如何将 .csv 文件读入 java 中的数组列表? [英] How to read a .csv file into an array list in java?

问题描述

我有一项大学作业，要求我从 .csv 文件中获取数据，并使用三种不同的方法读取、处理和打印它.这些说明要求我将数据读入数组列表中，我为此编写了一些代码，但我不确定我是否正确完成了操作.有人能帮我理解我应该如何将文件读入数组列表吗?

I have an assignment for college that requires I take data from a .csv file and read it, process it, and print it in three separate methods. The instructions require that I read the data into an array list I have written some code to do so but I'm just not sure if I've done it correctly. Could someone help me understand how exactly I am supposed to read the file into an array list?

我的代码:

public void readData() throws IOException { 
    int count = 0;
    String file = "bank-Detail.txt";
    try {
        BufferedReader br = new BufferedReader(new FileReader(file));
        String line = "";
        while ((line = br.readLine()) != null) {

            bank.add(line.split(","));

            String[][] v = (String[][]) bank.toArray(new String[bank.size()][12]);

        }
    } catch (FileNotFoundException e) {

    }
}

推荐答案

你不需要 2D 数组来存储文件内容，一个 String[] 数组的列表就可以了，例如:

You don't need 2D array to store the file content, a list of String[] arrays would do, e.g:

public List<String[]> readData() throws IOException { 
    int count = 0;
    String file = "bank-Detail.txt";
    List<String[]> content = new ArrayList<>();
    try(BufferedReader br = new BufferedReader(new FileReader(file))) {
        String line = "";
        while ((line = br.readLine()) != null) {
            content.add(line.split(","));
        }
    } catch (FileNotFoundException e) {
      //Some error logging
    }
    return content;
}

此外，最好在本地声明 list 并从 method 返回它，而不是将元素添加到共享的 list ('银行')在你的情况下.

Also, it's good practice to declare the list locally and return it from the method rather than adding elements into a shared list ('bank') in your case.

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