Depends on what you mean by "work". For one thing, a jar is a Java archive file, not a folder.
you have to convert the .jar files to .jad from your computer. jadmaker for windows is good. personally i use jar2jadd on my LG Rumor touch but jadmaker works just as well. after that you put both the .jar and jad files into the APPS folder on your micro SD card. after that go to My Stuff on the phone, go all the way to the bottom and there should be a folder named Apps. go to it and install the files.
Generally you add the jar to the Libraries folder of the project in the IDE - In Netbeans, simply right click on Libraries folder and select Add Jar/folder
Install bukkit
You have to open it with winrar.
When you open the .jar, you're then in the root, meaning the top 'level' which contains all the other folders and files.
download it then chuck its contents in a mods folder in minecraft .jar
If you are using window's, then use the Run program, and type in %appdata% and then run that, and it will bring you to a file containing the .minecraft folder.
when you extract the folder look in it to see if it has an info.txt docuent. if it does then save it in the addons folder if it doesnt then save it in the garrys mod folder
You dont put them in your texture pack folder, hence the name "texture pack folder". You need to get a program such as 7ZIP or WINRAR and extract both the mod folder and MC jar. Drag ALL mod files in the MC Jar and delete "Meta-Inf"
it doesnt let anything in it
in eclipse ide,.war,.jar files are kept inside lib folder
You download the mod and open it with a archiving program, Win-rar is what I use but there is also 7-zip, then you have to find your .minecraft folder. You can find it by searching %appdata% in your start menu. Open the .minecraft folder then open the bin folder. Inside the bin folder, there is the .jar. Open it with a archiving program. Look at the mod. If there is a Readme file, open it and follow what it says to do. Also, there is usually the instructions on the page that you found the mod. If there isn't a Readme folder, then open the mod with the archiving program and copy all of the .classes into the .jar or your .minecraft folder. Caution: If you get a black screen when opening minecraft after installing the mod, then it is because you didn't delete the META-INF folder in your minecraft jar. Hope this was helpful. Ask me if there is any other problems. -Aiya