Hallo! Habe folgendes programmiert
ich möchte jetzt dass wenn ich den normButton drücke die Methode zaehle ausgeführt wird.
Wenn ich versuche diese da einzufügen zB so:
kommt eine Fehlermeldung: Eclipse schlägt dann das vor:
Und dann kommt folgende Fehlermeldung : Exception IOException is not compatible with throws clause in ActionListener.actionPerformed
(ActionEvent)
Kurz gesagt: Kann ich den Bufferedreader so nicht verwenden? Wenn dem so ist wie lese ich dann die Daten aus der Datei?
Code:
public class LagerWin extends JPanel
implements ActionListener {
/**
*
*/
private static final long serialVersionUID = 1L;
static private final String newline = "\n";
JButton openButton, saveButton, spaltButton, normButton;
JTextArea log;
JFileChooser fc;
String path;
public static int zaehle() throws java.io.IOException{
BufferedReader lese = new BufferedReader(new FileReader("e:/java/Lagerspiegel_K2381.lst"));
String zaehleString;
int i=0;
while ((zaehleString = lese.readLine()) != null)
{
i++;
}
return i;
}
public LagerWin() {
super(new BorderLayout());
//Create the log first, because the action listeners
//need to refer to it.
log = new JTextArea(5,20);
log.setMargin(new Insets(5,5,5,5));
log.setEditable(false);
JScrollPane logScrollPane = new JScrollPane(log);
//Create a file chooser
fc = new JFileChooser();
//Uncomment one of the following lines to try a different
//file selection mode. The first allows just directories
//to be selected (and, at least in the Java look and feel,
//shown). The second allows both files and directories
//to be selected. If you leave these lines commented out,
//then the default mode (FILES_ONLY) will be used.
//
//fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
//fc.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
//Create the open button. We use the image from the JLF
//Graphics Repository (but we extracted it from the jar).
openButton = new JButton("Open a File...");
openButton.addActionListener(this);
//Create the normButton
normButton = new JButton("NormalMaterial");
normButton.addActionListener(this);
//Create the save button. We use the image from the JLF
//Graphics Repository (but we extracted it from the jar).
spaltButton = new JButton("Spalt");
spaltButton.addActionListener(this);
//For layout purposes, put the buttons in a separate panel
JPanel buttonPanel = new JPanel(); //use FlowLayout
buttonPanel.add(openButton);
buttonPanel.add(normButton);
buttonPanel.add(spaltButton);
//Add the buttons and the log to this panel.
add(buttonPanel, BorderLayout.PAGE_START);
add(logScrollPane, BorderLayout.CENTER);
}
public void actionPerformed(ActionEvent e) {
//Handle open button action.
if (e.getSource() == openButton) {
int returnVal = fc.showOpenDialog(LagerWin.this);
if (returnVal == JFileChooser.APPROVE_OPTION) {
File file = fc.getSelectedFile();
//This is where a real application would open the file.
log.append(file.getPath() + " wurde geöffnet" + newline);
path = file.getPath();
} else {
log.append("Abbruch durch Benutzer" + newline);
}
log.setCaretPosition(log.getDocument().getLength());
//Handle save button action.
} else if (e.getSource() == normButton) {
log.append("Norm");
log.append("Reihenanzzahl:");}
else if (e.getSource()== spaltButton){
log.append("Spalt");
}
}
/** Returns an ImageIcon, or null if the path was invalid. */
protected static ImageIcon createImageIcon(String path) {
java.net.URL imgURL = LagerWin.class.getResource(path);
if (imgURL != null) {
return new ImageIcon(imgURL);
} else {
System.err.println("Couldn't find file: " + path);
return null;
}
}
/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
*/
private static void createAndShowGUI() {
//Make sure we have nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true);
JDialog.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
JFrame frame = new JFrame("FileChooserDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
JComponent newContentPane = new LagerWin();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) throws IOException {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
ich möchte jetzt dass wenn ich den normButton drücke die Methode zaehle ausgeführt wird.
Wenn ich versuche diese da einzufügen zB so:
Code:
else if (e.getSource() == normButton) {
log.append("Norm");
int i = zaehle();
Code:
public void actionPerformed(ActionEvent e) throws IOException
(ActionEvent)
Kurz gesagt: Kann ich den Bufferedreader so nicht verwenden? Wenn dem so ist wie lese ich dann die Daten aus der Datei?