.j
| File Type 1 |
 Java Source File |
| File Format |
Standard (developed by Oracle) |
| Usage |
Open manually; may be referenced by an application |
| Rank |
★ ☆ ☆ Uncommon |
| Description |
Contains program source code written in the Java programming language; may include the source code for a complete program or may be one of many files referenced by a Java programming project.
Java source files most often have a .JAVA extension.
|
| Open With |
| Windows |
 Oracle Java Virtual Machine
 Eclipse IDE for Java Developers
 gVim
|
| macOS |
Oracle Java Virtual Machine Eclipse IDE for Java Developers |
| Unix |
Oracle Java Virtual Machine Eclipse IDE for Java Developers  javac
|
|
| Updated |
2007 |
| File Type 2 |
JAR Archive |
| Rank |
★ ☆ ☆ Uncommon |
| Description |
Compressed file archive created with JAR, the successor to the ARJ file compression program (which created .ARJ files); JAR is available in a 16-bit DOS version and a 32-bit Windows version.
Not related to the .JAR format, which is a Java Archive.
|
| Open With |
| Windows |
ARJ Software JAR
|
|
| Updated |
2007 |
| File Type 3 |
JPEG Image |
| File Format |
Standard |
| Usage |
Open manually |
| Rank |
★ ☆ ☆ Uncommon |
| Description |
Compressed graphic that uses .JPEG image compression; may contain thousands of colors, which makes it a good format for storing digital photos; can use different levels of compression, but the more compression is used, the lower the quality of the resulting image.
Most JPEG files have a .JPG extension.
|
| Open With |
| Windows |
Any picture viewer
Any Web browser
|
| macOS |
Any picture viewer Any Web browser |
|
| Updated |
2007 |
|
