Question

我需要帮助创建一个类，允许我读取一个文本文件，其中包含将存储到单个变量中的玩家数据，然后是数组。需要存储的变量是name，day，month，year，country，previousTeams []例如，文本文件中的一行将显示Cristiano Ronaldo，1986年，19，05，葡萄牙，曼联;皇马。

目前我最大的困难是试图了解如何将数组存储在文本文件中，如果有人能帮我解决这个问题，我将非常感激。

非常感谢大家的答案，我将如何使用拆分将数据提取到数组中？从这个例子来看，我试图将曼联和皇家马德里存放在阵列中使用＆＃34 ;;＆＃34;用于指定要存储到数组中的下一个String的分隔符。这就是我想出来的，但还远未完成：

    while(input.hasNext()){
        String name = input.next();
        int day = input.nextInt();
        int month = input.nextInt();
        int year = input.nextInt();
        String country = input.next();
        String previousTeams[] = ?;
    }

谢谢

Answer 1

我最近从csv文件中提取了数据，并在读取后将内容放入类中。如下所示，您可以调整此值以适合txt文件。

private ArrayList<Solar> sols;


sols = new ArrayList();
BufferedReader crunchifyBuffer = null;
final String DELIMITER = ",";


    try {
        crunchifyBuffer = new BufferedReader(new FileReader("C:\\Users\\xxxx\\Documents\\Molar Forecasts\\fs-rad.20170421.21.csv"));
    } catch (FileNotFoundException ex) {
        Logger.getLogger(JavaApplication1.class.getName()).log(Level.SEVERE, null, ex);
    }
                String line = null;
    try {
        line = crunchifyBuffer.readLine(); // Read first line
    } catch (IOException ex) {
        Logger.getLogger(JavaApplication1.class.getName()).log(Level.SEVERE, null, ex);
    }
if (line != null) { try {
    // Check it's not null
    //   line = crunchifyBuffer.readLine(); // Read second line
    while ((line = crunchifyBuffer.readLine()) != null)
    {
        //Get all tokens available in line
        String[] tokens = line.split(DELIMITER);
        Solar sol = new Solar(tokens[0], tokens[1], tokens[2], Double.parseDouble(tokens[3]));

        sols.add(sol);

    }   } catch (IOException ex) {
        Logger.getLogger(JavaApplication1.class.getName()).log(Level.SEVERE, null, ex);
    }

}}

我的课程如下：

class Solar {
    private String station;
    private String period;
    private String forecasttime;
    private Double forecast;


    public String details(){
      return period;
   }

   public Double details1() {
      return forecast;
   }



    public Solar(String station, String period, String forecasttime,Double forecast) {
        this.station = station;
        this.period = period;
        this.forecasttime = forecasttime;
        this.forecast = forecast;
    }

    public String getName() {
        return station;
    }

    public void setName(String station) {
        this.station = station;
    }

    public String getPrice() {
        return period;
    }

    public void setPrice(String period) {
        this.period = period;
    }

    public String getAuthor() {
        return forecasttime;
    }

    public void setAuthor(String forecasttime) {
        this.forecasttime = forecasttime;
    }

     public Double getAuthor1() {
        return forecast;
    }

    public void setAuthor1(Double forecast) {
        this.forecast = forecast;
    }



}

Answer 2

您可以使用split从行中提取信息，这是一个示例，从文本到数组：

String str = "Cristiano Ronaldo, 19, 05, 1986, Portugal, Manchester United ; Real Madrid";
String[] spl = str.split("[,;]");

<强>输出

Cristiano Ronaldo,  
19,  
05,  
1986,  
Portugal,  
Manchester United ,  
Real Madrid

Answer 3

我假设每个字段都有数据。 [即数据将以'，'分隔，之前的团队将以';'分隔＆安培;单人游戏数据存储在单行中]

首先，您应该确定问题中的成员我把“玩家”作为一个实体。

我们需要创建一个播放器对象的数组/列表来解决问题

这是输入文件包含的数据：

克里斯蒂亚诺罗纳尔多，1986年5月19日，葡萄牙，曼彻斯特联队;皇马

Rahul Dravid，1986年5月19日，印度，RCB; RR; DD

ABD，19,05,1986，南非，DD; RCB

Dhoni，1986年5月19日，印度，CSK; RPS

R.Jadeja，1986年5月19日，印度，CSK; GL

以下代码将完成工作我想：

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Reader {
    public static void main(String[] a) {
        try{
            String absoluteFilePath = "You Input File Absolute Path";
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(new FileInputStream(absoluteFilePath)));
            String singleEntry = null;
            Player player;
            // Iterate through the file content line by line
            while((singleEntry = bufferedReader.readLine())!=null) {

                // process each line and convert it into a object of player
                // that will be easier to handle going forward
                player = getPlayer(singleEntry);

                // Do anything you want to do with Player
                // I have just printed it out
                System.out.println(getPlayer(singleEntry));
            }
            bufferedReader.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static Player getPlayer(String input) {
        Player player = new Player();

        // Tokenizer to break the line into tokens i.e information (here name, day etc)
        StringTokenizer stringTokenizer = new StringTokenizer(input);

        player.setName(stringTokenizer.nextToken(",").trim()); // trim() Just to remove spaces 

        player.setDay(Integer.parseInt(stringTokenizer.nextToken(",").trim())); // trim() Just to remove spaces

        player.setMonth(Integer.parseInt(stringTokenizer.nextToken(",").trim())); // trim() Just to remove spaces

        player.setYear(Integer.parseInt(stringTokenizer.nextToken(",").trim())); // trim() Just to remove spaces

        player.setCountry(stringTokenizer.nextToken(",").trim()); // trim() Just to remove spaces

        player.setPreviousTeams(stringTokenizer.nextToken(",").trim().split("[;]")); // trim() Just to remove spaces

        return player;
    }
}



import java.util.Arrays;

public class Player {
    private String name;
    private int day;
    private int month;
    private int year;
    private String country;
    private String[] previousTeams;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getDay() {
        return day;
    }
    public void setDay(int day) {
        this.day = day;
    }
    public int getMonth() {
        return month;
    }
    public void setMonth(int month) {
        this.month = month;
    }
    public int getYear() {
        return year;
    }
    public void setYear(int year) {
        this.year = year;
    }
    public String getCountry() {
        return country;
    }
    public void setCountry(String country) {
        this.country = country;
    }
    public String[] getPreviousTeams() {
        return previousTeams;
    }
    public void setPreviousTeams(String[] previousTeams) {
        this.previousTeams = previousTeams;
    }
    @Override
    public String toString() {
        return "Player [name=" + name + ", day=" + day + ", month=" + month + ", year=" + year + ", country=" + country
                + ", previousTeams=" + Arrays.toString(previousTeams) + "]";
    }   
}

将文本数据从文本文件读取到包含数组的对象中

3 个答案: