Motivation:

always, if you wanna check/analyze source code or do some contribution in open source communities, you would like to download the source code of some projects and load (or import) it into your own IDE. (if you don't wanna use CVS or SVN)

Following is my favorite way to do that under Eclipse:

1. create a new blank Java project:

File -> New -> Project ... -> Java Project --> Next >> -> input the project name (project layout: Create seperate source and output folders) --> click Finish

2. right click Source Folder "src" --> import ... -> select File system -> choose correct source code folder where you put the downloaded source code by click the top "Browse..." button (source code folder means the root folder  thus can keep folder structure as package structure) --> Finish

3. if you import wrong source code folder, you can delete whole project to redo. (it is no use merely deleting some failed packages)

Note:

if there is Ant build file (some stuff like build.xml) included in source code package, that will be cool, just using File -> New -> Project... -> Java Project from Existing Ant Buildfile.