J File

What are J files and how to open them

Are you having problems opening a J file or just wondering what they contain? We explain what these files are used for and show you software that we know can open or otherwise handle your files.

What is a J file?

J files have multiple uses, and Java Source Code is one of them. Read more about the other uses further down the page.

Java Source Code File

Files that contain the .j file extension are most commonly used by the Java programming language. The J files that are used by this language contain the source code that has been written in Java.

These files may contain the code for an entire software application or may consist of a single file that is referenced by another Java programming project.

The J files that are associated with JAVA are usually saved with the .java file extension, but the .j file extension can be used in lieu of the standard .java suffix.

How to open J files

We have identified two J openers that are compatible with this specific type of J file.

Programs that open Java Source Code files

Last updated: February 24, 2023

All known file formats using extension .J

While Java Source Code File is a popular type of J-file, we know of 2 different uses of the .J file extension. Different software may use files with the same extension for different types of data.

JAR Compressed Archive

The .j file extension is also used for the archive files that are created with the JAR archiving software, which is a newer version of the once-popular ARJ archive software. Although named JAR, this tool has nothing to do with the JAR file type.

J opener for Windows

We have identified one J opener that is compatible with this specific type of J file.

Various apps that use files with this extension

These apps are known to open certain types of J files. Remember, different programs may use J files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about J file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.