Question

I need to display a static folder hierarchy in java. I already have a folder class defined and have to use the same. No use of File class is allowed! Class folder is:

class Folder
{
    boolean isFile;
    String folderName;
    List<Folder> subFolders;
}

The code i am trying to use is :

class LisF
{
    public static void main(String args[])
    {
        Folder a=new Folder("C:/hello");
        Folder b=new Folder("C:/one");
        Folder c=new Folder("C:/two");
        a.subFolders.add(b);
        b.subFolders.add(c);
        Iterator itr = a.subFolders.iterator();
        Iterator itr1= b.subFolders.iterator();

        while(itr.hasNext()) {
            Object element = itr.next();
            //System.out.print("The list is "+(Folder)element.putFName());
            System.out.println("The lis is "+element);
        }

    }

}

It runs and gives the output as Folder@1234 which no doubt gives the name of the object. But i need the name of the string passed i.e to display the subfolders of hello it should display one and subFolders of one should display two! But instead i am getting the object names!!!!

Answer 1

You should implement the toString method in the classes you want/need to print the objects as Strings. In this case, you need to implement it in the Folder class:

class Folder {

    //class definition...

    @Override
    public String toString() {
        //implementation sample
        return this.folderName;
    }
}