java - Emoji not encoding -

i retrieving twitter tweets , attempting save them flat file. have following code:

string jsonstring = new gson().tojson(tweets);   byte[] utf8jsonstring = jsonstring.getbytes("utf-8");   string utf8json = new string(utf8jsonstring, "utf-8");  system.out.println( utf8json); 

output:

..."id":768260789744443392,"text":"#emojicity5 ?","source"... 

the emoji (just after #emojicity5) appearing ?. have attempted endode using utf-8, utf-16be, utf-16le, utf-32be, , utf-32le no avail. system using jdk 1.6 , 3.0.3 of twitter4j. missing here?

string contains unicode, no need convert same string. when or byte[] 1 needs indicate encoding of bytes.

however problem console has no unicode encoding utf-8 , might not have emoji in fonts. problem of system.out.println. in case system.out in other encoding not represent emoji , instead printed question mark.

what can check whether emoji arrived, dump unicode code points.

in java 8:

jasonstring.tocodepoints()         .filter(cp -> cp >= 256)         .foreach(cp -> {             system.out.printf("u+%x = %s%n",                 cp, character.getname(cp));          });  boolean containsemoji(string s) {     return s.codepoints().anymatch(cp ->         unicodeblock.of(cp).equals(unicodeblock.emoticons)); }