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Скачать или смотреть How to Deserialize Array of Arrays with GSON in Java

  • vlogize
  • 2025-10-05
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How to Deserialize Array of Arrays with GSON in Java
How to deserialize array of arrays with GSONjavajsongson
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Описание к видео How to Deserialize Array of Arrays with GSON in Java

Discover how to effectively handle complex JSON structures in Java using GSON to deserialize array of arrays data.
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This video is based on the question https://stackoverflow.com/q/63959364/ asked by the user 'Makar Nikitin' ( https://stackoverflow.com/u/9442440/ ) and on the answer https://stackoverflow.com/a/63959752/ provided by the user 'Andreas' ( https://stackoverflow.com/u/5221149/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How to deserialize array of arrays with GSON

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The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

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How to Deserialize Array of Arrays with GSON in Java

Handling JSON data is a routine task for developers, especially when working with APIs or storing configurations. However, when it comes to complex structures like arrays of arrays, things can get tricky, particularly in Java with the GSON library. In this guide, we will explore a common problem where you may encounter an error while attempting to deserialize JSON that contains arrays within arrays.

The Problem

Consider the following JSON structure:

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

You want to deserialize this JSON using GSON into a Java object. Here's your initial attempt:

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

Unfortunately, when you run this code, you encounter the following error:

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

This issue arises because GSON expects a JSON object (with key-value pairs) but receives an array instead. Let's delve into a proper solution to overcome this hurdle.

Understanding the JSON Structure

The main reason for the error is that your JSON is structured as an array of arrays, while GSON is set to deserialize it into objects defined by class A. The deserialization expects something like the following:

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

This structure utilizes objects with properties, which GSON can map directly to your Java class.

The Solution

To properly deserialize the array of arrays, we can:

Deserialize the JSON into a list of lists of objects.

Manually convert this mixed type list into the desired format.

Step 1: Change the Type

Instead of trying to map the JSON directly to your class A, we will create a generic structure to accommodate the array of arrays. You'll want to use List<List<Object>>:

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

Step 2: Convert to Your Desired Structure

Next, you will need to loop through this list and manually construct instances of class A:

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

Complete Example

Here’s a complete example combining the above steps:

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

Conclusion

When working with GSON in Java, deserializing JSON data requires understanding the structure of your JSON. If you encounter an array of arrays like in our example, make sure to adjust your deserialization method accordingly. By using a list of lists, you can easily extract and instantiate your desired objects.

Feel free to tweak the code according to your specific needs and explore the vast possibilities that GSON offers when working with JSON data. Happy coding!

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