Files with j file extension can be mainly found as Java source codes.

There are 2 other file types using
the J file extension!

j icon.j - JPEG/JFIF image

empty icon.j - JAR archive

Detailed description

Software that open j file

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J file extension - Java source code

What is j file? How to open j files?

File type specification:

Source code and script file type icon Source code and script file type

The j file extension is associated with the Java, a programming language and framework, available for various platforms and systems.

The j files contain source code written in Java language.

Updated: June 16, 2024

The default software associated to open j file:

Java Development Kit (JDK) icon

Oracle Corporation logoJava Development Kit (JDK)  Multiplatform software

Company or developer:
Oracle Corporation

 JDK is a development environment for building applications, applets, and components using the Java programming language.

Help how to open:

You can view or edit these files in any text editor.

How to convert:

As far as we know, this .j file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.

Find conversions from j file:

j to t

List of software applications associated to the .j file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open j file, edit j file, convert j file, view j file, play j file etc. (if exist software for corresponding action in's database).

Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting j files.

Software that open j file - Java source code

Programs supporting the exension j on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about listed programs for open j file action.

Microsoft Windows:

Apple macOS / Mac OS X:


Main software associated with j file by default:
Java Development Kit (JDK) small icon Java Development Kit (JDK)
Other suggested software:
Visual Studio Code small icon Visual Studio Code

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