在jar中更新类，指定目录？

Question

I want to update a .class file in a jar. The .class file is in a folder in the jar. If I want to update it, do I need to specify the specific pathname where it's located?

Do I do:
jar uf myJar.jar myFolder/myClass.class

or just:
jar uf myJar.jar myClass.class

If I don't specify path, will it automatically find the .class and replace it? Or are jars allowed to have the same .class names within different directories?

Answer 1

You need to be explicit. It's perfectly valid to have different classes with the same name in different packages. eg

com.example.package.A
com.example.package.subpackage.A

etc...

Answer 2

You need to provide the full path name to update the jar file

jar uf myJar.jar myFolder/myClass.class

And you can have same class files in different directories

Answer 3

jar uf jar-file input - >因为你想要更新已经存在的文件，你必须指定文件夹结构。