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    <p>This is a unicode character whose index is <code>U+1F600 (128512)</code> - GRINNING FACE</p> <p>Refer the <a href="http://www.charbase.com/1f600-unicode-grinning-face" rel="nofollow noreferrer">URL</a> for details </p> <p>The String you have mentioned is HTML Escape of U+1F600, If you unescape it using Apache commons lang it will draw you the required smiley as provided in screenshot </p> <p>The set of characters from U+0000 to U+FFFF is sometimes referred to as the Basic Multilingual Plane (BMP). Characters whose code points are greater than U+FFFF are called supplementary characters. The Java platform uses the UTF-16 representation in char arrays and in the String and StringBuffer classes. In this representation, supplementary characters are represented as a pair of char values, the first from the high-surrogates range, (\uD800-\uDBFF), the second from the low-surrogates range (\uDC00-\uDFFF). </p> <p>Regarding your update that its not converting back to &#128512;</p> <p>You can also represent a character using a Numeric Character Reference, of the form &amp;#dddd;, where dddd is the decimal value representing the character's Unicode scalar value. You can alternatively use a hexadecimal representation &amp;#xhhhh;, where hhhh is the hexadecimal value equivalent to the decimal value. A good site for <a href="http://www.russellcottrell.com/greek/utilities/SurrogatePairCalculator.htm" rel="nofollow noreferrer">this</a> </p> <p>Have added few SoP to help you understand this unicode better.</p> <p><img src="https://i.stack.imgur.com/6hE0S.png" alt="enter image description here"></p>
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    1. USManish Singh
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    1. COYes, it will return a smiley since I got the "&#128512;" from an emoji list. My only problem now is when I tried to escaped now that smiley, it won't give me back the "&#128512;" (I've tried this with StringEscapeUtils.unescapeHtml4(). I'll try this with the translate())
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    2. COStringEscapeUtils.ESCAPE_HTML4.translate(smiley) won't give me back the "&#128512;"
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    3. COHave updated the answer after your modified question :) , refer the link to know the logic of calculating HTML entity from unicode for surrogates.
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