Скачать или смотреть How to Draw a 2D Rectangle in Java GUI Using Jtextfield Inputs

Learn how to create a Java GUI application that displays a 2D rectangle based on user inputs from Jtextfield. Follow our step-by-step guide to implement this feature seamlessly.
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This video is based on the question https://stackoverflow.com/q/72723872/ asked by the user 'latino_salamander' ( https://stackoverflow.com/u/19314770/ ) and on the answer https://stackoverflow.com/a/72724285/ provided by the user 'sorifiend' ( https://stackoverflow.com/u/1270000/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Drawing a 2D Rectangle in Java GUI Using JTextField Inputs

Creating graphical interfaces in Java can be an exciting challenge. Are you looking to draw a 2D rectangle based on user inputs from JTextFields? If you've ever faced issues while trying to implement this feature in your Java GUI application, you are not alone. Let's break down the problem and provide a detailed solution that will help you display that rectangle effortlessly!

The Problem

You have a setup where user inputs, specifically coordinates and dimensions for a rectangle, come from JTextFields. You want to utilize these values to draw a rectangle on a JPanel but are facing errors with the drawing mechanism, particularly with the method drawpanel.draw(rect) leading to non-functional outputs in your current java application.

The Questions You Have:

Are the overrides in the correct locations within my code?

Is there a simpler way to achieve the outcome I desire?

The Solution

Breaking down the solution involves several key steps that improve your existing approach. Here's how to resolve the issue and successfully draw a rectangle in your Java application.

Step 1: Create a New Draw Method

The first action we need to take is to modify your Kpackage class. To do this, we will add a draw method that accepts a rectangle as an argument.

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

Step 2: Use an ArrayList to Store Rectangles

Next, you need to maintain a list that keeps track of all the rectangles that the user wants to draw. This will be done by declaring an ArrayList:

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

Step 3: Update the Paint Component Method

Now, in the paintComponent method, leverage the ArrayList to loop through each rectangle and draw them accordingly.

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

Step 4: Modify Your ActionListener Code

In the actionPerformed method of your die class, your existing drawing code stays the same:

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

Final Thoughts

By implementing these steps, you’ll ensure that rectangles are successfully drawn on the JPanel based on user inputs without running into issues. The organized code structure facilitates maintainability and readability, allowing for further enhancements down the line.

In conclusion, remember that when constructing GUI components in Java, especially with dynamic graphical representations, you must consider ways to update your display systematically, which often involves using collections like ArrayLists to manage drawn objects.

Take on your GUI project with confidence, knowing that you can visualize shapes seamlessly through user interactions! If you have any further questions or need additional insights, feel free to ask!