如何从 txt 文件中分离和比较字符串

Question

我需要你的帮助！

我在一个 txt 文件中混合了任何信息：

我必须按照下面的规则来打分

• 答对2分；
• -1 分错误答案；
• 未回答问题的分数（带空格）

并根据以下等级对总分进行分类

• 40~36 =>> A
• 35~31 =>> B
• 30~26 =>> C

我的代码是：

    private void readRaw() {
        tv.append("\n\nDiretório do arquivo processado: res/raw/history_data.txt:\n");
        InputStream is = this.getResources()
                .openRawResource(R.raw.history_data);
        InputStreamReader isr = new InputStreamReader(is);
        BufferedReader br = new BufferedReader(isr, 8192);


        try {
            String test;


            while (true) {
                test = br.readLine();


    // How do I compare the contents of the first line with the contents of the last 20                                     characters of each line?

                if (test == null)
                    break;
                else
                tv.append("\n" + "    " + test);

            }

            isr.close();
            is.close();
            br.close();
        } catch (IOException e) {
            e.printStackTrace();
        }              
    }
}

Answer 1

你可以这样做

private void readRaw() {
        tv.append("\n\nDiretório do arquivo processado: res/raw/history_data.txt:\n");
        InputStream is = this.getResources()
                .openRawResource(R.raw.history_data);
        InputStreamReader isr = new InputStreamReader(is);
        BufferedReader br = new BufferedReader(isr, 8192);

        try {
            String test, correctAnswer = null;
            int lineNo = 0;

            ArrayList<String> studentNames = new ArrayList<String>();
            ArrayList<String> answers = new ArrayList<String>(); 

            while (true) {
                test = br.readLine();
                if (test == null)
                    break;
                else
                    tv.append("\n" + "    " + test);

                if(lineNo == 0)
                {
                    correctAnswer = test;
                }
                else
                {
                    String[] contents = test.split(" ", 2);
                    studentNames.add(contents[0]);
                    answers.add(contents[1]);
                }
                lineNo++;
            }

            for (String string : answers) {
                int result = compare(string, correctAnswer);
                // get grade according to points and print the information
            }

            isr.close();
            is.close();
            br.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

使用compare()函数将学生的答案与实际答案进行比较

    private int compare(String string, String correctAnswer) {

        int totalPoints = 0;
        if(string.length() != correctAnswer.length())
        {
            return totalPoints;
        }

        for (int i = 0; i < string.length(); i++) {
            if(string.charAt(i) == correctAnswer.charAt(i) && string.charAt(i) != ' ')
            {
                totalPoints += 2;
            }
            else if(string.charAt(i) != ' ')
            {
                totalPoints -= 1;
            }
        }
        return totalPoints;
    }