diff --git a/src/fr/devinsy/util/strings/StringListUtils.java b/src/fr/devinsy/util/strings/StringListUtils.java
index 2c97490..a53461e 100644
--- a/src/fr/devinsy/util/strings/StringListUtils.java
+++ b/src/fr/devinsy/util/strings/StringListUtils.java
@@ -495,6 +495,72 @@ public class StringListUtils
         return result;
     }
 
+    /**
+     * 
+     * @param source
+     * @return
+     */
+    public static String toStringSeparatedBy(final Collection<String> source, final String separator)
+    {
+        String result;
+
+        if (source == null)
+        {
+            result = null;
+        }
+        else
+        {
+            result = new StringList(source).toStringSeparatedBy(separator);
+        }
+
+        //
+        return result;
+    }
+
+    /**
+     * 
+     * @param strings
+     * @return
+     */
+    public static String toStringSeparatedBy(final String[] source, final String separator)
+    {
+        String result;
+
+        if (source == null)
+        {
+            result = null;
+        }
+        else
+        {
+            result = new StringList(source).toStringSeparatedBy(separator);
+        }
+
+        //
+        return result;
+    }
+
+    /**
+     * 
+     * @param strings
+     * @return
+     */
+    public static String toStringSeparatedBy(final StringList source, final String separator)
+    {
+        String result;
+
+        if (source == null)
+        {
+            result = null;
+        }
+        else
+        {
+            result = source.toStringSeparatedBy(separator);
+        }
+
+        //
+        return result;
+    }
+
     /**
      * 
      * @param strings