Error messages with Java Swing

Question

I have a query on handling error conditions with Java Swing.

I am using Netbeans to develop a simple Java Swing app. It is to load in a text file, then run calculati

Answer 1

when you catch the exception, run:

JOptionPane.showMessageDialog("File is corrupted. Please select a new file.");

Then display the file dialog again.

It's probably best to do this as a loop that continues while the the file is not valid. If there is a corruption, then rather than throwing an exception, set a boolean flag and loop as long as the flag is set. That way, when a good file is found, the while loop will terminate.

Example:

public static void main(String[] args){
    boolean goodFile = false;

    while (!goodFile){
        JFileChooser chooser = new JFileChooser();
        chooser.showOpenDialog();

        goodFile = processFile(chooser.getSelectedFile());
    }
}

private boolean processFile(File file){
    //do you stuff with the file

    //return true if the processing works properly, and false otherwise    
}