我有一个txt文件，其中有大约900个问题，如下所示：
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，以及存储答案的对象
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;
}
}
Answers.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，用于存储从文本文件中解析的所有问题对象。我刚接触Java并且之前主要在python中编程，并且对于如何在java中进行文本文件解析感到有些困惑，因为它看起来要复杂得多。我知道如何逐行解析或例如单词列表。我不知道如何使用文件中的额外文本。
任何帮助都将不胜感激。
两行问题的样本：
-----------------------------------------------------------------------------
#0016 Which word follows 'North' and 'South' to give the names of two
continents?
-----------------------------------------------------------------------------
*Africa
*America
*Asia
*Australia
Answer: America
答案 0 :(得分：1)
实现一个简单的FSM并逐行解析。阅读，直到找到以#dddd开头的行，然后阅读，直至找到以-开头的行。这些界限构成了一个问题。阅读，直到找到以*开头的行，然后阅读，直至找到空白行。这些是你的选择。接下来阅读，直到找到以Answer开头的行，这是你的答案。重复。
答案 1 :(得分：1)
嗨，这里有一些东西可以解决问题;）
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个数字和空格后拆分字符串。
至少它是一个好的开始;）
PS：关于做一个包含问题等的漂亮的.txt，有很多错误的事情。例如，您可以将*Foot-and-mouth更改为(*)Foot-and-mouth，以表明这是答案，而不是为其添加2行;）
答案 2 :(得分：0)
如果你的每个问题在一个文件中只有10行，那么就可以逐行解析它，从每个记录的位置得到每个记录的平均值，而不是内容：
public class Parse {
public static final int OPTION_PREFIX_LENGTH = "*".length();
public static final int ANSWER_PREFIX_LENGTH = "Answer: ".length();
public static final String QUESTION_SEPARATOR = "-----------------------------------------------------------------------------";
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new FileReader("/Users/Marboni/tmp/test.txt"));
try {
while (br.ready()) {
br.readLine(); // Skip separator (----).
StringBuilder questionBuilder = new StringBuilder();
String questionLine;
while (!QUESTION_SEPARATOR.equals(questionLine = br.readLine())) { // Reading lines and add them to question until separator.
questionBuilder.append(questionLine.trim()).append(' ');
}
String questionText = questionBuilder.toString().trim();
String a = parseQuestion(br.readLine()); // Option a).
String b = parseQuestion(br.readLine()); // Option b).
String c = parseQuestion(br.readLine()); // Option c).
String d = parseQuestion(br.readLine()); // Option d).
br.readLine(); // Skip blank line.
String answer = parseAnswer(br.readLine()); // Answer.
if (br.ready()) {
br.readLine(); // Skip blank line between questions, if exists.
}
Question question = new Question(questionText,
new Question.Answer(a, answer.equals(a)),
new Question.Answer(b, answer.equals(b)),
new Question.Answer(c, answer.equals(c)),
new Question.Answer(d, answer.equals(d))
);
// Do something with it.
}
} finally {
br.close();
}
}
private static String parseQuestion(String record) {
return record.trim().substring(OPTION_PREFIX_LENGTH);
}
private static String parseAnswer(String record) {
return record.trim().substring(ANSWER_PREFIX_LENGTH);
}
}