File Extension Search

.j File Extension

Developer: Oracle
File type: Java Source File
You're here because you have a file that has a file extension ending in .j. Files with the file extension .j can only be launched by certain applications. It's possible that .j files are data files rather than documents or media, which means they're not meant to be viewed at all.

what is a .j file?

A Java source file contains source code associated to an application developed with the Java programming language, and the corresponding Java source files are referenced by a Java application when a user requests for a set of features requiring data contained in the Java source file. The content of a Java source file may include directory locations of other program files needed by the associated application to provide the user with the set of features corresponding to certain functionalities requested by the user from the application. These Java source files are integrated with encoding standards used by Oracle for the J file format. Specific compilation specifications proprietary to Oracle are also implemented into a Java source file. Files appended with the .j extension are Java source files developed with multi-platform compatibility support, much like the larger Java program associated to the Java source file. A Java application developed with a J source file can be opened and simulated using the Oracle Java Virtual Machine software. This program has versions developed for computers running on Microsoft Windows-based systems, while another version is intended for Mac platforms. Linux users can also create, open and simulate certain functionalities entered by an author of a Java program with a J file using the Oracle Java Virtual Machine version for Linux platforms.

how to open a .j file?

Launch a .j file, or any other file on your PC, by double-clicking it. If your file associations are set up correctly, the application that's meant to open your .j file will open it. It's possible you may need to download or purchase the correct application. It's also possible that you have the correct application on your PC, but .j files aren't yet associated with it. In this case, when you try to open a .j file, you can tell Windows which application is the correct one for that file. From then on, opening a  .j file will open the correct application. Click here to fix .j file association errors

applications that open a .j file

Oracle Java Runtime Environment

Oracle Java Runtime Environment

The Java Runtime Environment was developed by Oracle and this is a very useful application today as most of the programs offline and online use Java technology. This application is used on most operating systems to allow users to run applications that require Java whether they are Java plug-ins or Java Web start. This application belongs to the Java Development Kit, wherein it is known as a set of tools that is used for Java application development. The Java Runtime Environment also features a Java virtual machine and this is the feature that enables Java applications to run on a certain operating system. This virtual machine makes up an ideal environment for creating applications with Java. It contributes a lot to convenience for users when it comes to opening Java applications. This software is available in different languages as well as runs on Windows, Linux and MAC operating systems. Also, this is one of the applications used to open JAR files which stand for Java Archive Files.


gVim is a free, open-source, highly configurable, feature-rich portable text editing software for programmers. It is known as the “programmer’s editor”. You can write codes efficiently with syntax highlighting in various languages, and has features such as search and replace for regular expressions. It has pop-out menus for easy access with a layered interface to enable you to work on multiple documents. gVim is the improved version of vi editor that is run on most Unix systems. It is bundled with another version of gVim to work in a Notepad-like manner called Easy Vim or evim or gVim Easy. It runs on Windows Vista, Windows 7, Windows 8, Windows 2000 and Windows XP. The latest version is version 7.3 with changes such as text concealment, Lua interface, blowfish encryption, swap file encryption, undo for reload, persistent undo and Python 3 interface.
Eclipse IDE for Java Developers for Linux

Eclipse IDE for Java Developers for Linux

Eclipse Integrated Development Environment is a program which is uses for developing Java applications. This software allows the user to have a tool for editing Java with incremental compilation, validation, code assist, cross referencing, editor for XML, application life cycle framework for Eclipse which Mylyn and many more. The user may need the Java Runtime Environment (JRE) to work with Eclipse IDE. There are additional features which will install through update manager such as Ruby development tool kit (DLTK), Java EE Tool for Web (WTP), Reporting Tools (BIRT), Data Tools (DTP) and the Test and Performance Tools (TPTP). This software also has debugging support with hyperlink stepping, Quick Access for the enhancement of Integrated Development Environment. There is also a Quick Fix support as well as additional refactoring. This software runs with Microsoft, Mac , and other Linux Distributions. And for the hardware components, at least 1 GB RAM (2 GB would highly be recommended).
Microsoft Notepad

Microsoft Notepad

Notepad is a basic text editor used to create plain documents. It is commonly used to view or edit text (.txt) files, and a simple tool for creating Web pages, and supports only the basic formatting in HTML documents. It also has a simple built-in logging function. Each time a file that initializes with .log is opened, the program inserts a text timestamp on the last line of the file. It accepts text from the Windows clipboard. This is helpful in stripping embedded font type and style codes from formatted text, such as when copying text from a Web page and pasting into an email message or other “What You See Is What You Get” text editor. The formatted text is temporarily pasted into Notepad, and then immediately copied again in stripped format to be pasted into the other program. Simple text editors like Notepad may be utilized to change text with markup, such as HTML. Early versions of Notepad offered only the most basic functions, such as finding text. Newer versions of Windows include an updated version of Notepad with a search and replace function (Ctrl + H), as well as Ctrl + F for search and similar keyboard shortcuts. It makes use of a built-in window class named edit. In older versions such as Windows 95, Windows 98, Windows Me and Windows 3.1, there is a 64k limit on the size of the file being edited, an operating system limit of the EDIT class.
Microsoft WordPad

Microsoft WordPad

Files with .rtf, .openbsd, and .readme extensions are some of the files associated or which can be opened with the Microsoft WordPad. RTF files are text documents that can be created, opened, viewed, edited or changed using word processing applications for both Mac and Microsoft Windows-based computers, like Microsoft WordPad for Windows and Microsoft Word 2011 for Mac. It gives the users a wide cross compatibility support, which was the central objective for the improvement of the Rich Text Format technology, and these .rtf files can even be opened, viewed and used with database applications. The OpenBSD Unix platform is frequently utilized in computers running as Web servers of a secure network. OpenBSD files may be saved in directories of the OpenBSD system that were generated upon installation of the software applications. Files with the .openbsd extension can be opened by standard text editors, particularly well-known like Microsoft Notepad, and this text editor may also be utilized to create and edit OPENBSD files. Files with the .readme extension are text documents engaged to give users with beneficial information and specific details about certain applications installed in the system. These files can be opened, viewed and edited with a selection of text editors including Microsoft Notepad and Microsoft WordPad.

a word of warning

Be careful not to rename the extension on .j files, or any other files. This will not change the file type. Only special conversion software can change a file from one file type to another.

what is a file extension?

A file extension is the set of three or four characters at the end of a filename; in this case, .j. File extensions tell you what type of file it is, and tell Windows what programs can open it. Windows often associates a default program to each file extension, so that when you double-click the file, the program launches automatically. When that program is no longer on your PC, you can sometimes get an error when you try to open the associated file.

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