### Question:
Decode { public static String str2HexStr(String str) { char[] chars = "0123456789ABCDEF".toCharArray(); StringBuilder sb = new StringBuilder(); byte[] bs = str.getBytes(); int bit; for (int i = 0; i < bs.length; i++) { bit = (bs[i] & 0x0f0) >> 4; sb.append(chars[bit]); bit = bs[i] & 0x0f; sb.append(chars[bit]); } return sb.toString().trim(); }  static String str2HexStr(String str); static String hexStr2Str(String hexStr);  }### Answer:
@Test public void str2HexStr() { String[] arr = new String[]{"hello word", "1234", "系统找不到指定的路径", "系统找不到指定的路径hello word,.。.。，、;：？!ˉˇ¨`~ 々～"}; for (String str : arr) { String str_en1 = Decode.str2HexStr(str); System.out.println(str + "<加密>" + str_en1 + "<解密前后是否一致>" + str.equals(Decode.hexStr2Str(str_en1))); } }