Improve StringListWriter constructor.

src/fr/devinsy/util/StringListWriter.java

@@ -31,6 +31,21 @@ public class StringListWriter extends Writer
 		this.out = new StringList(size);
 	}
 
+	/**
+	 * 
+	 */
+	StringListWriter(final StringList target)
+	{
+		if (target == null)
+		{
+			throw new NullPointerException("target is null.");
+		}
+		else
+		{
+			this.out = target;
+		}
+	}
+
 	/*
 	 *
 	 */