Sometimes you find a good reference Java code, or an open source project you want to use, but the project is written as a NetBeans project. To use the project in Eclipse, follow the steps below.

Modify NetBeans project

First, you need to modify the NetBeans project file to suit in Eclipse. Open nbproject\project.properties.

Replace the following 2 lines

build.classes.dir=${build.dir}/classes
build.dir=build

with this

build.classes.dir=${build.dir}
build.dir=bin

Make Zip file

You may clean up the NetBeans project a little before this. Delete folders such as dist and build.
Then make a zip file that contains everything under the project folder, e.g. nbproject, src, and other folders and files necessary for the project to build.

Create an Eclipse Project

Create an empty Java project. When you create, select "Create separate source and output folders". Once the empty project is created, import the Zip file.