[Java Introduction] Complete guide to creating a bulletin board app | Detailed explanation of posting, displaying, and saving

programming

"I'm studying Java, but I don't know what to make."
"I want to build my confidence by creating an app that actually works."
This is perfect for those with such concerns.Building your own bulletin board appis.

In this app,Posting, Listing, Saving, LoadingThrough basic functions such as
JavaClass design, file operations, list processing, string operationsYou can learn a wide range of subjects, including:

In this article,A simple bulletin board app that even beginners can useWe will carefully explain the steps to create this, with code included.

What is a bulletin board app?

This is a learning task that anyone can create and apply.

Conclusion: Message boards are the best learning material for learning the basic structure of "input → save → display."

By experiencing the flow of posting, list display, and saving and loading to a file,
You will learn the basics of Java in a natural way.

The Ministry of Education, Culture, Sports, Science and Technology's "information literacy" training policy also states:Understanding the mechanisms for storing, sharing, and utilizing informationis recommended.
(Source: https://www.mext.go.jp/a_menu/shotou/zyouhou/detail/1375607.htm)

Considering the functional design of a bulletin board app

There are only three features you need

Conclusion: You can create a functional bulletin board that is easy to learn with just the basic functions listed below.

  • Post (Enter your name and message to add)
  • List view (display past posts)
  • Save/load (record posted content to a file)

The class structure is as follows:

1

Creating the Post Class

A structure that holds a name, message, and date and time

1
)); } ); 3) 012];

Main class: BulletinBoard implementation

Consolidating posting, display, and storage functions

1
; ( ); ; ); ; ); ; ); } } } ); } } ; ); } } }

Common errors and how to fix them

Notes on files and input

  • Be careful with line breaks and spaces
  • When saving, unify the character code (UTF-8)
  • If your post isn't showing split() or null Check the check

Level up with application ideas

You can also add a GUI and keyword search.

  • SwingTransform it into a GUI bulletin board
  • Add a delete function by adding an ID to a post
  • Keyword search (partial match) and posting date sorting

Complete code summary and configuration

  • Post.java: Post data management class
  • BulletinBoard.java: Posting, listing, and saving
  • posts.txt: The text file where the posts are actually saved

Summary: You can learn all the basics of Java on the message boards

In this article,Bulletin board app made with JavaWe explained how to create it.

Skills you will acquire:

  • Division of roles between classes and methods
  • List processing and data persistence (storage)
  • Practical file manipulation and pretty output

Customize this app to your liking."The only bulletin board in the world"Let's grow it into a great success!

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