:
try {
FileReader file = new FileReader("temperature.txt");
BufferedReader buf = new BufferedReader(file);
int i = 0;
String s = null;
while ((s = buf.readLine()) != null) {
fileValues[i] = Integer.parseInt(s);
i++;
}
} catch (Exception e) {
}
If you replace the catch block by something like:
} catch (Exception e) {
System.out.println(e.getMessage());
}
You should get a self explanatory message.
Related
===============================================
Adding this here since it's too long for a comment:
I can see I was unclear. When running MaintTest/main, the JFrame with Test button is not the problem. The JFrame which gets displayed when you click the test button is the problem.
Commenting out the FileUtils.copyURLToFile try block makes the 2nd JFrame display so briefly it's not clear whether it shows the label and progbar or not. (The initial JFrame with the Test button appears normally, when I click the Test button, the 2nd JFrame appears for an instant and goes away. The JFrame with the Test button remains, as expected. I don't reproduce "a Test button 6 times in a row". That sounds like things are set up wrong maybe?)
Yes copyURLToFile is blocking, but I start the concurrent display of the 2nd JFrame before I call copyURLToFile, so shouldn't it run in a separate thread anyway? I have a reason to know trhat it does. In the original application from which this code is derived, the 2nd JFrame displays as desired sometimes.
JFrame displaying sometimes is always answered by saying setVisible has to be called last, but that does not address my situation. This appears to have something to do with concurrency and Swing that I don't understand.
===============================================
Usually I can find the answers via google (more often than not at SO). I must be missing something here.
I've whittled this down to a small portion of my actual code and am still not enlightened. Sorry if it's still a little large, but it's hard to condense it further.
There are 3 java files. This references commons-io-2.5.jar. I'm coding/running in Eclipse Neon.
If I run ProgressBar/main() I see the JFrame contents. If I run MainTest/main() I don't. Here are the 3 files (please excuse some indentation anomalies -- the SO UI and I didn't agree on such things):
MainTest
public class MainTest {
public static void main(String[] args) {
MainFrame mainFrame = new MainFrame();
}
}
MainFrame
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import org.apache.commons.io.FileUtils;
public class MainFrame extends JFrame implements ActionListener {
JButton jButton = new JButton();
public MainFrame() {
// Set up the content pane.
Container contentPane = this.getContentPane();
contentPane.setLayout(new BoxLayout(contentPane, BoxLayout.Y_AXIS));
jButton.setAlignmentX(Component.CENTER_ALIGNMENT);
jButton.setText("Test");
jButton.setActionCommand("Test");
jButton.addActionListener(this);
contentPane.add(jButton);
setup();
}
private void setup() {
Toolkit tk;
Dimension screenDims;
tk = Toolkit.getDefaultToolkit();
screenDims = tk.getScreenSize();
this.setLocation((screenDims.width - this.getWidth()) / 2, (screenDims.height - this.getHeight()) / 2);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.pack();
this.setVisible(true);
}
public static void downloadExecutable(String str) {
URL url = null;
try {
url = new URL("http://pegr-converter.com/download/test.jpg");
} catch (MalformedURLException exc) {
JOptionPane.showMessageDialog(null, "Unexpected exception: " + exc.getMessage());
return;
}
if (url != null) {
String[] options = { "OK", "Change", "Cancel" };
int response = JOptionPane.NO_OPTION;
File selectedFolder = new File(getDownloadDir());
File selectedLocation = new File(selectedFolder, str + ".jpg");
while (response == JOptionPane.NO_OPTION) {
selectedLocation = new File(selectedFolder, str + ".jpg");
String msgStr = str + ".jpg will be downloaded to the following location:\n"
+ selectedLocation.toPath();
response = JOptionPane.showOptionDialog(null, msgStr, "Pegr input needed",
JOptionPane.YES_NO_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE, null, options, options[0]);
if (response == JOptionPane.NO_OPTION) {
// Prompt for file selection.
JFileChooser fileChooser = new JFileChooser();
fileChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
fileChooser.setCurrentDirectory(selectedFolder);
fileChooser.showOpenDialog(null);
selectedFolder = fileChooser.getSelectedFile();
}
}
if (response == JOptionPane.YES_OPTION) {
int size = 0;
URLConnection conn;
try {
conn = url.openConnection();
size = conn.getContentLength();
} catch (IOException exc) {
System.out.println(exc.getMessage());
}
File destination = new File(selectedFolder, str + ".jpg");
ProgressBar status = new ProgressBar("Downloading " + str + ".jpg", destination, size);
try {
FileUtils.copyURLToFile(url, destination, 10000, 300000);
} catch (IOException exc) {
JOptionPane.showMessageDialog(null, "Download failed.");
return;
}
status.close();
}
}
}
public static String getDownloadDir() {
String home = System.getProperty("user.home");
File downloadDir = new File(home + "/Downloads/");
if (downloadDir.exists() && !downloadDir.isDirectory()) {
return home;
} else {
downloadDir = new File(downloadDir + "/");
if ((downloadDir.exists() && downloadDir.isDirectory()) || downloadDir.mkdirs()) {
return downloadDir.getPath();
} else {
return home;
}
}
}
#Override
public void actionPerformed(ActionEvent arg0) {
downloadExecutable("test");
}
}
ProgressBar
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.Timer;
import java.util.TimerTask;
import javax.imageio.ImageIO;
import javax.swing.BoxLayout;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JProgressBar;
import javax.swing.SwingConstants;
import org.apache.commons.io.FileUtils;
public class ProgressBar {
private String title;
private File outputFile;
private int size;
private ProgressTimerTask task;
JFrame frame;
JLabel jLabelProgressTitle;
JProgressBar jProgressBarProportion;
public ProgressBar(String title, File output, int size) {
this.title = title;
this.outputFile = output;
this.size = size;
frame = new JFrame("BoxLayoutDemo");
jProgressBarProportion = new JProgressBar();
jProgressBarProportion.setPreferredSize(new Dimension(300, 50));
jLabelProgressTitle = new JLabel();
jLabelProgressTitle.setHorizontalAlignment(SwingConstants.CENTER);
jLabelProgressTitle.setText("Progress");
jLabelProgressTitle.setPreferredSize(new Dimension(300, 50));
//Set up the content pane.
Container contentPane = frame.getContentPane();
contentPane.setLayout(new BoxLayout(contentPane, BoxLayout.Y_AXIS));
jLabelProgressTitle.setAlignmentX(Component.CENTER_ALIGNMENT);
contentPane.add(jLabelProgressTitle);
jProgressBarProportion.setAlignmentX(Component.CENTER_ALIGNMENT);
contentPane.add(jProgressBarProportion);
setup();
task = new ProgressTimerTask(this, outputFile, size);
Timer timer = new Timer();
timer.scheduleAtFixedRate(task, 0, 500);
}
private void setup() {
Toolkit tk;
Dimension screenDims;
frame.setTitle("Test");
tk = Toolkit.getDefaultToolkit();
screenDims = tk.getScreenSize();
frame.setLocation((screenDims.width - frame.getWidth()) / 2, (screenDims.height - frame.getHeight()) / 2);
jLabelProgressTitle.setText(title);
jProgressBarProportion.setVisible(true);
jProgressBarProportion.setMinimum(0);
jProgressBarProportion.setMaximum(size);
jProgressBarProportion.setValue((int) outputFile.length());
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
public void close() {
task.cancel();
frame.dispose();
}
public static void main(String[] args) throws InterruptedException {
ProgressBar progBar = new ProgressBar("Test Title", new File(MainFrame.getDownloadDir() + "test.jpg"), 30000);
Thread.sleep(3000);
progBar.close();
}
}
class ProgressTimerTask extends TimerTask {
ProgressBar frame;
File outputFile;
int size;
public ProgressTimerTask(ProgressBar progressBar, File outputFile, int size) {
this.frame = progressBar;
this.outputFile = outputFile;
this.size = size;
}
public void run() {
frame.jProgressBarProportion.setValue((int) outputFile.length());
System.out.println("Running");
}
}
Thanks to #MadProgrammer for this comment:
I can tell you, that you probably won't see the ProgressBar frame because the FileUtils.copyURLToFile will block until it's finished, in that case, you really should be using a SwingWorker
I read up about SwingWorker at the tutorial https://docs.oracle.com/javase/tutorial/uiswing/concurrency/worker.html and subsequently modified my MainFrame.java module to look like this:
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.SwingWorker;
import org.apache.commons.io.FileUtils;
public class MainFrame extends JFrame implements ActionListener {
JButton jButton = new JButton();
static ProgressBar status;
static URL url;
public MainFrame() {
// Set up the content pane.
Container contentPane = this.getContentPane();
contentPane.setLayout(new BoxLayout(contentPane, BoxLayout.Y_AXIS));
jButton.setAlignmentX(Component.CENTER_ALIGNMENT);
jButton.setText("Test");
jButton.setActionCommand("Test");
jButton.addActionListener(this);
contentPane.add(jButton);
setup();
}
private void setup() {
Toolkit tk;
Dimension screenDims;
tk = Toolkit.getDefaultToolkit();
screenDims = tk.getScreenSize();
this.setLocation((screenDims.width - this.getWidth()) / 2, (screenDims.height - this.getHeight()) / 2);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.pack();
this.setVisible(true);
}
public static void downloadExecutable(String str) {
url = null;
try {
url = new URL("http://pegr-converter.com/download/test.jpg");
} catch (MalformedURLException exc) {
JOptionPane.showMessageDialog(null, "Unexpected exception: " + exc.getMessage());
return;
}
if (url != null) {
String[] options = { "OK", "Change", "Cancel" };
int response = JOptionPane.NO_OPTION;
File selectedFolder = new File(getDownloadDir());
File selectedLocation = new File(selectedFolder, str + ".jpg");
while (response == JOptionPane.NO_OPTION) {
selectedLocation = new File(selectedFolder, str + ".jpg");
String msgStr = str + ".jpg will be downloaded to the following location:\n"
+ selectedLocation.toPath();
response = JOptionPane.showOptionDialog(null, msgStr, "Pegr input needed",
JOptionPane.YES_NO_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE, null, options, options[0]);
if (response == JOptionPane.NO_OPTION) {
// Prompt for file selection.
JFileChooser fileChooser = new JFileChooser();
fileChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
fileChooser.setCurrentDirectory(selectedFolder);
fileChooser.showOpenDialog(null);
selectedFolder = fileChooser.getSelectedFile();
}
}
if (response == JOptionPane.YES_OPTION) {
int size = 0;
URLConnection conn;
try {
conn = url.openConnection();
size = conn.getContentLength();
} catch (IOException exc) {
System.out.println(exc.getMessage());
}
//System.out.println("javax.swing.SwingUtilities.isEventDispatchThread=" + javax.swing.SwingUtilities.isEventDispatchThread());
File destination = new File(selectedFolder, str + ".jpg");
status = new ProgressBar("Downloading " + str + ".jpg", destination, size);
SwingWorker<Void, Void> worker = new SwingWorker<Void, Void>() {
#Override
protected Void doInBackground() throws Exception {
try {
FileUtils.copyURLToFile(url, destination, 10000, 300000);
} catch (IOException exc) {
JOptionPane.showMessageDialog(null, "Download failed.");
}
return null;
}
public void done() {
status.close();
}
};
worker.execute();
}
}
}
public static String getDownloadDir() {
String home = System.getProperty("user.home");
File downloadDir = new File(home + "/Downloads/");
if (downloadDir.exists() && !downloadDir.isDirectory()) {
return home;
} else {
downloadDir = new File(downloadDir + "/");
if ((downloadDir.exists() && downloadDir.isDirectory()) || downloadDir.mkdirs()) {
return downloadDir.getPath();
} else {
return home;
}
}
}
#Override
public void actionPerformed(ActionEvent arg0) {
downloadExecutable("test");
}
}
This worked beautifully.
Running into a lot of problems trying to populate a JList after a button press. The code below utilizes a technique that I have employed successfully before, but I have been unable to get this working. The goal is to run a test after pressing a button and display the urls that passed and the urls that failed in separate JLists.
The Action Listener:
//Start button--starts tests when pressed.
JButton start = new JButton("Start");
start.setPreferredSize(new Dimension(400, 40));
start.setAlignmentX(Component.CENTER_ALIGNMENT);
start.addActionListener(new Web(urlA, codeA, cb, passJ, failJ));
panel2.add(start);
The Action Listener Method:
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;
import java.util.ArrayList;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JList;
public class Web implements ActionListener {
private ArrayList<String> urls;
private ArrayList<Integer> statusCodes;
private JComboBox cb;
private JList passJ = new JList();
private JList failJ = new JList();
//constructor--allows other values to be used
public Web(ArrayList<String> urls, ArrayList<Integer> statusCodes, JComboBox cb, JList passList, JList failList ){
this.urls = urls;
this.statusCodes = statusCodes;
this.cb = cb;
this.passJ = passJ;
this.failJ = failJ;
}
#Override
public void actionPerformed(ActionEvent event){
ArrayList<String> resultsP = new ArrayList<String>();
ArrayList<String> resultsF = new ArrayList<String>();
//get source
JButton start = (JButton) event.getSource();
//get value from combobox
String selected = cb.getSelectedItem().toString();
if(selected.equals("ALL")){
}
if(selected.equals("STATUS CODE")){
for(int i = 0; i < urls.size(); i++){
try {
URL u = new URL(urls.get(i));
HttpURLConnection connection = (HttpURLConnection)u.openConnection(); //open connection and cast to HttpURLConnection
connection.setRequestMethod("GET");
connection.connect();
int code = connection.getResponseCode();
if (code == statusCodes.get(i)){
System.out.println(i + "."+ urls.get(i)+" \t\t\t PASS");
resultsP.add(urls.get(i));
}
else{
System.out.println(i + "." +urls.get(i)+ "\t\t\t FAIL");
resultsF.add(urls.get(i));
}
} catch (MalformedURLException | ProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
for (String str: resultsP){
System.out.println(str);
}
System.out.println("/////////////////////////////////////////////////////////////////////////////////");
for (String str: resultsF){
System.out.println(str);
}
passJ.removeAll();
failJ.removeAll();
passJ.setListData(resultsP.toArray());
failJ.setListData(resultsF.toArray()) ;
passJ.repaint();
failJ.repaint();
}//StatusCodeTest
}
}
How the lists are added to the GUI:
JList passJ = new JList(urlA.toArray());
JScrollPane scroll1 = new JScrollPane(passJ);
scroll1.setPreferredSize(new Dimension (700, 150));
scroll1.setMaximumSize( scroll1.getPreferredSize() );
scroll1.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED);
panel2.add(scroll1);
panel2.add(Box.createRigidArea(new Dimension(0,50)));
JList failJ = new JList(urlA.toArray());
JScrollPane scroll2 = new JScrollPane(failJ);
scroll2.setPreferredSize(new Dimension(700, 150));
scroll2.setMaximumSize(scroll1.getPreferredSize());
scroll2.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED);
panel2.add(scroll2);
//spacer
panel2.add(Box.createRigidArea(new Dimension(0,25)));
Any GUIdance would be greatly appreciated.
Seems you have different instances of passJ/failJ in your Web class and GUI class.
passJ.removeAll(); failJ.removeAll(); doesn't clear items of JList, that method from Container.
Here is simple example of adding/clearing items to JList:
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
public class TestFrame extends JFrame {
private JList<Integer> normal;
private JList<Integer> fail;
private Integer[] vals;
public TestFrame() {
init();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
setLocationRelativeTo(null);
setVisible(true);
}
private void init() {
normal = new JList<Integer>(new DefaultListModel<Integer>());
fail = new JList<Integer>(new DefaultListModel<Integer>());
vals = new Integer[]{1,2,3,4,5,6,7,8,9,33};
JButton add = new JButton("collect data");
add.addActionListener(getCollectListener());
JButton clear = new JButton("clear data");
clear.addActionListener(getClearListener());
JPanel p = new JPanel();
p.add(new JScrollPane(normal));
p.add(new JScrollPane(fail));
JPanel btnPanel = new JPanel();
btnPanel.add(add);
btnPanel.add(clear);
add(p);
add(btnPanel,BorderLayout.SOUTH);
}
private ActionListener getClearListener() {
return new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
((DefaultListModel<Integer>)normal.getModel()).removeAllElements();
((DefaultListModel<Integer>)fail.getModel()).removeAllElements();
}
};
}
private ActionListener getCollectListener() {
return new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
for(Integer i : vals){
if(i%3==0){
((DefaultListModel<Integer>)normal.getModel()).addElement(i);
} else {
((DefaultListModel<Integer>)fail.getModel()).addElement(i);
}
}
}
};
}
public static void main(String args[]) {
new TestFrame();
}
}
I am trying to get this SwingWorker to function correctly. However,the variables that need to be accessed seem to be not global. What do I do? I tried adding static but it creates more errors and complications later about accessing static from non static. The variables that are not working in the SwingWorker are the LOCAL_FILE and URL_LOCATION variables.
package professorphysinstall;
//Imports
import com.sun.jmx.snmp.tasks.Task;
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Insets;
import java.awt.Label;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.RandomAccessFile;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import java.util.Arrays;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.JTextPane;
import javax.swing.SwingWorker;
import javax.tools.FileObject;
import net.sf.sevenzipjbinding.ExtractOperationResult;
import net.sf.sevenzipjbinding.ISequentialOutStream;
import net.sf.sevenzipjbinding.ISevenZipInArchive;
import net.sf.sevenzipjbinding.SevenZip;
import net.sf.sevenzipjbinding.SevenZipException;
import net.sf.sevenzipjbinding.impl.RandomAccessFileInStream;
import net.sf.sevenzipjbinding.simple.ISimpleInArchive;
import net.sf.sevenzipjbinding.simple.ISimpleInArchiveItem;
import org.apache.commons.vfs2.AllFileSelector;
import org.apache.commons.vfs2.FileSystemException;
import org.apache.commons.vfs2.FileSystemManager;
import org.apache.commons.vfs2.VFS;
public class ProfessorPhysInstall {
/**
* #param args the command line arguments
*/
static class Global {
public String location;
}
public static void main(String[] args) {
// TODO code application logic here
//Variables
final JFrame mainframe = new JFrame();
mainframe.setSize(500, 435);
final JPanel cards = new JPanel(new CardLayout());
final CardLayout cl = (CardLayout)(cards.getLayout());
mainframe.setTitle("Future Retro Gaming Launcher");
//Screen1
JPanel screen1 = new JPanel();
JTextPane TextPaneScreen1 = new JTextPane();
TextPaneScreen1.setEditable(false);
TextPaneScreen1.setBackground(new java.awt.Color(240, 240, 240));
TextPaneScreen1.setText("Welcome to the install wizard for Professor Phys!\n\nPlease agree to the following terms and click the next button to continue.");
TextPaneScreen1.setSize(358, 48);
TextPaneScreen1.setLocation(0, 0);
TextPaneScreen1.setBorder(BorderFactory.createCompoundBorder(BorderFactory.createLineBorder(Color.black),BorderFactory.createEmptyBorder(5, 5, 5, 5)));
TextPaneScreen1.setMargin(new Insets(4,4,4,4));
screen1.add(TextPaneScreen1);
JTextArea TextAreaScreen1 = new JTextArea();
JScrollPane sbrText = new JScrollPane(TextAreaScreen1);
TextAreaScreen1.setRows(15);
TextAreaScreen1.setColumns(40);
TextAreaScreen1.setEditable(false);
TextAreaScreen1.setText("stuff");
TextAreaScreen1.setBorder(BorderFactory.createCompoundBorder(BorderFactory.createLineBorder(Color.black),BorderFactory.createEmptyBorder(5, 5, 5, 5)));
TextAreaScreen1.setMargin(new Insets(4,4,4,4));
screen1.add(sbrText);
final JCheckBox Acceptance = new JCheckBox();
Acceptance.setText("I Accept The EULA Agreenment.");
screen1.add(Acceptance);
final JButton NextScreen1 = new JButton();
NextScreen1.setText("Next");
NextScreen1.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent ae) {
if(Acceptance.isSelected())
cl.next(cards);
}
});
screen1.add(NextScreen1);
JButton CancelScreen1 = new JButton();
CancelScreen1.setText("Cancel");
CancelScreen1.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent ae) {
System.exit(0);
}
});
screen1.add(CancelScreen1);
cards.add(screen1);
//Screen2
final JPanel screen2 = new JPanel();
JPanel screen3 = new JPanel();
JTextPane TextPaneScreen2 = new JTextPane();
TextPaneScreen2.setEditable(false);
TextPaneScreen2.setBackground(new java.awt.Color(240, 240, 240));
TextPaneScreen2.setText("Please select the Future Retro Gaming Launcher. Professor Phys will be installed there.");
TextPaneScreen2.setSize(358, 48);
TextPaneScreen2.setLocation(0, 0);
TextPaneScreen2.setBorder(BorderFactory.createCompoundBorder(BorderFactory.createLineBorder(Color.black),BorderFactory.createEmptyBorder(5, 5, 5, 5)));
TextPaneScreen2.setMargin(new Insets(4,4,4,4));
screen2.add(TextPaneScreen2);
JLabel screen2instructions = new JLabel();
screen2instructions.setText("Launcher Location: ");
screen2.add(screen2instructions);
final JTextField folderlocation = new JTextField(25);
screen2.add(folderlocation);
final JButton Browse = new JButton();
final JLabel filelocation = new JLabel();
final JLabel filename = new JLabel();
Browse.setText("Browse");
Browse.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent ae) {
//Create a file chooser
JFileChooser fc = new JFileChooser();
fc.showOpenDialog(screen2);
folderlocation.setText(fc.getSelectedFile().getAbsolutePath());
filelocation.setText(fc.getCurrentDirectory().getAbsolutePath());
filename.setText(fc.getSelectedFile().getName());
}
});
screen2.add(filelocation);
screen2.add(filename);
screen3.add(filelocation);
filelocation.setVisible(false);
filename.setVisible(false);
screen2.add(Browse);
final JButton BackScreen2 = new JButton();
BackScreen2.setText("Back");
BackScreen2.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent ae) {
if(Acceptance.isSelected())
cl.previous(cards);
}
});
screen2.add(BackScreen2);
final JButton NextScreen2 = new JButton();
NextScreen2.setText("Next");
NextScreen2.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent ae) {
//Checking Code
String correctname = "Future_Retro_Gaming_Launcher.jar";
if (filename.getText().equals(correctname))
{
cl.next(cards);
}
else
{
JFrame popup = new JFrame();
popup.setBounds(0, 0, 380, 100);
Label error = new Label();
error.setText("Sorry you must select your Future_Retro_Gaming_Launcher.jar");
popup.add(error);
popup.show();
}
}
});
screen2.add(NextScreen2);
JButton CancelScreen2 = new JButton();
CancelScreen2.setText("Cancel");
CancelScreen2.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent ae) {
System.exit(0);
}
});
screen2.add(CancelScreen2);
cards.add(screen2);
//Screen3
JTextPane TextPaneScreen3 = new JTextPane();
TextPaneScreen3.setEditable(false);
TextPaneScreen3.setBackground(new java.awt.Color(240, 240, 240));
TextPaneScreen3.setText("Professor Phys will be instaleld in the directory you have chosen. Please make sure\nyour launcher is in that folder or the game will not work.\nClick next to begin the install process.");
TextPaneScreen3.setSize(358, 48);
TextPaneScreen3.setLocation(0, 0);
TextPaneScreen3.setBorder(BorderFactory.createCompoundBorder(BorderFactory.createLineBorder(Color.black),BorderFactory.createEmptyBorder(5, 5, 5, 5)));
TextPaneScreen3.setMargin(new Insets(4,4,4,4));
screen3.add(TextPaneScreen3);
final JButton BackScreen3 = new JButton();
BackScreen3.setText("Back");
BackScreen3.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent ae) {
if(Acceptance.isSelected())
cl.previous(cards);
}
});
screen3.add(BackScreen2);
final JButton NextScreen3 = new JButton();
NextScreen3.setText("Next");
NextScreen3.addActionListener(new ActionListener() {
#Override
#SuppressWarnings({"null", "ConstantConditions"})
public void actionPerformed(ActionEvent ae) {
//ProgressBar/Install
System.out.println("FILELOCATION:\n----------");
System.out.println(filelocation.getText());
String URL_LOCATION = "https://dl.dropboxusercontent.com/u/10429987/Future%20Retro%20Gaming/ProfessorPhys.iso";
String LOCAL_FILE = (filelocation.getText() + "\\ProfessorPhys\\");
System.out.println("LOCALFILE:\n-------");
System.out.println(LOCAL_FILE);
RandomAccessFile randomAccessFile = null;
ISevenZipInArchive inArchive = null;
try {
randomAccessFile = new RandomAccessFile(LOCAL_FILE+"professorphys.iso", "r");
inArchive = SevenZip.openInArchive(null, // autodetect archive type
new RandomAccessFileInStream(randomAccessFile));
// Getting simple interface of the archive inArchive
ISimpleInArchive simpleInArchive = inArchive.getSimpleInterface();
System.out.println(" Hash | Size | Filename");
System.out.println("----------+------------+---------");
for (ISimpleInArchiveItem item : simpleInArchive.getArchiveItems()) {
final int[] hash = new int[] { 0 };
if (!item.isFolder()) {
ExtractOperationResult result;
final long[] sizeArray = new long[1];
result = item.extractSlow(new ISequentialOutStream() {
public int write(byte[] data) throws SevenZipException {
hash[0] ^= Arrays.hashCode(data); // Consume data
sizeArray[0] += data.length;
return data.length; // Return amount of consumed data
}
});
if (result == ExtractOperationResult.OK) {
System.out.println(String.format("%9X | %10s | %s", //
hash[0], sizeArray[0], item.getPath()));
} else {
System.err.println("Error extracting item: " + result);
}
}
}
} catch (Exception e) {
System.err.println("Error occurs: " + e);
System.exit(1);
} finally {
if (inArchive != null) {
try {
inArchive.close();
} catch (SevenZipException e) {
System.err.println("Error closing archive: " + e);
}
}
if (randomAccessFile != null) {
try {
randomAccessFile.close();
} catch (IOException e) {
System.err.println("Error closing file: " + e);
}
}
}
}
});
screen3.add(NextScreen3);
JButton CancelScreen3 = new JButton();
CancelScreen3.setText("Cancel");
CancelScreen3.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent ae) {
System.exit(0);
}
});
screen3.add(CancelScreen3);
System.out.println("Done");
JProgressBar progress = new JProgressBar();
progress.setIndeterminate(true);
screen3.add(progress);
cards.add(screen3);
mainframe.add(cards);
mainframe.setVisible(true);
}
}
class DownloadWorker extends SwingWorker<Integer, Integer>
{
protected Integer doInBackground() throws Exception
{
try {
URL website = new URL(URL_LOCATION);
ReadableByteChannel rbc = Channels.newChannel(website.openStream());
FileOutputStream fos = new FileOutputStream(LOCAL_FILE+"\\ProfessorPhys.iso\\");
fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
System.out.println("--------\nDone Downloading\n---------");
} catch (Exception e) {
System.err.println(e);
}
return 42;
}
protected void done()
{
try
{
System.out.println("done");
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
Your program is mostly a huge static main method. You're kind of getting the cart in front of the horse trying to do advanced programming such as with SwingWorker before first creating clean OOP code. In other words -- start over and do it right. Then the connections between classes will be much more natural and it will be much easier to get things to work right. The main method should only concern itself with starting the Swing event thread, creating a GUI object in that thread, and displaying it. Everything else should be in classes that create objects.
Also, on a more practical level, you have yet to tell us what variables are causing you trouble or what errors you might be seeing. Also, where are you trying to create and execute the SwingWorker?
Edit
One tip that will likely help: Give your SwingWorker class a constructor, and pass important parameters into your SwingWorker object via constructor parameters. Then use those parameters to initialize class fields that will be used in the SwingWorker's doInBackground method.
e.g.,
class DownloadWorker extends SwingWorker<Integer, Integer>
{
private String urlLocation;
private String localFile;
public DownLoadWorker(String urlLocation, String localFile) {
this.urlLocation = urlLocation;
this.localFile = localFile;
}
protected Integer doInBackground() throws Exception
{
try {
URL website = new URL(urlLocation);
ReadableByteChannel rbc = Channels.newChannel(website.openStream());
FileOutputStream fos = new FileOutputStream(localFile +"\\ProfessorPhys.iso\\");
fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
System.out.println("--------\nDone Downloading\n---------");
} catch (Exception e) {
System.err.println(e);
}
return 42;
}
protected void done()
{
try
{
System.out.println("done");
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
i want to show all objects in a table.
i have a folder named /menschen which contains files like this: "firstname.lastname.ser"
package adressverwaltung;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JButton;
import javax.swing.JOptionPane;
// FILE
import java.io.*;
import java.util.*;
import java.util.Formatter;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.awt.HeadlessException;
import javax.swing.BorderFactory;
import javax.swing.BoxLayout;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.SpringLayout;
/**
*
* #author
*/
public class Adressverwaltung {
JFrame mainWindow;
final File folder = new File("menschen");
/**
* #param args the command line arguments
*/
public static void main(String[] args) {
Adressverwaltung verweiss = new Adressverwaltung();
verweiss.main();
}
public void main() {
mainWindow = new JFrame();
mainWindow.setBounds(0, 0, 800, 400);
mainWindow.setLocationRelativeTo(null);
mainWindow.setLayout(null);
mainWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mainWindow.setResizable(false);
mainWindow.setVisible(true);
mainWindow.setLayout(new FlowLayout());
menu();
}
public String deserialize(String m, int field) {
try {
FileInputStream fin = new FileInputStream("menschen\\" + m);
ObjectInputStream ois = new ObjectInputStream(fin);
Person n = (Person) ois.readObject();
ois.close();
switch (field) {
case 1:
return n.vorname;
case 2:
return n.nachname;
}
} catch (Exception ex) {
ex.printStackTrace();
}
return null;
}
public static void table(String[][] alle) {
String[] columnNames = {
"Vorname", "Nachname"
};
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTable table = new JTable(alle, columnNames);
f.add(new JScrollPane(table));
f.pack();
f.setVisible(true);
}
private static void serialize(Person m) {
try {
FileOutputStream fileOut =
new FileOutputStream("menschen\\" + m.vorname + "." + m.nachname + ".ser");
ObjectOutputStream out =
new ObjectOutputStream(fileOut);
out.writeObject(m);
out.close();
fileOut.close();
} catch (IOException i) {
}
}
public void menu() {
JPanel list = new JPanel();
list.setBorder(BorderFactory.createLineBorder(Color.black));
list.setPreferredSize(new java.awt.Dimension(400, 360));
list.setBackground(Color.white);
mainWindow.add(list);
// Wir lassen unseren Dialog anzeigen
mainWindow.setVisible(true);
int ButtonWidth = 100;
int ButtonHeight = 30;
int ButtonTop = 10;
JButton Button1 = new JButton("List all");
JButton Button3 = new JButton("Search");
Button1.setBounds(10, ButtonTop, ButtonWidth, ButtonHeight);
Button3.setBounds(230, ButtonTop, ButtonWidth, ButtonHeight);
list.add(Button1);
list.add(Button3);
mainWindow.add(list);
createForm();
Button1.addActionListener(new ActionListener() {
public void actionPerformed(final ActionEvent e) {
list(folder);
}
});
}
public void list(final File folder) {
String[][] rowData = new String[3][];
int r = 0;
for (final File fileEntry : folder.listFiles()) {
if (fileEntry.isDirectory()) {
} else {
String name = fileEntry.getName();
rowData[r][0] = deserialize(name, 1);
rowData[r][1] = deserialize(name, 2);
r++;
}
}
table(rowData);
}
private void createForm() {
JPanel p = new JPanel();
p.setLayout(new GridLayout(3, 2));
JButton b = new JButton("Neue Person!");
JLabel vornameLabel = new JLabel("Vorname:");
final JTextField vorname = new JTextField();
JLabel nachnameLabel = new JLabel("Nachname:");
final JTextField nachname = new JTextField();
p.add(vornameLabel);
p.add(vorname);
p.add(nachnameLabel);
p.add(nachname);
p.add(b);
p.setBorder(BorderFactory.createLineBorder(Color.black));
p.setPreferredSize(new java.awt.Dimension(300, 100));
p.setBackground(Color.white);
mainWindow.add(p);
// Wir lassen unseren Dialog anzeigen
mainWindow.setVisible(true);
b.addActionListener(new ActionListener() {
public void actionPerformed(final ActionEvent e) {
Person m = new Person(vorname.getText(), nachname.getText());
serialize(m);
JOptionPane.showMessageDialog(null, vorname.getText() + "." + nachname.getText() + ".ser abgespeichert.", "Tutorial 2", JOptionPane.INFORMATION_MESSAGE);
}
});
}
}
And this is my Person class:
package adressverwaltung;
/**
*
* #author Mahshid
*/
class Person implements java.io.Serializable {
// Allgemeine Kontaktinformationen:
public String vorname;
public String nachname;
// Adresse
public String strasse;
public int hausnummer;
public int postleitzahl;
public String ort;
public String land;
// Telefon
public int mobil;
public int festnetz;
// Email & Kommentar
public String mail;
public String kommentar;
Person(String vorname, String nachname) {
this.vorname = vorname;
this.nachname = nachname;
}
}
I think there is a problem in list() function. this is my first java code so please don't be surpriced if you see any big mistakes :)
By creating a 2D array like this:
String[][] rowData = new String[3][];
you are creating an array where where all the "column" data is not initialized. You can check this for yourself by doing:
for (String[] s: rowData) {
System.out.println(s);
}
Therefore attempting to assign any of the outer array elements to a single String is impossible:
rowData[r][0] = deserialize(name, 1);
In my previous question, I've stated I'm somewhat new to Java's JFrame features.
I'm trying to create a JFileChooser that will get a directory in which a file named setup.exe will be saved. That's irrelevant, though.
I'm receiving this error:
C:\Users\b\Downloads\files\thankyousanta>javac UpdateMechanism.java
UpdateMechanism.java:31: error: <identifier> expected
fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
^
UpdateMechanism.java:31: error: <identifier> expected
fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
^
UpdateMechanism.java:33: error: <identifier> expected
openButton.addActionListener(openButton);
^
UpdateMechanism.java:33: error: <identifier> expected
openButton.addActionListener(openButton);
^
4 errors
...for this code:
import java.awt.event.*;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontFormatException;
import java.awt.GraphicsEnvironment;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.Scanner;
import javax.swing.filechooser.*;
import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JButton;
import javax.swing.JTextArea;
import javax.swing.JScrollPane;
import javax.swing.JFileChooser;
import javax.swing.BoxLayout;
import javax.Swing.SwingUtilities;
import javax.swing.BorderFactory;
import javax.swing.border.EmptyBorder;
import javax.imageio.ImageIO;
public class definitiveVoid extends JFileChooser implements ActionListener {
JFileChooser fc = new JFileChooser();
fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
JButton openButton = new JButton("The update is waiting on you.");
openButton.addActionListener(openButton);
}
public class UpdateMechanism extends JPanel
implements ActionListener {
public void actionPerformed(ActionEvent e) {
if (e.getSource() == openButton) {
int returnVal = fc.showOpenDialog(UpdateMechanism.this);
if (returnVal == JFileChooser.APPROVE_OPTION) {
File file = fc.getSelectedFile();
} else {
// operation cancelled
}
} else {
// destroy life
}
}
private static String readURL(String targetURL) {
String returnish = "";
try {
URL tempURL = new URL(targetURL);
Scanner s = new Scanner(tempURL.openStream());
while (s.hasNextLine()) {
returnish = returnish+s.nextLine();
}
} catch (IOException e) {
System.out.println(e);
}
return returnish;
}
private static String readFile(String targetFile) {
String returnString = "";
try {
File tempFile = new File(targetFile);
Scanner s = new Scanner(tempFile);
while (s.hasNextLine()) {
returnString = returnString + s.nextLine();
}
} catch(IOException e) {
// !
System.out.println(e);
}
return returnString;
}
private static void showGUI() {
JFrame frame = new JFrame("The Neverhood Restoration Project");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(new Dimension(1024, 600));
frame.setExtendedState(frame.MAXIMIZED_BOTH);
frame.getContentPane().setBackground(new Color(0xA64343));
File fileCheck = new File("C:/Program Files (x86)");
String returnString = null;
String rootDirectory = null;
if (fileCheck.exists()) {
rootDirectory = "C:/Program Files (x86)/DreamWorks Interactive";
String checkFile = rootDirectory+"/Neverhood/version.txt";
File tempFile = new File(checkFile);
if (tempFile.exists()) {
returnString = readFile(checkFile);
} else {
returnString = "It appears you do not have the Neverhood Restoration Project installed, or you are using an earlier version.";
}
} else {
rootDirectory = "C:/Program Files/DreamWorks Interactive";
String checkFile = rootDirectory+"/Neverhood/version.txt";
File tempFile = new File(checkFile);
if (tempFile.exists()) {
returnString = readFile(checkFile);
} else {
returnString = "It appears you do not have the Neverhood Restoration Project installed, or you are using an earlier version.";
}
}
if (returnString.equals(readURL("http://theneverhood.sourceforge.net/version.txt"))) {
returnString = "You are updated to the recent version!";
} else {
returnString = "It appears you're not updated.";
}
JLabel headerLabel = new JLabel("The Neverhood Restoration Project");
headerLabel.setHorizontalAlignment(JLabel.CENTER);
JPanel heapPanel = new JPanel();
heapPanel.setLayout(new BoxLayout(heapPanel, BoxLayout.PAGE_AXIS));
heapPanel.setPreferredSize(new Dimension(500, heapPanel.getPreferredSize().height));
JTextArea heapLabel = new JTextArea(50, 50);
heapLabel.setLineWrap(true);
heapLabel.setWrapStyleWord(true);
heapLabel.setEditable(false);
heapLabel.setBorder(BorderFactory.createEmptyBorder(10, 20, 10, 20));
heapLabel.setFont(new Font("Serif", Font.PLAIN, 14));
heapLabel.append("Current version: "+readURL("http://theneverhood.sourceforge.net/prettyversion.txt")+".\nInstalled version: "+readFile(rootDirectory+"/Neverhood/prettyversion.txt")+".\n"+returnString+"\n" +
"You can read the full version of the document to the left at http://theneverhood.sourceforge.net."
+ "\nBelow is the download button. Just click, choose your directory to save setup.exe in and enjoy!");
heapPanel.add(heapLabel);
try {
Font sFont = Font.createFont(Font.TRUETYPE_FONT, new File("DUGFB___.TTF"));
sFont = sFont.deriveFont(Font.PLAIN, 48);
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
ge.registerFont(sFont);
headerLabel.setFont(sFont);
} catch (FontFormatException | IOException e) {
System.out.println(e);
}
BufferedImage icoImage = null;
try {
icoImage = ImageIO.read(
frame.getClass().getResource("/nhood.bmp"));
} catch (IOException e) {
System.out.println(e);
}
frame.setIconImage(icoImage);
JEditorPane updateLog = new JEditorPane();
JScrollPane scrollPane = new JScrollPane(updateLog);
updateLog.setEditable(false);
try {
updateLog.setPage("http://theneverhood.sourceforge.net/");
} catch (IOException e) {
updateLog.setContentType("text/html");
updateLog.setText("<html>The application could not load the webpage.</html>");
}
frame.add(headerLabel, BorderLayout.NORTH);
frame.add(scrollPane);
frame.add(heapPanel, BorderLayout.EAST);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
showGUI();
}
});
}
}
In Java, public classes must be defined in their own file, having the same name (with a .java suffix) as the class name.
You defined a public class named definitiveVoid in the file UpdateMechanism.java. And you tried to put code directly in this class, outside of any method. That isn't valid Java.
Swing is hard and complex. Don't try to use it before knowing the basics of Java.
Moreover, classes, by convention, start with an uppercase letter in Java.