How can I edit a .jar file? [duplicate]

So I have a jar file with one .class file on it. I just need to change some words in the file. What program should I use?

I want this to work for my phone.

How do you decompile a JAR and edit it?

Before opening jar file just change the extension of jar to zip file and then extract that particular class file that you want to edit , then decompile it using any decompiler ,make the changes , compile it back and then finally put it back in the zip file. Hope it helps.

How do I open a jar file with edit code?

A jar file is a zip archive. You can extract it using 7zip (a great simple tool to open archives). You can also change its extension to zip and use whatever to unzip the file.

Here's what I did: