Скачать или смотреть How to Store Values from JTextField and Pass Them to Another Class for Computation in Java Swing

Learn how to effectively capture user input from `JTextField`, perform calculations, and display results in a Java Swing application.
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This video is based on the question https://stackoverflow.com/q/62318856/ asked by the user 'Shashwata Saha' ( https://stackoverflow.com/u/13301184/ ) and on the answer https://stackoverflow.com/a/62320381/ provided by the user 'Asmoun' ( https://stackoverflow.com/u/13470437/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Store Values from JTextField and Pass Them to Another Class for Computation in Java Swing

Java Swing is a popular toolkit for creating graphical user interfaces (GUIs) in Java. If you're new to Java and Swing, you might find yourself struggling with how to handle user input effectively. One common task is to capture input values from JTextField, process those values, and then display the results. This guide will guide you in capturing data from JTextField and passing it to another class for computation.

The Problem

You want to capture the following values from the user:

vdata (a String)

vshift (an int)

vgroup (an int)

These values are entered through JTextField components in your GUI. You want to collect these values upon clicking a button (Button 1) and then pass them to another method for computation. Additionally, upon clicking a second button (Button 2), the GUI should close. Finally, you wish to display the computed results back in the GUI, preferably using an immutable text display.

Solution Overview

To functionally achieve this, we will:

Capture Input Values from JTextField.

Perform Computation on these values.

Display the Computed Result in the GUI.

Close the GUI when required.

Step 1: Capture Input Values

Here’s how you can capture values from your JTextField components when Button 1 is clicked:

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

Step 2: Performing Computation

In this example, we'll define a method called compute that takes vshift and vgroup as parameters and performs a simple computation (like addition):

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

Step 3: Displaying the Computed Result

Instead of using a JTextArea, which allows for editable content, we will utilize a JLabel to display the computed result. Below is the change in your GUI setup:

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

And remove the line that adds the JTextArea from the panel:

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

Step 4: Closing the GUI

To ensure that the GUI can be closed cleanly, we will define the action for Button 2 like so:

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

Conclusion

By following the steps outlined above, you have now learned how to:

Capture input from JTextField.

Pass those values to a computation method.

Display the results immutably in the GUI.

Close the GUI gracefully.

Using JLabel for displaying results avoids accidental edits that come with text areas. This makes your application user-friendly and efficient. Whether you are working on a minor GUI project or a larger Java application, these principles can help you manage user input effectively.

Make sure to experiment with the code and see how changing values influences the computation. Happy coding!