单项选择题 What will be the result of attempting to compile and run the following program？（）   public class Q28fd {   public static void main（String args[]） {   int counter = 0；   l1：   for （int i=10； i<0； i--） {   l2：  int j = 0；   while （j < 10） {   if （j > i） break l2；   if （i == j） {   counter++；   continue l1；   }   }   counter--；   }   System.out.println（counter）；  }   }

多项选择题 Whicharevalididentifiers？（）

单项选择题 Which method implementations will write the given string to a file named "file"， using UTF8 encoding？（）   IMPLEMENTATION a：   public void write（String msg） throws IOException {   FileWriter fw = new FileWriter（new File（"file"））；   fw.write（msg）；   fw.close（）；   }   IMPLEMENTATION b：   public void write（String msg） throws IOException {   OutputStreamWriter osw =  new OutputStreamWriter（new FileOutputStream（"file"）， "UTF8"）；  osw.write（msg）；   osw.close（）；   }   IMPLEMENTATION c：   public void write（String msg） throws IOException {  FileWriter fw = new FileWriter（new File（"file"））；   fw.setEncoding（"UTF8"）；   fw.write（msg）；   fw.close（）；  }   IMPLEMENTATION d：   public void write（String msg） throws IOException {  FilterWriter fw = FilterWriter（new FileWriter（"file"）， "UTF8"）；   fw.write（msg）；  fw.close（）；   }   IMPLEMENTATION e：   public void write（String msg） throws IOException {   OutputStreamWriter osw = new OutputStreamWriter（  new OutputStream（new File（"file"））， "UTF8"  ）；   osw.write（msg）；   osw.close（）；   }