java - 根据文件内容创建对象数组

Question

我有一个看起来像这样的文本文件。

BEGINNING OF LIST

Name: Janet
Age: 21
Birthday month: April

END OF LIST

BEGINNING OF LIST

Name: Peter
Age: 34
Birthday month: January

END OF LIST

所以我想获取信息并将其放入一个对象数组中。这是一个广泛的列表，我使用分隔符 beginning of list 和 end of list 来分隔内容。

如何将这些项目存储在对象数组中？

Answer 1

我建议您先创建一个类来存储信息，其中包含name、age 和birthday month 属性。覆盖 toString() 方法是一个很好的做法，这样您就可以整齐地打印出类。

然后您可以通过将每一行拆分为一个单词数组并检查信息来检查每一行是否包含有关姓名、年龄或生日月份的信息。

一旦该行显示为“END OF LIST”，您可以将带有参数的 class Person 添加到 ArrayList。

例如，我使用 “people.txt” 作为文件(确保将文本文档放在包含 .java 文件的 src 文件夹之外) .

主.java

import java.io.*;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class Main {

    public static void main(String[] args)
    {
        BufferedReader bufferedReader = null;
        FileReader fileReader = null;
        String name = null;
        String age = null;
        String month = null;
        List<Person> people = new ArrayList<Person>();

        try
        {
            String fileName = "people.txt";
            fileReader = new FileReader(fileName);
            bufferedReader = new BufferedReader(fileReader);
            String line = null;

            while ((line = bufferedReader.readLine()) != null)
            {
                String[] information = line.split(" ");

                if (Arrays.asList(information).contains("Name:"))
                {
                    name = information[1];
                }
                if (Arrays.asList(information).contains("Age:"))
                {
                    age = information[1];
                }
                if (Arrays.asList(information).contains("month:"))
                {
                    month = information[2];
                }
                if (line.equals("END OF LIST"))
                {
                    people.add(new Person(name, age, month));

                    name = "";
                    age = "";
                    month = "";
                }
            }

            for (Person person : people)
            {
                System.out.println(person);
                System.out.print("\n");
            }
        }
        catch (FileNotFoundException e) 
        {
            System.out.println(e.getMessage());
        } 
        catch (IOException ex) 
        {
            System.out.println("Error reading people.txt");
        }
        finally
        {
            if (bufferedReader != null)
            {
                try
                {
                    bufferedReader.close();
                }
                catch (IOException ex)
                {
                    System.out.println(ex.getMessage());
                }
            }
            if (fileReader != null)
            {
                try
                {
                    fileReader.close();
                }
                catch (IOException ex)
                {
                    System.out.println(ex.getMessage());
                }
            }
        }       
    }
}

Person.java

public class Person {
    private String name;
    private String age;
    private String birthday;

    public Person(String name, String age, String birthday)
    {
        this.name = name;
        this.age = age;
        this.birthday = birthday;
    }

    @Override
    public String toString()
    {
        String information = "Name: " + name + "\nAge: " + age + "\nBirthday: " + birthday;
        return information;
    }
}