CODEWITHSUNDEEP
java-me
JohnH
JohnH

Reputation: 27

How to print all files in a directory including subdirectories without recursion in j2me

i am working on an mobile application(using j2me), my requirement is to print all files in a directory including all its sub-directories without recursion,i already done it using recursion my code for recursion is here

 public void pf1(String base_path1) throws IOException{

 FileConnection fc1=(FileConnection) Connector.open(base_path1,Connector.READ_WRITE);
 Enumeration filelist=fc1.list();
 String filename;
 while(filelist.hasMoreElements()){

 filename=(String)filelist.nextElement();
 fc1=(FileConnection)Connector.open(base_path1+filename,Connector.READ_WRITE);
 if(!fc1.isDirectory()){
     TotalFiles[TotalFileCount]=filename;
     TotalFileCount++;
     //System.out.println(filename);
 }
 else if(fc1.isDirectory()){

 pf1(base_path1+filename);

 }
 }


System.out.println(TotalFileCount);

}

please help, if any. Thanks in advance

Upvotes: 0

Views: 748

Answers (1)

Jeff Foster
Jeff Foster

Reputation: 44706

Make the stack explicit. I've done this in pseudo-code as this sounds a little home-worky! Your current structure is a little like this:

public void List(Directory directory) {
    forevery file in directory
       if (isDirectory(file)) List(file)
       else print(file) // recursion uses a stack
}

Instead you can make the call-stack explicit using your own stack. The recursion becomes replaced with a while loop.

public void List(Directory directory) {
    Stack directories = new Stack();
    directories.push(directory);

    while(!directories.Empty()) {
      Directory dir = directories.pop();

      forevery file in dir
         if (IsDirectory(file)) directories.push(file)
         else print(file);
    }
}

Upvotes: 3

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