LanguageJ
Java source code
File type: Source code and script file
Files with j file extension can be mainly found as Java source codes.
Found 3 different file type records with the same j filename suffix.
What is j file?
File type category:
Source code and script file
Date updated: December 31, 2024
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.
How to open j file?
You can view or edit these files in any text editor.
Suggested software to open j file:
Associated software actions with the j file
Software applications that can open j files:
Sublime Text (Microsoft Windows)
Sublime Text for Mac (Apple macOS / Mac OS X)
Sublime Text for Linux (Linux/Unix)
Java Development Kit (JDK) (Multiplatform)
Visual Studio Code (Multiplatform)
Software applications that can edit j files:
Sublime Text (Microsoft Windows)
Sublime Text for Mac (Apple macOS / Mac OS X)
Sublime Text for Linux (Linux/Unix)
Java Development Kit (JDK) (Multiplatform)
Visual Studio Code (Multiplatform)
Software capable of saving j files:
Sublime Text (Microsoft Windows)
Sublime Text for Mac (Apple macOS / Mac OS X)
Sublime Text for Linux (Linux/Unix)
Java Development Kit (JDK) (Multiplatform)
Visual Studio Code (Multiplatform)
Software apps that create j files:
Java Development Kit (JDK) (Multiplatform)
Visual Studio Code (Multiplatform)
Software applications that handle other tasks involving j files:
Java (Multiplatform)
JAR archive
File type category:
Archive and compressed file
Date updated: May 27, 2019
The j file extension is also related to Java and used by JAR compression software for its default archive format, developed by ARJ Software. Not to be confused with Java JAR.
How to open j file?
You can decompress these files using JAR program.
How to convert j file?
Probably cannot be converted to anything else.
Suggested software to open j file:
Associated software actions with the j file
Software applications that can open j files:
JAR (Microsoft Windows)
Software apps that create j files:
JAR (Microsoft Windows)
Software apps that extract j files:
JAR (Microsoft Windows)
JPEG/JFIF image
File type category:
Bitmap image file
Date updated: June 23, 2025
The j file extension is also occasionally used for standard JPEG images., specially those in the JPEG File Interchange Format.
JFIF is an image file format standard. It is a format for exchanging JPEG encoded files compliant with the JPEG Interchange Format (JIF) standard. It solves some of JIF's limitations in regard to simple JPEG encoded file interchange. As with all JIF compliant files, image data in JFIF files is compressed using the techniques in the JPEG standard, hence JFIF is sometimes referred to as "JPEG/JFIF".
For more information see: jpg file extension record in our database.
How to open j file?
Rename file to *.jpg and use any common image viewer.
How to convert j file?
See conversions from *.jpg to any other graphics formats.
Suggested software to open j file:
Associated software actions with the j file
Programs for viewing j files:
XnView MP (Multiplatform)
Software apps that print j files:
XnView MP (Multiplatform)