Jar Opener

Jar Opener is a utility with a name that pretty much describes its functionality - it allows you to identify the elements included in a JAR file. Its features are easy to figure out.
Since this is a JAR file, there is no installation package available. In other words, you can simply drop Jar Opener on the hard drive and directly run it on any computer that has Java installed.
The app's interface is represented by a familiar window with a clean layout. Loading a JAR item into the workspace can be done by using either the file browser or the "drag and drop" functionality.
So, you can find out the author, manifest version, main class and version of the JAR file, along with containing files, such as metadata information and classes.
On top of that, you can toggle the viewing mode between flat packages, hierarchical packages and file details; the latter option lets you view the size, compressed size and last date of modification for each file.
The straightforward software tool runs on a moderate amount of CPU and system memory, has a good response time and includes a brief help file. We have not come across any problems during our testing; Jar Opener did not hang, crash or display error notifications. Although no recent updates have been made, Jar Opener should please all users who want to get to know information on their JAR files.