Скачать или смотреть How to Display Data in TableView of Nested Objects in JavaFX

Learn how to effectively show properties of nested objects in a JavaFX `TableView` using custom cell implementations and lambda expressions.
---
This video is based on the question https://stackoverflow.com/q/68243155/ asked by the user 'Wortig' ( https://stackoverflow.com/u/10524503/ ) and on the answer https://stackoverflow.com/a/68243299/ provided by the user 'Slaw' ( https://stackoverflow.com/u/6395627/ ) 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 show data in TableView of nested objects?

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 Display Data in TableView of Nested Objects in JavaFX

If you've ever tried to display complex nested objects in a JavaFX TableView, you might have encountered issues, such as exceptions indicating that properties can't be read. This is particularly true when dealing with classes that reference other objects. In this post, we will explore a common issue faced while trying to display a Marriage object which contains nested Groom and Bride classes in a TableView, and demonstrate how to properly set up the CellValueFactory for such cases.

The Problem

Let's begin by examining the structure of our data. We have a Marriage class that looks like this:

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

The Groom and Bride classes are structured to hold their respective first and last names:

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

When trying to set the CellValueFactory for the TableView, an exception is thrown as shown below:

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

This indicates that the TableView is unable to access the properties of the nested Groom and Bride objects directly through the Marriage class.

The Solution

To resolve this issue, we can utilize a custom cell implementation that knows how to extract and display the necessary information from both the Groom and Bride objects. Here’s how we can do it step-by-step:

Step 1: Modify the TableColumn

We need to create a TableColumn for Groom that will be populated with both the first name and last name. The declaration looks like this:

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

Step 2: Create a Custom Cell Factory

Next, we will define how this column displays the data. By implementing a custom cell factory, we can format the output as desired:

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

Step 3: Repeat for the Bride Column

You can similarly set up the column for the Bride.

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

Step 4: Utilize JavaFX Properties for Better Code Practices

While the above implementation works, consider using JavaFX properties to avoid the "PropertyValueFactory" pitfalls:

Modify the Marriage Class to include JavaFX ObjectProperties:

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

Set CellValueFactory Using Lambda Expressions for better compile-time safety:

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

Conclusion

In summary, to display nested object properties in a JavaFX TableView, a combination of custom cell factories and JavaFX properties can make the process much more straightforward and maintainable. By using these strategies, you will ensure that your application runs smoothly and displays data efficiently without encountering access exceptions. Furthermore, consider whether you need separate Groom and Bride classes or if they could be combined into a single Person class to simplify your data model.

Now, you can easily display complex nested objects in your TableView confidently. Happy coding!