mport java.io.UnsupportedEncodingException;  import java.net.URLDecoder;  import java.net.URLEncoder;      public class UTFTest {    public static void main(String[] args) {      String str = "測試字符轉換 hello word"; //默認環境，已是UTF-8編碼      try {        String strGBK = URLEncoder.encode(str, "GBK");        System.out.println(strGBK);        String strUTF8 = URLDecoder.decode(str, "UTF-8");        System.out.println(strUTF8);      } catch (UnsupportedEncodingException e) {        e.printStackTrace();      }    }  }