public static  void readersAsText(Reader r1,
    String name1,
    Reader r2,
    String name2,
    List diffs) throws IOException 
{
        LineNumberReader reader1 = new LineNumberReader(r1);
        LineNumberReader reader2 = new LineNumberReader(r2);
        String line1 = reader1.readLine();
        String line2 = reader2.readLine();
        while (line1 != null && line2 != null)
        {
            if (!line1.equals(line2))
            {
                diffs.add("File \"" + name1 + "\" and file \"" +
                    name2 + "\" differ at line " + reader1.getLineNumber() +
                    ":" + "\n" + line1 + "\n========\n" + line2);
                break;
            }
            line1 = reader1.readLine();
            line2 = reader2.readLine();
        }
        if (line1 == null && line2 != null)
            diffs.add("File \"" + name2 + "\" has extra lines at line " +
                reader2.getLineNumber() + ":\n" + line2);
        if (line1 != null && line2 == null)
            diffs.add("File \"" + name1 + "\" has extra lines at line " +
                reader1.getLineNumber() + ":\n" + line1);
}