Decompile a Java project and compile

I am trying to decompile a java project(.jar) file and I am able to get .java files from it. Now how can I compile it back? I am able to add the .java files to Netbeans just as a single file.But how can I add it as a project add compile it? The project is a JavaFX project. So please help me on this.

There are many ways to achieve this, but I don't think you will be able to import the project inside the jar just out of the box ( in this case, out-of-the-jar ) like that.

We can use the most basic technique ( a bit dirty I admit ) but it works.

1. Extract the contents of the jar in a directory and decompile it like you done it before
2. Next, make an empty project inside netbeans ( with no src directory or anything )
3. Copy the contents of your decompiled project into this netbeans folder. You should now see a skeleton structure of some files. Note The poject is inisde netbeans but it is not a java project yet.
4. Edit the classpath of the netbeans project and add java library to make it into a Java netbeans project.

The other technique that I use sometimes is that I make all the project files required by the IDE (Eclipse in my case) manually and then tell eclipse to import the project. When eclipse finds all the required files ( .project, .classpath and all ), it imports into the IDE just fine