Initial data commit

Task/Flatten-a-list/Java/flatten-a-list-1.java

@@ -0,0 +1,22 @@
+import java.util.LinkedList;
+import java.util.List;
+
+
+public final class FlattenUtil {
+
+	public static List<Object> flatten(List<?> list) {
+		List<Object> retVal = new LinkedList<Object>();
+		flatten(list, retVal);
+		return retVal;
+	}
+
+	public static void flatten(List<?> fromTreeList, List<Object> toFlatList) {
+		for (Object item : fromTreeList) {
+			if (item instanceof List<?>) {
+				flatten((List<?>) item, toFlatList);
+			} else {
+				toFlatList.add(item);
+			}
+		}
+	}
+}