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File TypeJava Archive File

What is a JAR file?

A JAR file is a Java archive (JAR) file used by the Java Runtime Environment (JRE), a framework used for executing Java programs. JAR files may serve as program libraries or as standalone programs that run if the JRE is installed on the computer or mobile device.

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JAR files can contain .CLASS files, application resources, and an optional manifest file (META-INF/MANIFEST.MF). They are compressed using .ZIP compression and may optionally be digitally signed using the jarsigner tool included with the Java SDK. JAR files may be created with the jar tool, and they can be accessed using Java's java.util.jarAPI.

JAR files are used for some mobile games supported by Java-enabled mobile devices. They are also used by Mozilla Firefox, Thunderbird, SeaMonkey, and Sunbird to store themes and add-ons.

NOTE: The Java Runtime Environment is also referred to as the Java Virtual Machine (JVM). Sun Microsystems, the original developers of the JRE/JVM, were acquired by Oracle.

What is a JAR file?

The .jar file extension was developed by Sun Microsystems. Files with the .jar extension are compressed files that use the ZIP format in order to compress Java files. The files with the .jar extension contain Java classes and metadata. JAR files are often used by programs like Thunderbird, Firefox and SeaMonkey to store program add-ons and program themes.

JAR files can also be created to store files, much in the same way ZIP files are used. Files with the .jar extension can contain multiple files that have been compressed into a single folder or one large file that has been compressed to achieve a more manageable file size.

Software that will open, convert or fix JAR files

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About File Extension JAR

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File.org aims to be the go-to resource for file type- and related software information. We spend countless hours researching various file formats and software that can open, convert, create or otherwise work with those files.

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If you have additional information about the JAR file format or software that uses files with the JAR suffix, please do get in touch - we would love hearing from you.