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Learn how to streamline your Java code by reducing duplication and improving maintainability using method extraction techniques.
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This video is based on the question https://stackoverflow.com/q/68177187/ asked by the user 'Doyel Mishra' ( https://stackoverflow.com/u/13310114/ ) and on the answer https://stackoverflow.com/a/68177323/ provided by the user 'Fildor' ( https://stackoverflow.com/u/982149/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Eliminate Code Duplication in Java with a Simple Method Refactor

In software development, code duplication is often a problem that can lead to maintenance challenges and increased risk of bugs. In this guide, we’ll explore how to address this issue in Java, specifically when you're dealing with similar for-each loops in multiple methods.

The Problem

You're faced with two pieces of Java code that perform almost identical operations in separate methods. Each method processes a collection of AjaxControlBean objects. The key difference between the two is a single line of code, which involves setting an index for each data instance. Your objective is to reduce redundancy and improve clarity by eliminating this duplication.

Example Code Snippets

Here's a closer look at the original code snippets:

First Code Snippet

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Second Code Snippet

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Notice the only difference is the line data.setIdx(i+ + ); in the second snippet, which tracks the index of the values.

The Solution

To reduce code duplication, we can extract the repetitive block of logic dealing with FormInstanceData into a separate method. Here’s how you can do that:

Step-by-Step Refactor

Create a New Method
We’ll define a method addBeanData that takes a FormInstanceControl and an AjaxControlBean as arguments. This method will handle the creation and addition of FormInstanceData.

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Update the Original Loops
Replace the duplicated logic in both code snippets with a call to your new method:

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Benefits of This Approach

Improved Readability: By reducing the amount of repeated code, your methods become easier to read and maintain.

Reduced Risk of Bugs: With a single source of truth for the logic that adds FormInstanceData, it's less likely that you'll introduce inconsistencies in the future.

Easier Modifications: If the logic regarding how data is added needs to change, you’ll only need to update one method rather than multiple places in your code.

Conclusion

Eliminating code duplication is essential for writing clean, maintainable code. By refactoring our Java code as shown above, we've streamlined the process and made our application easier to manage moving forward. Consider these principles in your own projects to ensure effective coding practices!

Final Thoughts

Start refactoring today, and watch your code base transform into a cleaner, more efficient space. Happy coding!