BlueJ

BlueJ is a free Java Development Environment designed for beginners to develop Java programs quickly and easily.

Its main features are that it is:

• Simple: 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.
• Designed for teaching: BlueJ is deliberately designed with good pedagogy in mind. There is a popular textbook designed for teaching introductory university/college courses with BlueJ, and a site full of teaching resources.
• Interactive: BlueJ allows you to interact with objects. You can inspect their value, call methods on them, pass them as parameters and more. You can also directly invoke Java expressions without compiling.
• Portable: BlueJ runs on Windows, Mac OS X, Linux and other platforms which run Java. It can also run without installation from a USB stick.
• Mature: BlueJ is over fifteen years old, but continues to be updated and supported by a full-time team.

Check out BlueJ here.

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