Question

以下是我从文本文件中读取的代码：

    public RecordManager(){
    int pos;
    String athlete, record, country, raceTime;
    try {
        Scanner scFile = new Scanner(new File("resultdata.txt"));
        while(scFile.hasNext()){
            Scanner sc = new Scanner(scFile.next()).useDelimiter("#");
            athlete = sc.next();
            country = sc.next();
            pos = sc.nextInt();
            record = sc.next();
            raceTime = sc.next();                
            sc.close();
            if("WRC".equals(record)){
                resultArr[size] = new WorldRecord(athlete, country, pos, raceTime);
            }
            else if("OLR".equals(record)){
                resultArr[size] = new OlympicRecord(athlete, country, pos, raceTime);
            }
            else{
                resultArr[size] = new RaceResult(athlete, country, pos, raceTime);
            }
            size++;
        }
    } catch (FileNotFoundException ex) {
        Logger.getLogger(RecordManager.class.getName()).log(Level.SEVERE, null, ex);
    }

以下是文本文件中的内容：

Carey Blem#ITA#6#---#4m49.8 
Tammera Hoesly#POR#1#---#4m6.2 
Toi Swauger#FRA#1#OLR#51.3 
Moises Mellenthin#ZIM#2#---#4m34 
Madelene Mcclennon#LUX#1#WRC#1m52.7 
Lashon Meisenheimer#RSA#1#---#2m31.2

我一直在尝试和尝试，但我只是继续这样做：

run:
Exception in thread "main" java.util.NoSuchElementException
at java.util.Scanner.throwFor(Scanner.java:907)
at java.util.Scanner.next(Scanner.java:1416)
at it.practical.training.RecordManager.<init>(RecordManager.java:29)
at it.practical.training.SimpleInterface.main(SimpleInterface.java:20)
Java Result: 1
BUILD SUCCESSFUL (total time: 13 seconds)

请告诉我出了什么问题。

Answer 1

当您使用next()时，它会读取下一个单词。您的第一行有两个字Carey和Blem#ITA#6#---#4m49.8。当您从一行读取单词时，需要使用nextLine()转到下一行。

我怀疑你真正想要的是

Scanner sc = new Scanner(scFile.nextLine()).useDelimiter("#");

一次读一整行。

Answer 2

我不完全确定出了什么问题，但我根本不会使用Scanner读取文件。我会使用BufferedReader和循环，而readline方法不返回null。然后我将使用String类的split方法来获取所需的信息。例如

public RecordManager(){
  int pos;
  String line;
  String[] info;
  try {
    BufferedReader scFile = new BufferedReader(new FileReader(new File("resultdata.txt")));
    line = scFile.readLine();
    while(line != null){
        info = line.split("#");//now athlete is in index 0, country at index 1 etc              
        if("WRC".equals(info[3])){
            resultArr[size] = new WorldRecord(info[0], info[1], info[2], info[4]);
        }
        else if("OLR".equals(info[3])){
            resultArr[size] = new OlympicRecord(info[0], info[1], info[2], info[4]);
        }
        else{
            resultArr[size] = new RaceResult(info[0], info[1], info[2], info[4]);
        }
        size++;
        line = scFile.readLine();
     }
  } catch (FileNotFoundException ex) {
    Logger.getLogger(RecordManager.class.getName()).log(Level.SEVERE, null, ex);
  }
}

我知道它并没有直接回答你的代码是什么，但它提供了另一种方法来做你需要的。我希望它无论如何都有帮助。

为什么这段代码不能读取我的文件？

2 个答案: