### Question:
StringUtil { public static String byte2HexStr(byte[] b) { String hs = ""; String stmp = ""; for (int n = 0; n < b.length; n++) { stmp = Integer.toHexString(b[n] & 0xFF); if (stmp.length() == 1) { hs = hs + "0" + stmp; } else { hs = hs + stmp; } } return hs.toUpperCase(); }  static String getMiddleString(String text, String lStr, String rStr); static String deleteCRLFOnce(String input); static String str2HexStr(String str); static String hexStr2Str(String hexStr); static String byte2HexStr(byte[] b); static byte[] hexStr2Bytes(String src); static String str2Unicode(String strText); static String unicode2Str(String hex); static String delTagsFContent(String content); static String formatSize(double size); static String getEncoding(byte[] bytes); static List<Node> getFileList(Torrent torrent); static CodepageDetectorProxy detector; }### Answer:
@Test public void testByte2HexStr() { assertEquals("060200", StringUtil.byte2HexStr(new byte[]{ (byte)6, (byte)2, (byte)0 })); }