What is a jar file in java

Introduction to jar files in java: (Recommended: java video tutorial)

1. JAR file is Java Archive File, as the name implies, Its application is closely related to Java, and it is a document format of Java.

2. A JAR file is very similar to a ZIP file - to be precise, it is a ZIP file, so it is called a file package.

3. The only difference between a JAR file and a ZIP file is that the content of the JAR file contains a META-INF/MANIFEST.MF file, which is automatically created when the JAR file is generated.

4. From the customer's perspective, the .jar file is a kind of encapsulation. They do not need to know how many .class files there are in the .jar file. The functions and functions of each file can also be obtained their desired outcome.

jar package: Common classes are usually referenced during development and packaged for easy storage and management.

war package: After making a web application, usually a website, it is packaged and deployed into a container.

ear package: Enterprise-level applications are usually EJB packaged into ear packages.

All packages are made with jar, but the extension of the target file is different

For more java knowledge, please pay attention to the java basic tutorial column.

The above is the detailed content of What is a jar file in java. For more information, please follow other related articles on the PHP Chinese website!