java runtime archive
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java runtime archive (jar) tutorial
a java archive (jar) file is a package file format used to aggregate multiple java class files and associated metadata into a single file. jar files are built on the zip file format and have a `.jar` file extension. they are commonly used for distributing java applications and libraries.
#### key features of jar files
1. *packaging:* allows bundling of many files into a single archive.
2. *versioning:* supports versioning of the classes and the jar itself.
3. *compression:* uses zip compression to reduce file size.
4. *manifest:* contains metadata about the jar file, including versioning and entry points.
5. *security:* supports digital signatures to verify the integrity and origin of the contents.
#### creating a jar file
to create a jar file, you will typically follow these steps:
1. *compile java code:* write and compile your java code into `.class` files.
2. *create manifest file (optional):* define the main class and other metadata.
3. *package the jar:* use the `jar` command to create the jar file.
step-by-step example
#### step 1: write java code
let's create a simple java application that contains a main class.
*helloworld.java*
#### step 2: compile the java code
open your terminal or command prompt and compile the java code:
this command generates a `helloworld.class` file in the same directory.
#### step 3: create a manifest file (optional)
if you want to specify a main class, create a manifest file named `manifest.mf` with the following content:
*manifest.mf*
make sure to include a newline at the end of the file, as it is required.
#### step 4: package the jar
use the `jar` command to package the `.class` file (and manifest if applicable) into a jar file:
`c`: create a new jar file.
`f`: specify the jar file name.
`m`: include the manifest file.
#### step 5: run the jar file
you can run your jar file using the `java -jar` command:
this should output:
...
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