Скачать или смотреть How to Switch Between Panels in Java Swing with Ease

Learn how to effectively switch between different panels in a Java Swing application by using an efficient structure for your main class and utilizing existing panel instances.
---
This video is based on the question https://stackoverflow.com/q/63142279/ asked by the user 'Harrison 01233' ( https://stackoverflow.com/u/14001052/ ) and on the answer https://stackoverflow.com/a/63146002/ provided by the user 'Peter Parker' ( https://stackoverflow.com/u/10435723/ ) 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: Switch between panels using a button inside one of them

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.
---
Understanding the Problem: Switching Between Panels in Java Swing

If you're working on a Java Swing application, you may encounter a common scenario: needing to switch between different panels with the click of a button. Many developers face hurdles, especially when they find that clicking a button—intended to trigger a panel switch—doesn't yield expected results. This is a problem that needs to be addressed if you are to create a smooth user interface.

What's Going Wrong?

In your application, you create a JFrame that can receive JPanels. When the program starts, you successfully show one of these panels. However, when clicking on a button inside this panel—specifically a JLabel with a MouseListener—nothing happens. The reason? You're unintentionally creating a new instance of MainPanel instead of manipulating the existing, visible instance.

The Solution: An Organized Main Class Structure

The key to solving this issue lies in how you manage instances of your panels. Here's a comprehensive solution that will help you switch between panels effectively.

1. Create a Main Class

Instead of modifying the MainPanel directly, create a new class named Main inside your Vista package. This class will handle the creation of the main frame and existing panels.

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

Key Points:

This allows you to maintain existing instances of your scenes.

You can access your panels using Main.firstScene, Main.secondScene, and Main.mainPanel across your application.

2. Modify Mouse Click Listener

Next, update your event listener inside scene0. When the jLabel1 is clicked, instead of creating a new instance of MainPanel, directly call the existing main panel's method to load scene1.

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

Key Advantage:

This adjustment ensures you're interacting with the already visible panel, leading to the desired outcome.

3. Update the Panel Loading Methods

Lastly, modify how your methods sol() and loadscene1() work in MainPanel. This adaptation will ensure your panels are displayed correctly.

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

Result:

sol() shows the first scene when the application starts, and loadscene1() switches to the second scene when prompted.

Conclusion

With this structured approach in mind, you can seamlessly switch between panels in your Java Swing applications. Remember to always utilize existing instances rather than creating new ones when working with graphical interfaces. This technique not only simplifies your code but also enhances the performance of your application.

Note: While this solution is not tested, it should work according to the guidelines provided. Happy coding!