diff --git a/src/fr/devinsy/util/StringList.java b/src/fr/devinsy/util/StringList.java
index 31ab8c0..6d01c4a 100755
--- a/src/fr/devinsy/util/StringList.java
+++ b/src/fr/devinsy/util/StringList.java
@@ -22,6 +22,7 @@ import java.io.IOException;
 import java.text.Collator;
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.List;
 
 /**
  * This class is a collection of String objects with specific methods. It makes
@@ -51,6 +52,26 @@ public class StringList extends ArrayList<String> implements CharSequence
 		super(initialCapacity);
 	}
 
+	/**
+	 *
+	 */
+	public StringList(final List<String> source)
+	{
+		super();
+
+		if (source != null)
+		{
+			//
+			ensureCapacity(source.size());
+
+			//
+			for (String string : source)
+			{
+				this.add(string);
+			}
+		}
+	}
+
 	/**
 	 *
 	 */
@@ -150,6 +171,27 @@ public class StringList extends ArrayList<String> implements CharSequence
 		return (result);
 	}
 
+	/**
+	 * 
+	 */
+	public StringList append(final List<String> strings)
+	{
+		StringList result;
+
+		if (strings != null)
+		{
+			for (String string : strings)
+			{
+				this.add(string);
+			}
+		}
+
+		result = this;
+
+		//
+		return (result);
+	}
+
 	/**
 	 * 
 	 */
@@ -277,6 +319,19 @@ public class StringList extends ArrayList<String> implements CharSequence
 		return (result);
 	}
 
+	/**
+	 * 
+	 */
+	public StringList appendln(final List<String> string)
+	{
+		StringList result;
+
+		result = this.append(string).appendln();
+
+		//
+		return (result);
+	}
+
 	/**
 	 * 
 	 */
diff --git a/src/fr/devinsy/util/StringSet.java b/src/fr/devinsy/util/StringSet.java
new file mode 100644
index 0000000..70331a8
--- /dev/null
+++ b/src/fr/devinsy/util/StringSet.java
@@ -0,0 +1,447 @@
+/**
+ * Copyright (C) 2014 Christian Pierre MOMON
+ * 
+ * This file is part of Devinsy-utils.
+ * 
+ * Devinsy-utils is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * Devinsy-utils is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with Devinsy-utils.  If not, see <http://www.gnu.org/licenses/>
+ */
+package fr.devinsy.util;
+
+import java.util.HashSet;
+import java.util.List;
+
+/**
+ * This class is a set of String objects with specific methods. It makes
+ * possible to build a string without any copy. The goal is to make easier the
+ * use of set of strings.
+ */
+public class StringSet extends HashSet<String>
+{
+	private static final long serialVersionUID = 7421460140821150313L;
+
+	/**
+	 *
+	 */
+	public StringSet()
+	{
+		super();
+	}
+
+	/**
+	 *
+	 */
+	public StringSet(final int initialCapacity)
+	{
+		super(initialCapacity);
+	}
+
+	/**
+	 *
+	 */
+	public StringSet(final List<String> source)
+	{
+		super();
+
+		if (source != null)
+		{
+			//
+			for (String string : source)
+			{
+				this.add(string);
+			}
+		}
+	}
+
+	/**
+	 *
+	 */
+	public StringSet(final String[] source)
+	{
+		super();
+
+		if (source != null)
+		{
+			//
+			for (String string : source)
+			{
+				this.add(string);
+			}
+		}
+	}
+
+	/**
+	 *
+	 */
+	public StringSet(final StringList source)
+	{
+		super();
+
+		if (source != null)
+		{
+			//
+			for (String string : source)
+			{
+				this.add(string);
+			}
+		}
+	}
+
+	/**
+	 *
+	 */
+	public StringSet(final StringSet source)
+	{
+		super();
+
+		if (source != null)
+		{
+			//
+			for (String string : source)
+			{
+				this.add(string);
+			}
+		}
+	}
+
+	/**
+	 * Check null parameter before add.
+	 */
+	@Override
+	public boolean add(final String string)
+	{
+		boolean result;
+
+		if (string != null)
+		{
+			//
+			result = super.add(string);
+		}
+		else
+		{
+			//
+			result = false;
+		}
+
+		//
+		return result;
+	}
+
+	/**
+	 * 
+	 */
+	public StringSet append(final StringSet strings)
+	{
+		StringSet result;
+
+		if (strings != null)
+		{
+			for (String string : strings)
+			{
+				this.add(string);
+			}
+		}
+
+		result = this;
+
+		//
+		return result;
+	}
+
+	/**
+	 * Deep copy and shallow copy have no sense about a list of immutable
+	 * objects.
+	 * 
+	 * @return
+	 */
+	@Override
+	public StringSet clone()
+	{
+		StringSet result;
+
+		result = new StringSet(size());
+
+		for (String string : this)
+		{
+			result.add(string);
+		}
+
+		//
+		return result;
+	}
+
+	/**
+	 * 
+	 */
+	public int length()
+	{
+		int result = 0;
+
+		for (String string : this)
+		{
+			result += string.length();
+		}
+
+		//
+		return result;
+	}
+
+	/**
+	 * 
+	 */
+	public StringSet merge()
+	{
+		StringSet result;
+
+		String merge = this.toString();
+
+		clear();
+		add(merge);
+
+		//
+		result = this;
+		return result;
+	}
+
+	/**
+	 * Check null parameter before add.
+	 */
+	public StringSet pub(final String string)
+	{
+		StringSet result;
+
+		if (string != null)
+		{
+			this.add(string);
+		}
+
+		result = this;
+
+		//
+		return result;
+	}
+
+	/**
+	 * 
+	 */
+	public StringSet put(final char character)
+	{
+		StringSet result;
+
+		this.add(String.valueOf(character));
+
+		result = this;
+
+		//
+		return result;
+	}
+
+	/**
+	 * 
+	 */
+	public StringSet put(final double value)
+	{
+		StringSet result;
+
+		result = this.put(String.valueOf(value));
+
+		//
+		return result;
+	}
+
+	/**
+	 * 
+	 */
+	public StringSet put(final Double value)
+	{
+		StringSet result;
+
+		if (value != null)
+		{
+			this.put(String.valueOf(value));
+		}
+
+		result = this;
+
+		//
+		return result;
+	}
+
+	/**
+	 * 
+	 */
+	public StringSet put(final int value)
+	{
+		StringSet result;
+
+		result = this.put(String.valueOf(value));
+
+		//
+		return result;
+	}
+
+	/**
+	 * 
+	 */
+	public StringSet put(final List<String> strings)
+	{
+		StringSet result;
+
+		if (strings != null)
+		{
+			for (String string : strings)
+			{
+				this.put(string);
+			}
+		}
+
+		result = this;
+
+		//
+		return result;
+	}
+
+	/**
+	 * 
+	 */
+	public StringSet put(final long value)
+	{
+		StringSet result;
+
+		result = this.put(String.valueOf(value));
+
+		//
+		return result;
+	}
+
+	/**
+	 * 
+	 */
+	public StringSet put(final String string)
+	{
+		StringSet result;
+
+		if (string != null)
+		{
+			this.add(string);
+		}
+
+		result = this;
+
+		//
+		return result;
+	}
+
+	/**
+	 * 
+	 */
+	public StringSet put(final String... strings)
+	{
+		StringSet result;
+
+		if (strings != null)
+		{
+			for (String string : strings)
+			{
+				this.put(string);
+			}
+		}
+
+		result = this;
+
+		//
+		return result;
+	}
+
+	/**
+	 * 
+	 */
+	public StringSet put(final StringList strings)
+	{
+		StringSet result;
+
+		if (strings != null)
+		{
+			for (String string : strings)
+			{
+				this.put(string);
+			}
+		}
+
+		result = this;
+
+		//
+		return result;
+	}
+
+	/**
+	 * 
+	 */
+	public StringSet put(final StringSet strings)
+	{
+		StringSet result;
+
+		if (strings != null)
+		{
+			for (String string : strings)
+			{
+				this.put(string);
+			}
+		}
+
+		result = this;
+
+		//
+		return result;
+	}
+
+	/**
+	 * 
+	 */
+	@Override
+	public String toString()
+	{
+		String result;
+
+		StringBuffer buffer = new StringBuffer(length());
+
+		for (String string : this)
+		{
+			buffer.append(string);
+		}
+
+		result = buffer.toString();
+
+		//
+		return result;
+	}
+
+	/**
+	 * 
+	 * @return
+	 */
+	public StringList toStringList()
+	{
+		StringList result;
+
+		result = new StringList(this.size());
+
+		for (String string : this)
+		{
+			result.append(string);
+		}
+
+		//
+		return result;
+	}
+}