//Sample11_02.java

import java.io.File;

class Sample11_02{

    static final int MAX_SIZE = 30;
    static File[] result = null;
    static int i = 0;

    public static void main(String[] args){

        String strDir = "parent";
        result = new File[MAX_SIZE];

        File dir = new File(strDir);
        if(dir.exists()){
            addList(dir);
        }

        int j=0;
        for(; j < result.length; j++){
            File file = result[j];
            if(file!=null){
                String strPath =
                      String.format("%02d %s", j, file.getPath());
                System.out.println(strPath);
            }else{
                break;
            }
        }
        System.out.println("Hit: " + j);

    }
    private static void addList(File dir){

        result[i]= dir;
        i++;
        if(dir.isDirectory()){
            File[] files = dir.listFiles();
            if(files!=null){
                for(File file : files){
                    addList(file);
                }
            }
        }
    }
}