分组统计个数

原创于 2022-08-26 09:10:37 发布 · 644 阅读

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#文本 #分组

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本文介绍了一种使用Java处理文本文件的方法，并通过SPL简化了数据处理流程。具体需求为比较文本文件中字符串的大小写并进行汇总，最终将结果输出到新的文本文件中。SPL提供了一行代码解决方案，极大提高了处理效率。

【问题】

I have a text file with content like, with 792 lines:

der 17788648
und 14355959
die 10939606
Die 10480597

Now I want to compare if "Die" and "die" are equal in lowercase. So if two Strings in lowerCase are equal, copy the word into a new text file in lowerCase and sum the values.

Expected output:

der 17788648
und 14355959
die 21420203

I have that so far:

  try {
        BufferedReader bk = null;
        BufferedWriter bw = null;

        bk = new BufferedReader(new FileReader("outagain.txt"));
        bw = new BufferedWriter(new FileWriter("outagain5.txt"));

        List<String> list = new ArrayList<>();
        String s = "";
        while (s != null) {
            s = bk.readLine();
            list.add(s);
        }


        for (int k = 0; k < 793; k++) {
            String u = bk.readLine();
            if (list.contains(u.toLowerCase())) {

                //sum values?

            } else {
                bw.write(u + "\n");
            }
        }

        System.out.println(list.size());

    } catch (Exception e) {
        System.out.println("Exception caught : " + e);
    }