从文本文件中读取出所有的姓名，并打印出重复的姓名和重复的次数

        public static void main(String[] args) throws IOException {
                
                File f = new File("D:" + File.separator + "a.txt");
                BufferedReader bf = new BufferedReader(new FileReader(f));
                ArrayList<String> list = new ArrayList<String>();
                Map<String, Integer> map = new HashMap<String, Integer>();

                String temp = null;
                while ((temp = bf.readLine()) != null) {
                        list.add(temp);
                }

                for (int i = 0; i < list.size(); i++) {
                        String str = list.get(i).split(",")[1];
                        boolean flag = false;
                        // 如果出现过，value值加1
                        for (Map.Entry<String, Integer> entry : map.entrySet()) {
                                if (entry.getKey().equals(str)) {
                                        entry.setValue(entry.getValue() + 1);
                                        flag = true;
                                        break;
                                }
                        }
                        // 如果没有出现过，加入map
                        if (!flag) {
                                map.put(str, 1);
                        }
                }

                for (Map.Entry<String, Integer> entry : map.entrySet()) {
                        if (entry.getValue() > 1) {
                                System.out.println("\"" + entry.getKey() + "\"" + "重复次数：" + entry.getValue());
                        }
                }
        }