将文件从一个文件分割成不同的子字符串

Question

I need help in order to split some individual lines into different substrings with the help of IndexOf.

The substrings are separated with *, for example:

Question*Answer*AnswerA*AnswerB*CorrectAwnser

How can I split the string in order to get Answer, AnswerA, AnswerB, and CorrectAnswer?

Here is part of my code. What could I do after getQuestion() with getAnserA, getAnserB and getCorrectAnswer

try {
  InputStream is = context.getAssets().open(questionFile);
  BufferedReader reader = new BufferedReader(new InputStreamReader(is));
  // Skips lines
  for (int i = 0; i< questionCount; i++) {
    reader.readLine();
  }
  question = reader.readLine();
} catch (IOException e) {
  e.printStackTrace();
}

public String getQuestion() {
  return question.substring(0, question.indexOf("*"));
}

Answer 1

Use a StringTokenizer to split a string to n number of strings. you need to pass the delimiters.

for example

  String questiongString = "Question1*Question2*Question3";
     StringTokenizer splitter = new StringTokenizer(questionString, "*");
     while (splitter.hasMoreTokens()) {
              String question = splitter.nextToken();
       }

Answer 2

You don't need indexOf, String has a useful split method:

String[] parts = question.split("\\*");

String q = parts[0];
String answer = parts[1];
String answerA = parts[2];
String answerB = parts[3];
String correctAnswer = parts[4];

Answer 3

int indexOfFirstStar = question.indexOf('*');
int indexOfSecondStar = question.indexOf('*', indexOfFirstStar + 1);
int indexOfThirdStar = question.indexOf('*', indexOfSecondStar + 1);
...

Once you have all the indices, you just need to use substring. Read the String javadoc .