Скачать или смотреть How to Format Long Values to Human Readable File Sizes in JavaFX

Discover how to bind a SimpleLongProperty to a Label in JavaFX, and format long values into easily readable file sizes like "1MB" rather than displaying raw long numbers.
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This video is based on the question https://stackoverflow.com/q/72576728/ asked by the user 'kanka.dev' ( https://stackoverflow.com/u/15974441/ ) and on the answer https://stackoverflow.com/a/72576814/ provided by the user 'James_D' ( https://stackoverflow.com/u/2189127/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Formatting Long Values to Human Readable File Sizes in JavaFX

When working with JavaFX applications, binding properties to UI components can greatly enhance user experience. In many cases, you might want to display data in a more readable format. One common use case is converting raw long values into human-readable file sizes.

The Problem

Imagine you have a JavaFX Label that needs to display not only the count of deleted files but also their total size in a more user-friendly format. For instance, instead of showing 1000000, you would like the label to display 1MB. This conversion can significantly improve the readability of your application.

You might already have a setup where one property is an integer that counts the deleted files, but the property holding the size is a SimpleLongProperty. The challenge is how to efficiently bind this property to a label while also formatting the output.

The Solution

To achieve this, we can leverage JavaFX's powerful binding capabilities. Specifically, we will use Bindings.createStringBinding(...) to format the long value.

Step-by-Step Implementation

Create the Human Readable Size Function
First, you already have a function that transforms a long value into a readable format. Here's a quick overview of your existing humanReadableByteCount function:

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

Bind the Label to Properties
You'll want to bind your label to both the file count and the file size using a string binding. Here's how you can do it:

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

Explanation of Key Components

Bindings.createStringBinding(...): This method creates a string binding that will update whenever the specified properties change. In our case, it updates whenever either deletedFilesCountProperty or deletedFilesSizeProperty change.

Lambda Expression: The part ( ) -> ... is a lambda expression where you define how to compute the string value that you want to display in the label.

String.format(...): This method formats the string using placeholders %d for integers and %s for strings, which allows for clear output in the label.

Complete JavaFX Controller Example

Putting this all together, your JavaFX controller might look something like this:

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

Conclusion

By effectively using Bindings.createStringBinding(...), you can easily convert and display long values as human-readable file sizes in your JavaFX applications. Not only does this enhance the user interface, but it also makes it easier for users to understand the information being presented.

Implement this practice to ensure your applications remain intuitive and user-friendly! If you have any questions or need further assistance, feel free to comment below!