How to make a class visible in another class?

My problem : In a ReadFile class, I have a public Module ReadTheFileGetTheModuleName(String fichier) method which has to return an object from a Module Class.

In the method, I create a module from the Module Class but when I want to return it, I have an error : module cannot be resolved to a variable.

Here is my code:

public  Module ReadTheFileGetTheModuleName(String fichier){
            try{
                InputStream ips=new FileInputStream(fichier); 
                InputStreamReader ipsr=new InputStreamReader(ips);
                BufferedReader br=new BufferedReader(ipsr);
                String ligne;

                while ((ligne=br.readLine())!=null){
                    if (ligne.contains("module"))
                    {
                        /*String[] st = ligne.split(ligne, ' ');
                        System.out.println("Nom = "+st[1]);*/
                        int longueur = ligne.length();
                        ligne = ligne.substring(ligne.indexOf(" "));
                        ligne = ligne.trim();
                        System.out.println(ligne);

                        //putting the name in a Module Class
                        Module module = new Module();
                        module.setName(ligne);  
                        System.out.println("nom du module : "+module.getName());
                        module.setFichier(fichier);
                        System.out.println("nom du fichier lié au module : "+module.getFichier());

                    }

                    chaine+=ligne+"\n";

                }
                return module; //Here is the line were I have an error
                br.close();

            }       
            catch (Exception e){
                System.out.println(e.toString());
            }
**

Do someone knows the possible mistake I have made ?

Jon Skeet
people
quotationmark

The problem is that you're declaring the module variable in a nested scope, but then trying to use it outside that scope:

while (...) {
    if (...) {
        Module module = ...;
    }
}
return module;

What would you expect to happen if the while or if conditions never evaluated to true? If you want to return null (or some other default value) in that case, that's easy - just declare it before the loop:

Module module = ...;
while (...) {
    if (...) {
        module = ...;
    }
}
return module;

Or perhaps you should really be moving the return statement inside the if statement:

while (...) {
    if (...) {
        Module module = ...;
        ...
        return module;
    }
}
// Work out what you want to do here

This has nothing to do with different classes being involved - it's just about scope.

people

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