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Editorial Team
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Asked: 2026-05-26T08:47:10+00:00

I have a web program where I want the user to be able to

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I have a web program where I want the user to be able to import a .war file and I can extract certain files out of the .war file. I have found two class libraries: java.util.zip.* and java.util.jar.*. From what I understand, a WAR file is a special JAR file which is a special ZIP file. So would it be better to use java.util.jar? If ZIP and JAR files are pretty much the same why is there a need for two different libraries?

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1 Answer

  1. Editorial Team

    If you look at the JarFile API you’ll see that it’s a subclass of the ZipFile class.

    The jar-specific classes mostly just add jar-specific functionality, like direct support for manifest file attributes and so on.

    It’s OOP “in action”; since jar files are zip files, the jar classes can use zip functionality and provide additional utility.

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