How to Create a List of Lists in Java for Software Release Versions

Learn how to effectively group software release versions in Java using a list of lists. This guide breaks down the steps to achieve clean and organized version management in your applications.
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This video is based on the question https://stackoverflow.com/q/68831475/ asked by the user 'ivan kolev' ( https://stackoverflow.com/u/16333840/ ) and on the answer https://stackoverflow.com/a/68831933/ provided by the user 'Nowhere Man' ( https://stackoverflow.com/u/13279831/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Create a List of Lists in Java for Software Release Versions

Managing software releases can be tricky, especially when it comes to organizing different versions efficiently. If you have a list of version strings and want to categorize them into a list of lists - where each sublist represents a different major release - this guide will guide you through the process in Java.

The Problem

Imagine you have a list of version numbers for your software releases, and you want to group them according to their major versions. For instance, given a list:

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You want the output to look like:

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This way, each sublist contains versions that correspond to a specific major release.

The Solution: Group and Sort Versions

To achieve this in Java, we can utilize Java Streams and the Collectors class. Below is a step-by-step breakdown of how to implement this:

Step 1: Create the List of Versions

First, we initialize our list of version strings:

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Step 2: Group the Versions

We can use the Collectors.groupingBy() method to group these versions. We’ll consider the major and minor prefixes (the part before the last dot) as the key for our grouping. Here’s the code that does this:

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Step 3: Sort Each Group

Once grouped, we need to ensure that each sublist of versions is sorted for clarity. We can achieve this with a simple forEach loop:

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Step 4: Print the Final Group

Finally, we can print each group to see the organized versioning.

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Complete Java Example

Here’s the complete code:

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Handling Edge Cases

In practice, you may want to account for versions that do not strictly follow the major.minor format, such as 0.1 or 1.0.2.1. For this, modify the grouping criteria accordingly:

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This way, you ensure that your versioning remains accurate regardless of minor discrepancies in version formats.

Example of Groovy Implementation

If you prefer Groovy, the implementation can be quite straightforward as well:

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Conclusion

Creating a list of lists to manage software version releases effectively helps maintain clarity in your versioning strategy. By leveraging Java Streams and Collectors, you can categorize and organize your data efficiently. Happy coding!

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