Problem mit IOException

[Janeirio]

Hallo, ehrlich gesagt weiß ich garnicht so sehr wo bei mir das Problem liegt...
Wenn ich das Programm starten will dann tritt folgende Fehlermeldung auf:

GuestAcountGenerator.java:146:24: error: unreported exception IOException; must be caught or declared to be thrown

Ich hoffe ihr könnt mir weiter helfen.

[JAVA=42] import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.util.Random;

public class GuestAcountGenerator extends Frame {
// Anfang Attribute

private Label label1 = new Label();
private Label label2 = new Label();
private Label label3 = new Label();
private Label label4 = new Label();
private Label label5 = new Label();
private Label label6 = new Label();
private Label label7 = new Label();
private NumberField numberField1 = new NumberField();
private NumberField numberField2 = new NumberField();
private NumberField numberField3 = new NumberField();
private JCheckBox jCheckBox1 = new JCheckBox();
private Button generate = new Button();

// Ende Attribute

public GuestAcountGenerator(String title) {
// Frame-Initialisierung
super(title);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent evt) { dispose(); }
});
int frameWidth = 295;
int frameHeight = 269;
setSize(frameWidth, frameHeight);
Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
int x = (d.width - getSize().width) / 2;
int y = (d.height - getSize().height) / 2;
setLocation(x, y);
setResizable(false);
Panel cp = new Panel(null);
add(cp);
// Anfang Komponenten

numberField1.setBounds(112, 24, 81, 25);
numberField1.setText("");
cp.add(numberField1);
label1.setBounds(24, 22, 83, 33);
label1.setText("Laufende Nr.");
cp.add(label1);
label2.setBounds(16, 70, 91, 33);
label2.setText("Anzahl Acounts");
cp.add(label2);
numberField2.setBounds(112, 72, 81, 25);
numberField2.setText("");
cp.add(numberField2);
generate.setBounds(88, 185, 105, 41);
generate.setLabel("generate");

generate.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
generate_ActionPerformed(evt);
}
});
generate.setCursor(new Cursor(Cursor.HAND_CURSOR));
cp.add(generate);
label3.setBounds(16, 118, 91, 33);
label3.setText("Anzahl Stunden");
cp.add(label3);
numberField3.setBounds(112, 120, 81, 25);
numberField3.setText("");
cp.add(numberField3);
jCheckBox1.setBounds(120, 149, 17, 17);
jCheckBox1.setText("");
jCheckBox1.setOpaque(false);
jCheckBox1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
jCheckBox1_ActionPerformed(evt);
}
});
jCheckBox1.setSelected(false);
cp.add(jCheckBox1);
label4.setBounds(40, 142, 91, 33);
label4.setText("unbegrenzt");
cp.add(label4);
label5.setBounds(200, 24, 67, 25);
label5.setText("Ausfüllen !");
label5.setFont(new Font("Dialog", Font.BOLD, 12));
label5.setVisible(false);
cp.add(label5);
label6.setBounds(200, 72, 67, 25);
label6.setText("Ausfüllen !");
label6.setVisible(false);
label6.setFont(new Font("Dialog", Font.BOLD, 12));
cp.add(label6);
label7.setBounds(200, 120, 67, 25);
label7.setText("Ausfüllen !");
label7.setVisible(false);
label7.setFont(new Font("Dialog", Font.BOLD, 12));
cp.add(label7);
// Ende Komponenten

setVisible(true);
} // end of public GuestAcountGenerator

boolean check = false;
int feldNummer;
int feldAnzahl;
int feldStunden;

// Anfang Methoden
public void generate_ActionPerformed(ActionEvent evt){
try {
feldNummer = numberField1.getInt();
label5.setVisible(false);
} catch(Exception e) {;
label5.setVisible(true);
}
try {
feldAnzahl = numberField2.getInt();
label6.setVisible(false);
} catch(Exception e) {;
label6.setVisible(true);
}
try {
feldAnzahl = numberField3.getInt();
label7.setVisible(false);

} catch(Exception e) {;
if (check == false) {
label7.setVisible(true);
} // end of if
}
if (check == true) {
feldAnzahl = 0;
} // end of if

CsvCreate uebergabe = new CsvCreate();
uebergabe.erstellen(feldAnzahl);


System.out.println(feldAnzahl);
} // end of generate_ActionPerformed

public void jCheckBox1_ActionPerformed(ActionEvent evt) {
if (check == false) {
check = true;
numberField3.setVisible(false);
label7.setVisible(false);
} // end of if
else {
check = false;
numberField3.setVisible(true);
label7.setVisible(false);
} // end of if-else
} // end of jCheckBox1_ActionPerformed

public String getSelectedRadioButton(ButtonGroup bg) {
for (java.util.Enumeration<AbstractButton> e = bg.getElements(); e.hasMoreElements() {
AbstractButton b = e.nextElement();
if (b.isSelected()) return b.getText();
}
return null;
}

public static void main(String[] args)
{
new GuestAcountGenerator("GuestAcountGenerator");

} // end of main

} // end of class GuestAcountGenerator [/code]


[JAVA=42] import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Scanner;

public class CsvCreate {

public void erstellen(int feldAnzahl)throws IOException
{
FileWriter fw = new FileWriter("WriteTest.csv");
PrintWriter out = new PrintWriter(fw);
Scanner scan = new Scanner(System.in);
Passwordgenerator zufall = new Passwordgenerator();

int nummer = 1;
int anzahl = 1;

for (int i = 0; i <= anzahl ; i++ ) {
String name = "PXLGuest" + nummer;
out.print(name);
out.print(",");
out.print(zufall.generieren());
out.print(",");
out.print("0");
out.println("");
nummer++;
} // end of for

out.flush();
out.close();
fw.close();

} // end of class CsvCreate
}
[/code]

 

[SlaterB]

die mögliche Exception muss beim Aufruf mit try/catch abfangen werden,
was dir hoffentlich was sagt, anderseits angesichts des Problems an sich vielleicht doch nicht,

bitte entsprechendes Kapitel in einem Lehrbuch lesen, etwa
Galileo Computing :: Java ist auch eine Insel - 6 Exceptions

 

[Janeirio]

vielen dank für die schnelle Antwort, hat mir weiter geholfen.