java - 用java解析文本文件

Question

我有一个 txt 文件，其中包含约 900 个问题，如下所示:

关于问题:

-----------------------------------------------------------------------------
  #0001 Which disease devastated livestock across the UK during 2001?
-----------------------------------------------------------------------------
 *Hand-and-foot
 *Foot-in-mouth
 *Hand-to-mouth
 *Foot-and-mouth

Answer: Foot-and-mouth

-----------------------------------------------------------------------------
  #0002 Which of these kills its victims by constriction?
-----------------------------------------------------------------------------
 *Andalucia
 *Anaconda
 *Andypandy
 *Annerobinson

Answer: Anaconda

我有一个存储问题的对象和存储答案的对象

IE:Question.java

public class Question {
    private String questionText;
    private Answer a, b, c, d;

    public Question(String questionText, Answer a, Answer b, Answer c, Answer d) {
        this.questionText = questionText;
        this.a = a;
        this.b = b;
        this.c = c;
        this.d = d;
    }

    public String getQuestionText() {
        return questionText;
    }

    public void setQuestionText(String questionText) {
        this.questionText = questionText;
    }

    public Answer getA() {
        return a;
    }

    public void setA(Answer a) {
        this.a = a;
    }

    public Answer getB() {
        return b;
    }

    public void setB(Answer b) {
        this.b = b;
    }

    public Answer getC() {
        return c;
    }

    public void setC(Answer c) {
        this.c = c;
    }

    public Answer getD() {
        return d;
    }

    public void setD(Answer d) {
        this.d = d;
    }

    public String toString() {
        return  questionText +
                "\nA) " + a +
                "\nB) " + b +
                "\nC) " + c +
                "\nD) " + d;
    }
}

答案.Java

public class Answer {
    private String answerText;
    private boolean correct;

    //constructor to set correct answer
    public Answer(String answerText, boolean correct) {
        this.answerText = answerText;
        this.correct = correct;
    }

    public Answer(String answerText) {
        this.answerText = answerText;
        this.correct = false;
    }

    public String getAnswerText() {
        return answerText;
    }

    public void setAnswerText(String answerText) {
        this.answerText = answerText;
    }

    public boolean isCorrect() {
        return correct;
    }

    public void setCorrect(boolean correct) {
        this.correct = correct;
    }

    public String toString() {
        return answerText;
    }
}

我想创建一个数组列表来存储从文本文件解析的所有问题对象。我是 Java 新手，之前主要使用 python 进行编程，并且对如何在 java 中进行文本文件解析感到有点困惑，因为它看起来要复杂得多。例如，我知道如何逐行或单词列表进行解析。我不知道如何处理文件中的额外文本。

如有任何帮助，我们将不胜感激。

两行问题示例:

-----------------------------------------------------------------------------
  #0016 Which word follows 'North' and 'South' to give the names of two
        continents?
-----------------------------------------------------------------------------
 *Africa
 *America
 *Asia
 *Australia

Answer: America

Answer 1

嗨，这里有一些东西可以解决这个问题；)

    String file = "text.txt";
    BufferedReader br = null;
    int nbAnswer = 4;
    try {
        br = new BufferedReader(new FileReader(file));
        String line;
        while((line = br.readLine()) != null) {   
            if( line.contains("-----------"))
            {
                line = br.readLine();
                String question = line.split("#[0-9]{4} ")[1];
                while(!(line = br.readLine()).contains("-----------"))
                    question += " " + line.trim();

                String[] answers = new String[4];

                for( int i = 0; i < nbAnswer; i++)
                    answers[i] = br.readLine().substring(2);

                br.readLine();
                String sol = br.readLine().split("Answer: ")[1];
                System.out.println(question + "\nanswer: " + answers[0] + " " + answers[1] + " " + answers[2] + " " + answers[3] + "\nsol " + sol);
            }
        }
    }
    catch(IOException ex) {
        System.err.println(ex);
    }

line.split("#[0-9]{4} ")[1]; 是一个正则表达式，允许您在 # 后跟 4 个数字和一个空间。

至少这是一个好的开始;)

PS:制作包含问题等的漂亮 .txt 有很多错误。

1. 解析起来比较困难
2. 尺寸更大

例如，您可以将 *Foot-and-mouth 更改为 (*)Foot-and-mouth 以表明这就是答案，而不是再添加 2 行为了它;)