diff --git a/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/Application.java b/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/Application.java
index ad87a7d..824b74c 100644
--- a/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/Application.java
+++ b/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/Application.java
@@ -7,10 +7,8 @@
 import ch.heigvd.res.labio.interfaces.IFileVisitor;
 import ch.heigvd.res.labio.quotes.QuoteClient;
 import ch.heigvd.res.labio.quotes.Quote;
-import java.io.File;
-import java.io.IOException;
-import java.io.StringWriter;
-import java.io.Writer;
+
+import java.io.*;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 import org.apache.commons.io.FileUtils;
@@ -90,6 +88,7 @@ public void fetchAndStoreQuotes(int numberOfQuotes) throws IOException {
        * one method provided by this class, which is responsible for storing the content of the
        * quote in a text file (and for generating the directories based on the tags).
        */
+      storeQuote(quote, "quote-" + i + ".utf8");
       LOG.info("Received a new joke with " + quote.getTags().size() + " tags.");
       for (String tag : quote.getTags()) {
         LOG.info("> " + tag);
@@ -123,7 +122,18 @@ void clearOutputDirectory() throws IOException {
    * @throws IOException 
    */
   void storeQuote(Quote quote, String filename) throws IOException {
-    throw new UnsupportedOperationException("The student has not implemented this method yet.");
+    String filePath = WORKSPACE_DIRECTORY;
+
+    for (String tag : quote.getTags())
+      filePath += "/" + tag;
+
+    File file = new File(filePath);
+    file.mkdirs();
+
+    OutputStreamWriter outputStreamWriter = new OutputStreamWriter(new FileOutputStream(filePath + "/" + filename), "UTF-8");
+    outputStreamWriter.write(quote.getQuote());
+    outputStreamWriter.flush();
+    outputStreamWriter.close();
   }
   
   /**
@@ -140,6 +150,12 @@ public void visit(File file) {
          * of the the IFileVisitor interface inline. You just have to add the body of the visit method, which should
          * be pretty easy (we want to write the filename, including the path, to the writer passed in argument).
          */
+        try {
+          writer.write(file.getPath() + "\n");
+          writer.flush();
+        } catch (IOException exception) {
+          throw  new RuntimeException(exception);
+        }
       }
     });
   }
diff --git a/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/Utils.java b/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/Utils.java
index c8a3a5a..c6e1ff8 100644
--- a/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/Utils.java
+++ b/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/Utils.java
@@ -20,7 +20,22 @@ public class Utils {
    * contain any line separator, then the first element is an empty string.
    */
   public static String[] getNextLine(String lines) {
-    throw new UnsupportedOperationException("The student has not implemented this method yet.");
+    String result[] = new String[2];
+    result[0] = "";
+    result[1] = lines;
+    int count = 0;
+
+    while (lines.charAt(count) != '\r' && lines.charAt(count) != '\n')
+      if(++count == lines.length())
+        return result;
+
+    if(count < (lines.length() - 1) && lines.charAt(count + 1) == '\n')
+      count++;
+
+    result[0] = lines.substring(0, ++count);
+    result[1] = lines.substring(count);
+
+    return result;
   }
 
 }
diff --git a/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/explorers/DFSFileExplorer.java b/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/explorers/DFSFileExplorer.java
index 83f8e61..b74ee7d 100644
--- a/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/explorers/DFSFileExplorer.java
+++ b/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/explorers/DFSFileExplorer.java
@@ -3,6 +3,9 @@
 import ch.heigvd.res.labio.interfaces.IFileExplorer;
 import ch.heigvd.res.labio.interfaces.IFileVisitor;
 import java.io.File;
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.logging.Level;
 
 /**
  * This implementation of the IFileExplorer interface performs a depth-first
@@ -16,7 +19,22 @@ public class DFSFileExplorer implements IFileExplorer {
 
   @Override
   public void explore(File rootDirectory, IFileVisitor vistor) {
-    throw new UnsupportedOperationException("The student has not implemented this method yet.");
+    vistor.visit(rootDirectory);
+
+    if(!rootDirectory.exists())
+      return;
+
+    File[] files = rootDirectory.listFiles();
+
+    Arrays.sort(files);
+
+    for (File file :
+            files) {
+      if(file.isFile())
+        vistor.visit(file);
+      if(file.isDirectory())
+        explore(file, vistor);
+    }
   }
 
 }
diff --git a/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/filters/FileNumberingFilterWriter.java b/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/filters/FileNumberingFilterWriter.java
index 976c946..2c636aa 100644
--- a/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/filters/FileNumberingFilterWriter.java
+++ b/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/filters/FileNumberingFilterWriter.java
@@ -19,23 +19,38 @@ public class FileNumberingFilterWriter extends FilterWriter {
 
   private static final Logger LOG = Logger.getLogger(FileNumberingFilterWriter.class.getName());
 
+  private char previousCharacter = '\0',
+               currentCharacter = '\0';
+  private int  counter = 0;
+
   public FileNumberingFilterWriter(Writer out) {
     super(out);
   }
 
   @Override
   public void write(String str, int off, int len) throws IOException {
-    throw new UnsupportedOperationException("The student has not implemented this method yet.");
+    for (int i = off; i < off + len; i++)
+      write(str.charAt(i));
   }
 
   @Override
   public void write(char[] cbuf, int off, int len) throws IOException {
-    throw new UnsupportedOperationException("The student has not implemented this method yet.");
+    for (int i = off; i < off + len; i++)
+      write(cbuf[i]);
   }
 
   @Override
   public void write(int c) throws IOException {
-    throw new UnsupportedOperationException("The student has not implemented this method yet.");
+    currentCharacter = (char) c;
+    if (previousCharacter == '\0' || (currentCharacter != '\n' && previousCharacter == '\r'))
+      out.write(++counter + "\t" + currentCharacter);
+    else
+      out.write(currentCharacter);
+
+    if(currentCharacter == '\n')
+      out.write(++counter + "\t");
+
+    previousCharacter = currentCharacter;
   }
 
 }
diff --git a/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/filters/UpperCaseFilterWriter.java b/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/filters/UpperCaseFilterWriter.java
index 0f41a5d..e806ac4 100644
--- a/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/filters/UpperCaseFilterWriter.java
+++ b/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/filters/UpperCaseFilterWriter.java
@@ -16,17 +16,20 @@ public UpperCaseFilterWriter(Writer wrappedWriter) {
 
   @Override
   public void write(String str, int off, int len) throws IOException {
-    throw new UnsupportedOperationException("The student has not implemented this method yet.");
+    str = str.toUpperCase();
+    super.write(str, off, len);
   }
 
   @Override
   public void write(char[] cbuf, int off, int len) throws IOException {
-    throw new UnsupportedOperationException("The student has not implemented this method yet.");
+    for (int character = 0; character < (off + len); ++character)
+      cbuf[character] = Character.toUpperCase(cbuf[character]);
+    super.write(cbuf, off, len);
   }
 
   @Override
   public void write(int c) throws IOException {
-    throw new UnsupportedOperationException("The student has not implemented this method yet.");
+    super.write(Character.toUpperCase(c));
   }
 
 }
diff --git a/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/transformers/CompleteFileTransformer.java b/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/transformers/CompleteFileTransformer.java
index 4beca48..319f0ac 100644
--- a/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/transformers/CompleteFileTransformer.java
+++ b/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/transformers/CompleteFileTransformer.java
@@ -1,5 +1,8 @@
 package ch.heigvd.res.labio.impl.transformers;
 
+import ch.heigvd.res.labio.impl.filters.FileNumberingFilterWriter;
+import ch.heigvd.res.labio.impl.filters.UpperCaseFilterWriter;
+
 import java.io.Writer;
 
 /**
@@ -15,16 +18,13 @@ public class CompleteFileTransformer extends FileTransformer {
 
   @Override
   public Writer decorateWithFilters(Writer writer) {
-    if (true) {
-      throw new UnsupportedOperationException("The student has not implemented this method yet.");
-    }
     /*
      * If you uncomment the following line (and get rid of th 3 previous lines...), you will restore the decoration 
      * of the writer (connected to the file. You can see that you first decorate the writer with an UpperCaseFilterWriter, which you then
      * decorate with a FileNumberingFilterWriter. The resulting writer is used by the abstract class to write the characters read from the
      * input files. So, the input is first prefixed with line numbers, then transformed to uppercase, then sent to the output file.f
      */
-    //writer = new FileNumberingFilterWriter(new UpperCaseFilterWriter(writer));
+    writer = new FileNumberingFilterWriter(new UpperCaseFilterWriter(writer));
     return writer; 
   }
 
diff --git a/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/transformers/FileTransformer.java b/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/transformers/FileTransformer.java
index 18e3f14..e612549 100644
--- a/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/transformers/FileTransformer.java
+++ b/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/transformers/FileTransformer.java
@@ -58,6 +58,8 @@ public void visit(File file) {
        * writer has been decorated by the concrete subclass!). You need to write a loop to read the
        * characters and write them to the writer.
        */
+      while (reader.ready())
+        writer.write(reader.read());
       
       reader.close();
       writer.flush();
diff --git a/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/transformers/NoOpFileTransformer.java b/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/transformers/NoOpFileTransformer.java
index 5971a30..e0651e6 100644
--- a/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/transformers/NoOpFileTransformer.java
+++ b/LabJavaIO/src/main/java/ch/heigvd/res/labio/impl/transformers/NoOpFileTransformer.java
@@ -13,14 +13,13 @@ public class NoOpFileTransformer extends FileTransformer {
 
   @Override
   public Writer decorateWithFilters(Writer writer) {
-    throw new UnsupportedOperationException("The student has not implemented this method yet.");
     /*
      * The NoOpFileTransformer does not apply any transformation of the character stream
      * (no uppercase, no line number, etc.). So, we don't need to decorate the writer connected to
      * the output file at all. Just uncomment the following line and get rid of the UnsupportedOperationException and
      * you will be all set.
      */
-    //return writer;
+    return writer;
   }
 
 }
diff --git a/LabJavaIO/src/main/java/ch/heigvd/res/labio/interfaces/IFileExplorer.java b/LabJavaIO/src/main/java/ch/heigvd/res/labio/interfaces/IFileExplorer.java
index 7d387e7..1443208 100644
--- a/LabJavaIO/src/main/java/ch/heigvd/res/labio/interfaces/IFileExplorer.java
+++ b/LabJavaIO/src/main/java/ch/heigvd/res/labio/interfaces/IFileExplorer.java
@@ -1,6 +1,7 @@
 package ch.heigvd.res.labio.interfaces;
 
 import java.io.File;
+import java.io.IOException;
 
 /**
  * This interface is used to perform one operation on each element (file and
diff --git a/LabJavaIO/src/main/java/ch/heigvd/res/labio/interfaces/IFileVisitor.java b/LabJavaIO/src/main/java/ch/heigvd/res/labio/interfaces/IFileVisitor.java
index b0abe27..73010a5 100644
--- a/LabJavaIO/src/main/java/ch/heigvd/res/labio/interfaces/IFileVisitor.java
+++ b/LabJavaIO/src/main/java/ch/heigvd/res/labio/interfaces/IFileVisitor.java
@@ -1,6 +1,7 @@
 package ch.heigvd.res.labio.interfaces;
 
 import java.io.File;
+import java.io.IOException;
 
 /**
  * This interface is used together with the IFileExplorer interface. It defines