[Charset]실행시 디폴트값 설정

디폴트 캐릭터셋 변경~

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-Dfile.encoding=UTF-8
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  byte []b = new byte[]{-21, -117, -76, -21, -78, -68, -21, -99, -67};
  String c = new String(b); // new String(b, "UTF-8")  
  System.out.println("Result:" + c);
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*궁금하면 찍어보자.
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  Charset cset = Charset.defaultCharset();
  String csetName = cset.name();
  System.out.println("default charset:" + csetName);
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