Unreported Exception Compiler Error

[cnixuser]

Hello,

I am posting reguarding some modifications I made to a text editor program that I wrote in my java class at my school today. The file I was modifying is a very simple java text editor with a "JMenuBar" object, with "JMenu" objects, such as "File" with "JMenuItem" objects such as "Save". The Modifications that I am attempting to make to the program are designed to give actual functionality to the "JMenuItems", starting with the "Save" object. I am implementing the functionality with ActionListener classes. I have run into an error that I am unsure how to correct while I was attempting to set up the FileWriter code I was planning to use to implement "Save". When I attempt to compile, I get the following error

/home/vontux/Swing2/src/Editor.java:55: unreported exception java.io.IOException; must be caught or declared to be thrown

Here is the portion of code that throws the compiler error:

 mi_File_Save.addActionListener( new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                //System.exit(0);
                //final JFileChooser fc = new JFileChooser();
                int returnVal = fc.showSaveDialog(Editor.this);
                SaveOutput(returnVal);//this line right here is what kicks out the error
                //String nfile;
 
 
                //final JFileChooser fc = new JFileChooser();
               // int returnVal = fc.showOpenDialog(e);
            }
        });//not part of class examples

And here is the method that is being called from the Actionlistener:

private void SaveOutput(int returnVal) throws IOException
    {
        try {
        String nfile;
        if(returnVal == JFileChooser.APPROVE_OPTION)
                {
                    nfile = fc.getSelectedFile().toString();
                    String text = jtaNotes.getText();
                    FileWriter fw = new FileWriter(nfile);
                    fw.close();
                }
        }
        catch(IOException SIOxcp)
        {
            JOptionPane.showMessageDialog(null,"Error","an IOException was Thrown",JOptionPane.ERROR_MESSAGE);
        }
 
    }

And here is the program in its entirety:

/*
 * Editor.java
 *
 * Created on February 13, 2007, 1:05 PM
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */
 
/**
 *
 * @author vontux
 */
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
import java.io.*;//not part of class example code
public class Editor extends JFrame {
    private JTextArea jtaNotes = new JTextArea(24,60);//it will only be able to scroll
    private JScrollPane jspNotes = new JScrollPane(jtaNotes);//pass component to the scroll area you want to be scrollable
    final JFileChooser fc = new JFileChooser();//not part of class code
 
    /** Creates a new instance of Editor */
    public Editor() throws java.io.IOException {
        setTitle("MyEditor");
 
        //adding the menus
        JMenuBar jmb = new JMenuBar();//where the JMenu's go
 
        JMenu m_file = new JMenu("File");
        JMenu m_Edit = new JMenu("Edit");
        JMenu m_Search = new JMenu("Search");
        JMenu m_Help = new JMenu("Help");
 
        JMenuItem mi_File_Exit = new JMenuItem("Exit");
 
        JMenuItem mi_File_Save = new JMenuItem("Save");
 
        JMenuItem mi_File_SaveAs = new JMenuItem("Save As");
 
        JMenuItem mi_File_Open = new JMenuItem("Open");
        mi_File_Exit.addActionListener( new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                System.exit(0);
 
            }
        });
 
        mi_File_Save.addActionListener( new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                //System.exit(0);
                //final JFileChooser fc = new JFileChooser();
                int returnVal = fc.showSaveDialog(Editor.this);
                SaveOutput(returnVal);//this line right here is what kicks out the error
                //String nfile;
 
 
                //final JFileChooser fc = new JFileChooser();
               // int returnVal = fc.showOpenDialog(e);
            }
        });//not part of class examples
        m_file.add(mi_File_Open);//not part of class examples
        m_file.add(mi_File_Save);//not part of class examples
        m_file.add(mi_File_SaveAs);//not part of class examples
        m_file.add(mi_File_Exit);//adds a menu item to the specified JMenu object
 
 
        jmb.add(m_file);//these add the Menu's to the JMenu
        jmb.add(m_Edit);
        jmb.add( m_Search);
        jmb.add(m_Help);
 
        setJMenuBar( jmb );//adding the JMenuBar object initializing it I suppose
 
        setBackground(Color.GREEN);//sets background of the form
 
        jtaNotes.setBackground(Color.GREEN);//sets bg color of the jtaNotes Object
        jtaNotes.setFont( new Font("Times New Roman", Font.BOLD, 14));
 
 
        getContentPane().add(jspNotes, BorderLayout.CENTER);//getContentPane() is a container which gives access to other methods
        //setSize(300,400);//sets a default size for the window
        //pack();//autoadjusts based on the content
 
        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);//allows you to close the jvm process by clicking the red x as opposed to simply hiding it
            }
        });
        pack();//autoadjusts based on the size of contents of it, in this case the size of the JScrollArea
        show();
    }
    public static void main(String[] args)
        throws java.io.IOException
    {
        try
        {
            new Editor();
        }
        catch(IOException IOxcp)
        {
            JOptionPane.showMessageDialog(null,"Error","an IOException was Thrown",JOptionPane.ERROR_MESSAGE);
        }
 
    }
    private void SaveOutput(int returnVal) throws IOException
    {
        try {
        String nfile;
        if(returnVal == JFileChooser.APPROVE_OPTION)
                {
                    nfile = fc.getSelectedFile().toString();
                    String text = jtaNotes.getText();
                    FileWriter fw = new FileWriter(nfile);
                    fw.close();
                }
        }
        catch(IOException SIOxcp)
        {
            JOptionPane.showMessageDialog(null,"Error","an IOException was Thrown",JOptionPane.ERROR_MESSAGE);
        }
 
    }
 
}

Please ignore the comments reguarding my academic class, they are meant for my Professor and other students reading my code. Any help that could be provided on this problem would be greatly appreciated, because I am quite honestly stumped, as whenever I try to apply the "throws IOException" statement directly to the actionListener, there is a compiler error, I thought by applying it to the method, I would be eliminating the problem. So thanks in advance to anyone who helps me out here.

[hirak1984]

First of all either delete the "throws IOException " line,
or rewrite catch as

catch(Exception SIOxcp)

both place IOException is not the syntax.Your errors will get resolved,hopefully.

/home/vontux/Swing2/src/Editor.java:55: unreported exception java.io.IOException; must be caught or declared to be thrown

private void SaveOutput(int returnVal) throws IOException
{
try {
String nfile;
if(returnVal == JFileChooser.APPROVE_OPTION)
{
nfile = fc.getSelectedFile().toString();
String text = jtaNotes.getText();
FileWriter fw = new FileWriter(nfile);
fw.close();
}
}
catch(IOException SIOxcp)
{
JOptionPane.showMessageDialog(null,"Error","an IOException was Thrown",JOptionPane.ERROR_MESSAGE);
}
 
}

.

dont try to add any throws after actionListener.Because you are overriding the function,so you cannot change the signature according to your need.That is not petmitted.

whenever I try to apply the "throws IOException" statement directly to the actionListener, there is a compiler error, I thought by applying it to the method, I would be eliminating the problem. So thanks in advance to anyone who helps me out here.

[cnixuser]

Thank you, your deletion and modification suggestions solved the problem. Just out of curiosity, how do the "throws java.io.IOException" statements override the actionListener?

[r035198x]

Thank you, your deletion and modification suggestions solved the problem. Just out of curiosity, how do the "throws java.io.IOException" statements override the actionListener?

The throws clause does not override anything. When writing code that can throw an exception which you want to handle, either put that code in a try block and catch the exception or declare that block of code as throws...whatever exception. Do not use both.

[hirak1984]

it does not override actionListener.

here you are overriding actionListener when you are using it in your code.
actionListener is defined in an interface which you access by writing

implements actionListener
 

at appropriate places.

Thank you, your deletion and modification suggestions solved the problem. Just out of curiosity, how do the "throws java.io.IOException" statements override the actionListener?