Скачать или смотреть How to Properly Manage Scanner Objects in Java: Avoiding Resource Leaks

Discover the best practices for managing `Scanner` objects in Java to prevent resource leaks, making your code cleaner and more efficient.
---
This video is based on the question https://stackoverflow.com/q/66773206/ asked by the user 'Danny' ( https://stackoverflow.com/u/15385622/ ) and on the answer https://stackoverflow.com/a/66773367/ provided by the user 'Adebayo' ( https://stackoverflow.com/u/6430614/ ) 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: I can't figure out where to place my second Scanner close, does anyone know if I need add second or do I need an If statement where the while loop is?

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.
---
How to Properly Manage Scanner Objects in Java: Avoiding Resource Leaks

In Java programming, managing resources correctly is crucial for building efficient applications. One common issue developers face is resource leaks, especially when dealing with input objects like Scanner. In this guide, we’ll delve into a specific programming challenge related to using multiple Scanner objects and how to handle them correctly to avoid resource leaks.

The Problem: Resource Leaks with Multiple Scanners

Imagine you’re working on a property tax calculator in Java. You have a Scanner object to read input from the user. However, as you develop your program, you encounter a resource leak because you're not closing your Scanner properly. Specifically, the program uses two Scanner objects: one in the main method and another in the showTax() method.

Here’s an excerpt of what you might encounter in your code:

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

In this scenario, the problem is that each Scanner instance you create must be closed after its use; otherwise, it can lead to memory leaks and tire the resources of the Java Virtual Machine (JVM).

The Solution: Optimize Your Scanner Usage

To effectively manage Scanner objects, it's recommended to create a single instance of Scanner and reuse it throughout your program. Here's how to restructure your code:

Step 1: Make Scanner a Class Field

Instead of creating a new Scanner instance within your showTax() function, make it a static field of your class. This way, you can use the same instance across different methods without creating multiple objects.

Updated Java Code:

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

Step 2: Close the Scanner in the Main Method

By using the keyboard object declared at the class level, you ensure that the Scanner is only instantiated once but can still be used across multiple methods. Finally, you can close the Scanner in the main method after you finish taking inputs.

Conclusion: Clean Code, Clean Resources

By implementing these adjustments, you not only tidy up your code but also optimize resource usage related to Scanner objects. Remember, efficient resource management is a hallmark of a good programmer, and reducing resource leaks will enhance the performance of your applications.

By following this guide, you'll be well on your way to mastering input management in Java. Cheers to cleaner, more efficient code!