When comparing BlueJ vs Atom, the Slant community recommends BlueJ for most people. In the question“What are the best open source IDEs for Java?” BlueJ is ranked 5th while Atom is ranked 6th. The most important reason people chose BlueJ is:
All the features you would expect: syntax highlighting, code-completion, templates, extension-manager, git integration, unit-testing, etc..
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Many features
All the features you would expect: syntax highlighting, code-completion, templates, extension-manager, git integration, unit-testing, etc..
Pro UML start view
Shows UML chart of your project, making it easy to find classes. Helps beginners get familiar with the structure of Java programs.
Pro Great IDE for beginners
BlueJ was created for educational purposes and is designed to be simple for those who are just learning.
Pro Easy to learn
Because BlueJ was created for teaching purposes, it is designed to be easy to use. It has a user-friendly and intuitive interface.
Pro Extensive list of packages
Atom has a built-in package manager and an extensive list of packages.
Pro Built-in package management
Atom was built from the ground up with the community in mind. Package management is therefore a first class feature.
Pro Multiplatform
Atom can run on Mac, Windows, and Linux.
Pro Extendable
Due to its modular design, almost any aspect of the editor can be changed. Even seemingly core packages, like those taking care of search and replace functionality, can be forked on GitHub, and changed and replaced in the editor.
The documentation for creating new plugins is also great, making it easier for developers to jump in and create plugins for Atom.
Pro Free and open source
Atom is free, open source, and written in C++, LESS, and CoffeeScript.
Pro Beginner friendly
One of the goals of Atom is to be a text editor for both experienced and beginner programmers. You can add keyboard shortcuts, change themes, install plugins, and change core settings by clicking through a GUI, or by manually editing config files the old-fashioned way. It has the added advantage of being built using the same engine that powers Google Chrome, so actions like opening and closing tabs feel familiar, even to new or non-programmers.
Pro Embedded Git control
Atom will highlight folders, files, and lines that have any uncommitted edits made. It also integrates really well with GitHub.
Pro Multi-line select and edit
Multiple cursors and column selection allow for versatile ways of editing.ctrl + d
will select the current word and each time the command is repeated, it adds the next occurrence of the word to the selection.ctrl + click
or middle-mouse click
will place another cursor in the place that's clicked. Cursors can then be controlled together. This also allows for selecting vertically.
Pro Command Palette support
The Command Palette permits fuzzy searching all available functions, settings, snippets, etc.
Pro Allows for instant file switching
By pressing Ctrl or Command + T and using fuzzy search, you can look for a file in your project.
Pro Themes
You can theme and customize Atom to your liking.
Pro Command line integration out of the box
Installing Atom adds two command line commands - atom
and apm
. The first one runs the application itself while the second is the Atom Package Manager that's used to add and remove various components from the package listing. While these features can be set up with other editors as well, Atom takes care of them out of the box.
Pro HiDPI support
Atom has built-in HiDPI support with zero scaling issues.
Pro Modern feel and very customizable and extendable
Pro Vim plugin turns Atom into a modernized vim
Pro Best support for Arduino with Platformio
Arduino is the most important platform for developing embedded systems.
Pro Could also be used as an IDE
Atom qualifies to be a good IDE because of the packages like linters, atom browser and hydrogen.
Cons
Con Not good for big projects
BlueJ is much better suited for small projects. It is designed to be simple and quite basic, rather than to handle large applications.
Con Lack of features
There are very few features available in BlueJ that would would expect from an IDE. For example, syntax highlighting is minimal and there is no code completion.
Con Good just for beginners
Not comfortable for expert programmers.
Con Uses its own "Java"-dialect
Con Very slow startup time
Atom is very slow to startup, which is a big disadvantage if you are accustomed to using it to make quick changes on your files.
Con High memory usage
Atom has a relatively high memory usage, especially when compared to some other text editors not based on Electron. For those who develop on the go, this also tends to mean shorter battery life.
Con Has difficulty with large text files
Tends to crash or hang with large >(10MB) text files, making it less useful as a general text editor.
Con Slows down exponentially with plugins
Extending it needs sacrificing responsiveness.
Con Not suitable for older computers
Atom requires a lot of system resources to run, so it will most probably be painfully slow on an older machine.
Con Doesn't handle RTL (right-to-left text) well
Text can't be highlighted and manipulated properly, cursor isn't displayed visually according to where it is logically (you have to type to find out), and similar issues.
Con Indent errors
Sometimes, especially when given a file that has different indentation that the current setting, the programm seems to get confused.
Con Not known when a new window will open
It's not really clear why and when a new window is opened when you open a file out of the tree view.
Con No text UI
Con Bloated - too many packages, too little productivity
Unable to use package to even convert a C file to PDF.
Con Slow because of Electron
Atom is not a native application. As such performance is subpar and the lag is especially noticeable on larger projects. It also opens a surprising amount of sub-processes and leaks a considerable amount of memory.
Con Crash and data loss
Repeated data loss when the app crashes.
A bugreport about that was closed automatically after some time, nobody cares.
Con Missing additional touches
As Atom is still relatively new, it's missing nice little touches that other text editors have implemented over the years. From simple ease-of-use items like middle-mouse button multi-cursor select, to the ways pasted information from a spreadsheet is interpreted in multi-select situations.