ProfessorJ language levels

A non-exhaustive list of Java features present at each level in ProfessorJ. Higher levels include everything at lower levels. Errors, comments, etc to me at dblaheta at knox.edu

Beginner:

• basic constructors
• abstract classes
• ...cannot have constructors
• subclassing
• super constructor
• if-else with single statements
• instantiating objects
• enforced "this." for instance variables and methods
• method bodies are only a return and maybe if-else
• importing classes
• arithmetic and mathematic relations (< > == etc.)
• ...including bitwise operators (^ & |) (this may change)
• ...but == and != are not allowed on floating point values
• boolean operators (&& || !)

Intermediate:

• interfaces ("interface", "implements", etc)
• == and != are allowed on floating point values
• casting
• void return types
• expression statements (i.e. side-effect-only expressions)
• blocks (sequences of statements)
• any statements allowed in constructor
• init'ing in field declaration
• named values in code (not just in interactions)

Advanced:

• packages
• access control (pub classes, pub/prot/priv members)
• bare code blocks in class defs (for init'ing classes?) (should be static; likely to change)
• final methods (can't be overridden)
• static methods, fields
• optional else clause
• iterative loops (while, do-while, for, break, continue)
• overloading
• ++, --
• arrays (incl init'ing)
• instanceof
• ?:

Full (not yet fully implemented):

• += et al
• private classes
• exceptions
• inner classes