我写的Java学生成绩管理系统源代码(17) new BufferedReader( new FileReader("data.txt")); while ((s=in.readLine())!=null) { i=numberTokenizer(s); dal.add(i); } Collections.sort(dal); DataMap dm = new DataMap(); BufferedReader in2 = new BufferedReader( new FileReader("data.txt")); while ((s=in2.readLine())!=null) { i=numberTokenizer(s); dm.put(i,s); } PrintWriter out = new PrintWriter ( new BufferedWriter(