Mention five features of BlueJ.

Five features of BlueJ are:

1. Simple beginner friendly graphical user interface.
2. It allows creating objects of the class dynamically, invoking their methods and also supplying data to the method arguments if present.
3. It supports syntax highlighting. (Syntax highlighting means showing the different tokens of the program like keywords, variables, separators, etc. in different colours so that they show up more clearly.)
4. It facilitates easier debugging as lines causing compilation errors are marked clearly and the error is displayed at the bottom of the window.
5. It provides a code editor, compiler and debugger integrated into a single tool.