[Introduction to Java] A complete guide to creating a chat-style UI app | Have fun learning GUI with Swing!

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"I want to make an app in Java, but it looks plain and boring."
"I want to create an interactive screen like a chat app."
I'm sure there are many Java beginners out there who have the same concerns.

In this article, we will use the Java GUI library Swing toHow to recreate a chat-like UIWe will explain it in detail.
Input field, message display field, send buttonIt is a practical configuration that anyone can make.

So that even beginners can understand,Easy-to-understand explanations with code and diagramsWe will continue to do so.

Benefits of creating a chat-like UI

Why is chat the best format for learning?

Conclusion: Because you can learn the basics of screens, events, and layout in one app.

In recent apps,Chat-style UI like LINE or Slackis commonly used.
If you use a GUI library (Swing) in Java,Simple chat-like UIIt is possible to reproduce.

Benefits of learning:

  • JTextAreaandJTextFieldinScreen layoutLearn
  • ActionListenerinEvent Processing FlowI can understand
  • ComponentLayout and designIt is also useful for the application of

Consider the basic structure of the chat UI

Only 3 parts required

Conclusion: You can create a basic chat UI using the following three things:

  1. JTextArea(Message display area)
  2. JTextField(Input field)
  3. JButton(Submit button)

These are arranged vertically, and when the button is pressed,
Simply add the entered text to the area above.Chat-like appearanceIt will be.

Actual screen and configuration code

Steps to implement a chat-like UI in Java

Conclusion: It's easy to make once you understand event handling and text concatenation.

1
400, 400 ); }

Common mistakes and how to fix them

Causes and solutions for no display or no input

Conclusion: Event registration, display updates, and layout specification are key.

  • setVisible(true) but main Is it missing outside?
  • JTextArea of JScrollPane Are you putting it in?
  • setLayout(new BorderLayout()) Haven't you forgotten?

If you forget these,Nothing is displayed/UI is brokenThis leads to the following error.

Application ideas and step-up

How can we further develop the chat-like UI?

Examples of recommended features:

  • Return bot-like replies (if statements or random)
  • Save input history to a file
  • Log output with date and time (LocalDateTime)

Completed code summary

1
// //

The GUI will work and you will be able to send messages using the send button.

Summary: Lessons learned from chat UI

In this article,How to create a chat-like UI in JavaWe explained the following in detail.

What I learned:

  • JTextArea・JTextField・JButtonHow to use
  • Event listener processing flow
  • Positioning method using Layout (BorderLayout)
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