Domanda su JFileChooser

[fermat]

io ho questo filechooser:

    private void jMenuItem1KeyPressed(java.awt.event.KeyEvent evt) {                                      
        JFileChooser fc = new JFileChooser();
        FileFilter csvFilter = new FileNameExtensionFilter("File CSV", "csv");
        FileFilter txtFilter = new FileNameExtensionFilter("File TXT", "txt");
        fc.addChoosableFileFilter(csvFilter);
        fc.addChoosableFileFilter(txtFilter);
        int returnVal = fc.showSaveDialog(this);
        if (returnVal == JFileChooser.APPROVE_OPTION) {
            File f = fc.getSelectedFile();
            FileFilter selectedFilter = fc.getFileFilter();
            if (f.getName().indexOf('.') == -1) {
                if (selectedFilter == csvFilter) {
                    f = new File(f.getPath() + ".csv");
                } else if (selectedFilter == txtFilter) {
                    f = new File(f.getPath() + ".txt");
                }
            }
            try {
                FileWriter file = new FileWriter(f, true);
                PrintWriter out = new PrintWriter(file);
                out.println(jTextArea1.getText() + "\n" + "Tot entrate: " + jTextField9.getText() + "\nTot uscite: " + jTextField10.getText() + "\nTOT: " + jTextField15.getText() + "\nTot operazioni: " + jTextField16.getText());
                out.close();
            } catch (IOException e) {
                JOptionPane.showMessageDialog(this, e, "ERRORE", JOptionPane.ERROR_MESSAGE);
            }
        }
}

come vedete è inserito in un evento.
per farlo funzionare ho importato questi package:
import javax.swing.*;
import java.io.*;
import javax.swing.filechooser.FileFilter;
import javax.swing.filechooser.FileNameExtensionFilter;

ora, visto che ho vari eventi con questo codice ho pensato di creare un file a se con quel codice da richiamare nei vari eventi.
ho importato gli stesso package:

package banca;

import javax.swing.*;
import java.io.*;
import javax.swing.filechooser.FileFilter;
import javax.swing.filechooser.FileNameExtensionFilter;

public class AreaFileChooser extends JFrame {
        JFileChooser fc = new JFileChooser();
        FileFilter csvFilter = new FileNameExtensionFilter("File CSV", "csv");
        FileFilter txtFilter = new FileNameExtensionFilter("File TXT", "txt");
        fc.addChoosableFileFilter(csvFilter);
        fc.addChoosableFileFilter(txtFilter);
        int returnVal = fc.showSaveDialog(this);
        if (returnVal == JFileChooser.APPROVE_OPTION) {
            File f = fc.getSelectedFile();
            FileFilter selectedFilter = fc.getFileFilter();
            if (f.getName().indexOf('.') == -1) {
                if (selectedFilter == csvFilter) {
                    f = new File(f.getPath() + ".csv");
                } else if (selectedFilter == txtFilter) {
                    f = new File(f.getPath() + ".txt");
                }
            }
            try {
                FileWriter file = new FileWriter(f, true);
                PrintWriter out = new PrintWriter(file);
                out.println(TArea.getJarea().getText() + "\n" + "Tot entrate: " + TArea.getfield9().getText() + "\nTot uscite: " + TArea.getfield10().getText() + "\nTOT: " + TArea.getfield15().getText() + "\nTot operazioni: " + TArea.getfield16().getText());
                out.close();
            } catch (IOException e) {
                JOptionPane.showMessageDialog(this, e, "ERRORE", JOptionPane.ERROR_MESSAGE);
            }
        }
}

mi da però questo errore di compilazione:

/media/MATTE/Banca/src/banca/AreaFileChooser.java:12: <identifier> expected
        fc.addChoosableFileFilter(csvFilter);
/media/MATTE/Banca/src/banca/AreaFileChooser.java:12: <identifier> expected
        fc.addChoosableFileFilter(csvFilter);
/media/MATTE/Banca/src/banca/AreaFileChooser.java:13: <identifier> expected
        fc.addChoosableFileFilter(txtFilter);
/media/MATTE/Banca/src/banca/AreaFileChooser.java:13: <identifier> expected
        fc.addChoosableFileFilter(txtFilter);
/media/MATTE/Banca/src/banca/AreaFileChooser.java:15: illegal start of type
        if (returnVal == JFileChooser.APPROVE_OPTION) {
/media/MATTE/Banca/src/banca/AreaFileChooser.java:15: <identifier> expected
        if (returnVal == JFileChooser.APPROVE_OPTION) {
/media/MATTE/Banca/src/banca/AreaFileChooser.java:15: ';' expected
        if (returnVal == JFileChooser.APPROVE_OPTION) {
/media/MATTE/Banca/src/banca/AreaFileChooser.java:15: illegal start of type
        if (returnVal == JFileChooser.APPROVE_OPTION) {
/media/MATTE/Banca/src/banca/AreaFileChooser.java:15: ';' expected
        if (returnVal == JFileChooser.APPROVE_OPTION) {
9 errors
/media/MATTE/Banca/nbproject/build-impl.xml:528: The following error occurred while executing this line:
/media/MATTE/Banca/nbproject/build-impl.xml:261: Compile failed; see the compiler error output for details.

perchè??

[Alex'87]

Originariamente inviato da fermat

public class AreaFileChooser extends JFrame {
        JFileChooser fc = new JFileChooser();
        FileFilter csvFilter = new FileNameExtensionFilter("File CSV", "csv");
        FileFilter txtFilter = new FileNameExtensionFilter("File TXT", "txt");
        fc.addChoosableFileFilter(csvFilter);
        fc.addChoosableFileFilter(txtFilter);
        int returnVal = fc.showSaveDialog(this);
        if (returnVal == JFileChooser.APPROVE_OPTION) {
            File f = fc.getSelectedFile();
            FileFilter selectedFilter = fc.getFileFilter();
            if (f.getName().indexOf('.') == -1) {
                if (selectedFilter == csvFilter) {
                    f = new File(f.getPath() + ".csv");
                } else if (selectedFilter == txtFilter) {
                    f = new File(f.getPath() + ".txt");
                }
            }
            try {
                FileWriter file = new FileWriter(f, true);
                PrintWriter out = new PrintWriter(file);
                out.println(TArea.getJarea().getText() + "\n" + "Tot entrate: " + TArea.getfield9().getText() + "\nTot uscite: " + TArea.getfield10().getText() + "\nTOT: " + TArea.getfield15().getText() + "\nTot operazioni: " + TArea.getfield16().getText());
                out.close();
            } catch (IOException e) {
                JOptionPane.showMessageDialog(this, e, "ERRORE", JOptionPane.ERROR_MESSAGE);
            }
        }
}

perchè??

Quel codice va messo all'interno di un metodo e non direttamente nella classe.

[fermat]

nn ci avevo minimamente pensato.
ho fatto così:

package banca;

import javax.swing.*;
import java.io.*;
import javax.swing.filechooser.FileFilter;
import javax.swing.filechooser.FileNameExtensionFilter;

public class AreaFileChooser extends JFrame {

    public static void salva() {
        JFileChooser fc = new JFileChooser();
        FileFilter csvFilter = new FileNameExtensionFilter("File CSV", "csv");
        FileFilter txtFilter = new FileNameExtensionFilter("File TXT", "txt");
        fc.addChoosableFileFilter(csvFilter);
        fc.addChoosableFileFilter(txtFilter);
        int returnVal = fc.showSaveDialog(this);
        if (returnVal == JFileChooser.APPROVE_OPTION) {
            File f = fc.getSelectedFile();
            FileFilter selectedFilter = fc.getFileFilter();
            if (f.getName().indexOf('.') == -1) {
                if (selectedFilter == csvFilter) {
                    f = new File(f.getPath() + ".csv");
                } else if (selectedFilter == txtFilter) {
                    f = new File(f.getPath() + ".txt");
                }
            }
            try {
                FileWriter file = new FileWriter(f, true);
                PrintWriter out = new PrintWriter(file);
                out.println(TArea.getJarea().getText() + "\n" + "Tot entrate: " + TArea.getfield9().getText() + "\nTot uscite: " + TArea.getfield10().getText() + "\nTOT: " + TArea.getfield15().getText() + "\nTot operazioni: " + TArea.getfield16().getText());
                out.close();
            } catch (IOException e) {
                JOptionPane.showMessageDialog(this, e, "ERRORE", JOptionPane.ERROR_MESSAGE);
            }
        }
    }
}

ottenendo questi due errori:

/Volumes/MATTE/Banca/src/banca/AreaFileChooser.java:16: non-static variable this cannot be referenced from a static context
        int returnVal = fc.showSaveDialog(this);
/Volumes/MATTE/Banca/src/banca/AreaFileChooser.java:33: non-static variable this cannot be referenced from a static context
                JOptionPane.showMessageDialog(this, e, "ERRORE", JOptionPane.ERROR_MESSAGE);
2 errors
/Volumes/MATTE/Banca/nbproject/build-impl.xml:528: The following error occurred while executing this line:
/Volumes/MATTE/Banca/nbproject/build-impl.xml:261: Compile failed; see the compiler error output for details.

ho fatto un pò di prove ma ogni volta mi esce fuori un altro errore.
il metodo l'ho messo statico perchè lo devo richiamare in un altro file.

[fermat]

risolto.
ho messo fc al posto di this.
adesso funge tutto!
grazie!