Code Comments

import java.io.*;
import java.util.*;
 
public class MultiFileReader implements Iterable<String>
{
    private ArrayList<File> _files;
    private boolean _filesHaveHeaders;
    private int _numSkipLines;
 
    public MultiFileReader(String dir, String filePattern, boolean filesHaveHeaders, int numSkipLines) throws Exception
    {
	_files = Files.GetFilesInDirRecursively(dir, filePattern);
	_filesHaveHeaders = filesHaveHeaders;
	_numSkipLines = numSkipLines;
    }
 
    public MultiFileIterator iterator()
    {
	return new MultiFileIterator();
    }
 
    public class MultiFileIterator implements Iterator<String>
    {
	private ArrayList<File> _iteratorFiles;
	private Iterator<String> _currentFileIterator;
 
	public String HeaderLine = "";
 
	public MultiFileIterator()
	{
	    _iteratorFiles = new ArrayList<File>(_files);
	}
 
	private boolean IterateFile() throws Exception
	{
	    while (_iteratorFiles.size() > 0)
	    {
		_currentFileIterator = new BigFile(_iteratorFiles.remove(0)).iterator();
 
		if (_currentFileIterator.hasNext())
		{
		    if (_filesHaveHeaders)
			HeaderLine = _currentFileIterator.next();
 
		    for (int i=0; i<_numSkipLines; i++)
			if (_currentFileIterator.hasNext())
			    _currentFileIterator.next();
 
		    if (_currentFileIterator.hasNext())
			return true;
		}
	    }
 
	    return false;
	}
 
	public boolean hasNext()
	{
		try
		{
		    if (_currentFileIterator == null)
			return IterateFile();
 
		    if (_currentFileIterator.hasNext())
			return true;
		    else
			return IterateFile();
		}
		catch (Exception ex)
		{
		    ex.printStackTrace();
		    return false;
		}
	    }
 
	public String next()
	{
	    return _currentFileIterator.next();
	}
 
	public void remove()
	{
	    _currentFileIterator.remove();
	}
    }
}

MultiFileReader reader = new MultiFileReader("C:\\Temp\\", "*.txt", false, 0);
 
for (String line : reader)
    System.out.println(line);