Netbeans is a great open source Java IDE. For some reason it is missing from the current stable repository on debian. In order to get it installed as a regular desktop application in Debian Jessie (using GNOME) you should do the following:

1. JDK 8 is required in order to use netbeans. The default-jdkpackage on Jessie installs jdk7. First you must enable debian backportsand then you You can install it with sudo apt install -t jessie-backports openjdk-8-jdk
2. Download the latest version from the releases page. There are a couple different flavors. I usually choose the one that contains everything. This will download a bash installer script.
3. Open up a terminal and navigate to wherever you downloaded the script from Step 2. Execute the script with sh netbeans*.sh
4. This will run some pre-flight checks and then fire up an installation wizard that will guide you through the rest of the process.
5. Once Netbeans has been installed you can launch it by clicking on the icon that should now be on your desktop.