Скачать или смотреть How to Fix java.text.ParseException: Troubleshooting Date Parsing Issues in Java

Learn how to resolve `java.text.ParseException` errors when parsing dates in Java with our comprehensive guide. Dive into common issues and their straightforward solutions.
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This video is based on the question https://stackoverflow.com/q/72621667/ asked by the user 'YeJong Choe' ( https://stackoverflow.com/u/8838695/ ) and on the answer https://stackoverflow.com/a/72621804/ provided by the user 'Swayangjit' ( https://stackoverflow.com/u/5213857/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fixing java.text.ParseException: Parsing Dates Correctly in Java

Parsing dates in Java can sometimes present challenges, especially when dealing with specific formats. A common error developers encounter is the java.text.ParseException, which indicates that the date string you are trying to parse doesn't match the expected format. Today, we will dive into a common scenario where this issue arises and provide a clear, step-by-step guide on how to fix it.

The Problem: Unparseable Date Exception

Imagine you're working on an Android application and need to convert a date string into a Date object for further processing. You write a simple piece of code:

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

Upon execution, you encounter the error message:

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

This means that your date string does not match the format defined in SimpleDateFormat, leading to parsing issues and ultimately throwing an exception.

The Solution: Correcting the Date Format

To fix the ParseException, you need to ensure that the format of your date string matches the format specified in SimpleDateFormat. Here's how to navigate this problem effectively:

1. Understand SimpleDateFormat Pattern

SimpleDateFormat uses certain patterns to define the structure of the date:

MMMM represents the full month name (e.g., November).

d represents the day of the month (e.g., 7).

yyyy represents the year (e.g., 2022).

h is for the hour (in 12-hour format) without leading zeros (e.g., 1).

mm represents minutes (e.g., 33).

2. Correct the Time Formatting

In your original code, note how the hour (h) is specified. If the hour in your date string is expressed in 24-hour format (like 13 for 1 PM), you should use HH instead of h.
This adjustment is crucial as it aligns the expected format with the provided date string.

3. Implement the Fix

Here’s the revised code that corrects the date parsing error:

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

4. Test Your Implementation

After you have made the necessary changes, compile and run your code again. You should no longer encounter the ParseException, and the date should be printed correctly.

Conclusion

Handling date formatting in Java can often lead to complications, especially if the format does not align with the expected pattern. By ensuring that your SimpleDateFormat configuration mirrors the date string structure, you can effectively prevent parsing errors.

Remember, if you ever find yourself caught in a web of format issues, always take a moment to verify each component (day, month, year, hour, minute) aligns properly. With these steps, you should be well on your way to effortlessly managing dates in your Java applications.