Open J files with File Viewer Plus

J file open in File Viewer Plus 3
A Java Source Code File open in File Viewer Plus 3

Do you need to open a Java source code (.J) file?

File Viewer Plus can open J files! It includes helpful viewing options, such as a syntax tree view for navigating the source code. The program can also edit the source code and save the J file.

Open, edit, and save J files with our easy-to-use program. Try File Viewer Plus today!

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Free 14-day trial. 86MB

What is a .J file?

j file icon

J files store program source code written in the Java programming language. They are compiled into CLASS files, which make up an application. Java may be used to develop a variety of applications, including web apps and desktop programs that can run on multiple platforms using the Java Virtual Machine included with the free Java Runtime Environment. A J file may be one of many source files referenced within a project or it may include all the source code for a program.

If you are an app developer, you may have worked with J files, or JAVA files, which are more commonly used to store Java source code. File Viewer Plus comes with various features for navigating the source code, such as a syntax tree view, word wrap, code folding, ruler, and line numbers. After editing the source code you can save the J files to preserve the changes.

Learn more about J files at

File Viewer Plus J Support

Batch Convert

Conversion options:
RTF, Plain text

About File Viewer Plus

File Viewer Plus is a universal file viewer for Windows. Why pay for many software programs and clutter your PC when you only need one? File Viewer Plus supports over 300 file types. No longer do you need to buy extra software or install shady programs to open unknown or unique file types. File Viewer Plus also enables you to edit, save, print, and quickly convert your files.

Start your 14-day fully-featured trial today.