BlueJ vs Eclipse

5
BlueJ
A free Java Development Environment designed for beginners, used by millions worldwide. BlueJ has a deliberately smaller and simpler interface than professional environments like NetBeans or Eclipse. This allows beginners to get started more quickly, and without being overwhelmed.
16
Eclipse
Eclipse is probably best known as a Java IDE, but it is more: it is an IDE framework, a tools framework, an open source project, a community, an eco-system, and a foundation.