Tried to finish this damn project, but didnt work

MyMail.java

@@ -154,7 +154,7 @@ public class MyMail {
             lastError = "Fehler beim Abfragen der Mails!";
             return -1;
         }        
-        return Integer.parseInt(mes.substring(4,6));
+        return Integer.parseInt(mes.substring(4,5));
     }
 
     /**
@@ -225,6 +225,11 @@ public class MyMail {
     public Mail getMail( int pNumber ) {
         con.send("RETR " + pNumber);
         String mes = con.receive(); // Speicher für Antworten des Servers
+        String date = "";
+        String sender = "";
+        String subject = "";
+        String text = "";
+        boolean header = false;
         if(mes == null || mes.startsWith("-ERR")){
             lastError = "Fehler beim abfragen der Mail!";
             return null;
@@ -245,9 +250,22 @@ public class MyMail {
             //
             // Hinweis: Denke daran die Maskierung des Enzeichens "." rückgängig zu machen.
             // Tipp: Merk dir in einem boolean, ob du im Textkörper oder im Header bist.
+            if( mes.trim().startsWith("Date: ") ) {
+                date = mes.substring(6);
+            }
+            else if( mes.startsWith("From: ") ) {
+                sender = mes.substring(6);
+            }
+            else if( mes.startsWith("Subject: ") ) {
+                subject = mes.substring(9);
+            }
+            else if( mes.startsWith("") || header) {
+                text += mes + "/n";
+            }
+            mes = con.receive();
         } // end of while
-
-        return null;
+        
+        return new Mail(pNumber, date, sender, subject, text);
     }
 
     /**

package.bluej

@@ -19,17 +19,17 @@ dependency6.to=Mail
 dependency6.type=UsesDependency
 editor.fx.0.height=1017
 editor.fx.0.width=914
-editor.fx.0.x=771
-editor.fx.0.y=0
-objectbench.height=93
+editor.fx.0.x=363
+editor.fx.0.y=14
+objectbench.height=134
 objectbench.width=1656
 package.divider.horizontal=0.6
-package.divider.vertical=0.8920086393088553
-package.editor.height=819
+package.divider.vertical=0.8297101449275363
+package.editor.height=680
 package.editor.width=1545
 package.editor.x=0
-package.editor.y=0
-package.frame.height=1026
+package.editor.y=98
+package.frame.height=928
 package.frame.width=1696
 package.numDependencies=6
 package.numTargets=5