Скачать или смотреть Understanding Why Your FileReader Is Skipping Lines in a CSV File

Discover the cause of the `FileReader` skipping every other line in your CSV file and learn how to fix it efficiently.
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This video is based on the question https://stackoverflow.com/q/67370207/ asked by the user 'Java' ( https://stackoverflow.com/u/15447840/ ) and on the answer https://stackoverflow.com/a/67370284/ provided by the user 'Unmitigated' ( https://stackoverflow.com/u/9513184/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Addressing the Issue of Skipped Lines in CSV Files with Java FileReader

When working with CSV (Comma Separated Values) files in Java, developers may occasionally encounter an issue where their code seems to skip every other line. This behavior can be confusing and often leads to unexpected results. In this guide, we will dive into the detailed cause of this issue and provide a clear solution to ensure that all lines in your CSV file are read correctly.

The Problem: Skipped Lines in Your CSV Reader

The core of the problem lies in the way the BufferedReader reads lines from a CSV file. Here’s a brief overview of the situation:

You’re using a BufferedReader alongside FileReader to process a CSV file that has multiple columns.

The code provided indicates that lines are being read, but every second line appears to be missed entirely.

The culprit is a series of calls to the readLine() method that leads to unintended skipping of lines.

Example Code Snippet Causing the Issue

Take a look at the problematic code below:

[[See Video to Reveal this Text or Code Snippet]]

The code is intended to read each line and extract data from it, but because readLine() is called twice within the loop, it leads to skipping lines.

The Solution: Correcting the Code

Step-by-Step Fix

Store the Read Line: Instead of calling readLine() twice, we need to store the result of the first call into a variable.

Use That Variable: Utilize the variable in the subsequent operations to extract and parse the data.

Updated Code Snippet

Here’s how the corrected code should look:

[[See Video to Reveal this Text or Code Snippet]]

Key Adjustments Made

Single Call to readLine(): Now, the loop continuously reads a line and processes it without skipping any lines.

Variable Utilization: The line read from the file is stored in the line variable, which can then be manipulated and split for further processing.

Conclusion

The issue of FileReader skipping every other line in your CSV file can be easily resolved by ensuring that you read each line only once within your loop. By storing the result of readLine() and working with that variable, you can effectively avoid any unintended skips. This simple adjustment will assist in ensuring that your CSV data is fully and accurately processed, allowing you to focus on building more robust Java applications.

Make sure to test your changes thoroughly and happy coding!