diff --git a/src/org/hwo/ArrayHelper.java b/src/org/hwo/ArrayHelper.java
new file mode 100644
index 0000000..f00330d
--- /dev/null
+++ b/src/org/hwo/ArrayHelper.java
@@ -0,0 +1,38 @@
+package org.hwo;
+
+public class ArrayHelper {
+
+	
+	public static Integer[] box(int[] a){
+		Integer[] r = new Integer[ a.length];
+		for (int i=0;i<a.length;i++){
+			r[i] = a[i];
+		}
+		return r;
+	}
+	public static int[] unbox(Integer[] a){
+		int[] r = new int[ a.length];
+		for (int i=0;i<a.length;i++){
+			r[i] = a[i];
+		}
+		return r;
+	}
+	
+	public static byte[] unbox(Byte[] bytes){
+		byte[] t = new byte[ bytes.length ];
+		
+		for (int i=0;i<t.length;i++)
+			t[i] = bytes[i];
+		
+		return t;
+	}
+
+	public static Byte[] box(byte[] bytes){
+		Byte[] t = new Byte[ bytes.length ];
+		
+		for (int i=0;i<t.length;i++)
+			t[i] = bytes[i];
+		
+		return t;
+	}
+}
diff --git a/src/org/hwo/ByteArrayHelper.java b/src/org/hwo/ByteArrayHelper.java
index 97293f3..122465c 100644
--- a/src/org/hwo/ByteArrayHelper.java
+++ b/src/org/hwo/ByteArrayHelper.java
@@ -1,28 +1,6 @@
 package org.hwo;
 
-public class ByteArrayHelper {
+public class ByteArrayHelper extends ArrayHelper{
 
-	public ByteArrayHelper() {
-	}
-	
-	
-	public static byte[] unbox(Byte[] bytes){
-		byte[] t = new byte[ bytes.length ];
-		
-		for (int i=0;i<t.length;i++)
-			t[i] = bytes[i];
-		
-		return t;
-	}
-
-	public static Byte[] box(byte[] bytes){
-		Byte[] t = new Byte[ bytes.length ];
-		
-		for (int i=0;i<t.length;i++)
-			t[i] = bytes[i];
-		
-		return t;
-	}
-	
 
 }