How to Run .JAR Java Archive Files
Updated: February 2026
The .JAR file format (Java Archive) is a package file format combining multiple Java class files, resources, and metadata into a single compressed archive. JAR files distribute Java applications and libraries efficiently.
Running JAR Files
Method 1 - Double-click: If Java Runtime Environment (JRE) is installed and JAR is executable, double-clicking launches it.
Method 2 - Command line:
Run
java -jar filename.jar
in terminal/command prompt.
Method 3 - Specify main class:
java -cp filename.jar com.package.MainClass
Installing Java Runtime
Download free Java from java.com or adopt OpenJDK. JAR files require JRE (Java Runtime Environment) to execute. Verify installation with
java -version
command.
Extracting JAR Contents
JAR files are ZIP archives. Extract with 7-Zip, WinRAR, or
jar xf filename.jar
command. Inside you'll find .class files, resources, and manifest file.
Creating JAR Files
Use
jar cvf myapp.jar *.class
command or IDE features (Eclipse, IntelliJ) to package CLASS files into JAR archives. Include manifest file specifying main class for executable JARs.
Related guides: Dll File What Is How To Fix , Pdf File Opener Free Tools , Requirements Txt Python Dependencies , Mp4 Mkv Avi Video Player Free , Sh File How To Run Linux Mac
Related guides: Zip Rar 7Z File Extractor Free , Csv File How To Open Edit , Apk File Android How To Open Install , Docx File How To Open Without Word , Exe File What Is How To Open
Related guides: Composer Json Php Dependencies , Ini File Configuration How To Edit , Package Json Nodejs Dependencies , Env File Environment Variables , Zip File How To Open Extract
Frequently Asked Questions about How to Run .JAR Java Archive Files
Is How to Run .JAR Java Archive Files suitable for beginners?
Yes, absolutely. Our guide to How to Run .JAR Java Archive Files explains all basics clearly.
How much does How to Run .JAR Java Archive Files cost?
Costs vary depending on the provider. A comparison is always worth it.
Where can I find more information?
Right here in our expert area for file-extensions-guide.