Use new API

src/test/java/j8583/TestHexCodec.java

@@ -12,7 +12,7 @@ public class TestHexCodec {
 	public void encodeDecode(String hex) {
 		byte[] buf = HexCodec.hexDecode(hex);
 		Assert.assertEquals((hex.length() / 2) + (hex.length() % 2), buf.length);
-		String reenc = HexCodec.hexEncode(buf);
+		String reenc = HexCodec.hexEncode(buf, 0, buf.length);
 		if (reenc.startsWith("0") && !hex.startsWith("0")) {
 			Assert.assertEquals(reenc.substring(1), hex);
 		} else {
@@ -41,4 +41,10 @@ public class TestHexCodec {
 		encodeDecode("ABC");
 	}
 
+    @Test
+    public void testPartial() {
+        Assert.assertEquals("FF01", HexCodec.hexEncode(new byte[]{0, (byte)0xff, 1, 2, 3, 4},
+                1, 2));
+    }
+
 }