java文件操作代码片断实例实现统计文件中字母出现的个数功能

string filename = "d:/date.java.bak";
        // string filename = "d:/test.qqq";
        string line;
        int i = 0, j = 0, f = 0, k = 0;
        try {
            bufferedreader in = new bufferedreader(new filereader(filename));
            line = in.readline();
            while (line != null) {
                // system.out.println(line);
                char c[] = line.tochararray();
                for (int i1 = 0; i1 < c.length; i1++) {
                    // 如果是字母
                    if (character.isletter(c[i1]))
                        i++;
                    // 如果是数字
                    else if (character.isdigit(c[i1]))
                        j++;
                    // 是空格
                    else if (character.iswhitespace(c[i1]))
                        f++;
                }
                line = in.readline();
                k++;
            }
            in.close();
            system.out
                    .println("字母:" + i + ",数字:" + j + ",空格:" + f + ",行数:" + k);
        } catch (ioexception e) {
            e.printstacktrace();
        }