Learn Java with BlueJ. BlueJ first appeared in 1999, named simply Blue. At that time, ... Greenfoot has been crafted as a “simple Java IDE and animation framework.” ...

BlueJ. BlueJ IDE was originally created in 1999 by John Rosenberg and Michael Kolling for educational purposes but has since caught on with Java developers around the globe.

For simple applications, it's an effective Java IDE. However, BlueJ's basic interface -- which only supports Java and the Java-like Stride language -- will likely make it unfit for complex Java ...

Sun Microsystems teams with a group of academics to release a version of the Sun NetBeans IDE that aims to help to train developers on Java and transition them to professional tools.