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Скачать или смотреть Understanding Getters and Setters in Kotlin: Avoiding the StackOverflowError

  • vlogize
  • 2025-05-27
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Understanding Getters and Setters in Kotlin: Avoiding the StackOverflowError
Error while using getters and setters in kotlinkotlingetter setter
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Описание к видео Understanding Getters and Setters in Kotlin: Avoiding the StackOverflowError

Discover how to correctly implement getters and setters in Kotlin and avoid common pitfalls like StackOverflowError. Learn how to properly use the `field` keyword for more effective code.
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This video is based on the question https://stackoverflow.com/q/65828387/ asked by the user 'Aditya Dixit' ( https://stackoverflow.com/u/14809209/ ) and on the answer https://stackoverflow.com/a/65828635/ provided by the user 'Sinner of the System' ( https://stackoverflow.com/u/14487370/ ) 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: Error while using getters and setters in kotlin

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
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.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
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Understanding Getters and Setters in Kotlin: Avoiding the StackOverflowError

Kotlin provides a powerful way to encapsulate properties in classes via getters and setters. However, if not implemented correctly, you could run into frustrating issues, like the StackOverflowError you encountered while trying to use a custom getter. Today, we will explore why this happens and how to fix it.

The Problem: StackOverflowError

In your example, you wrote a getter that caused an infinite recursion, which resulted in the following error when executing your code:

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

Here’s a simple breakdown of your code:

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

The Cause of the Error

Let's analyze what happens in this implementation:

Property Declaration: You declare a property myCar with a backing field initialized to "BMW".

Custom Getter: You define a getter that tries to access this.myCar.toLowerCase().

Infinite Loop: When you call this.myCar, it refers to the getter itself instead of the backing field, so it keeps calling itself — leading to infinite recursion.

This recursion eventually leads to a StackOverflowError when there is no space left to handle the calls.

The Solution: Using the field Keyword

To prevent this error, you need to use the field keyword. The field keyword implicitly refers to the backing field of the property. Here is how you can rewrite your getter correctly:

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

Explanation of the Solution

Using field:

By using field, you directly access the backing field (myCar), which holds the actual value.

This means the getter will now return the value while transforming it to lowercase correctly.

Getting the Expected Output:

When you call the getter on the car object, you will receive "bmw" instead of getting stuck in an infinite loop.

Conclusion

By understanding the use of the field keyword, you can avoid recursive calls in your getters and prevent common runtime exceptions like StackOverflowError. In summary:

Always use field when you want to refer to the backing property inside getter, setter, or custom method.

Remember that recursive calls in properties can lead to critical errors and make debugging more complex.

By applying these principles, you will write cleaner and more effective Kotlin code. Happy coding!

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