Not So Simple Java Calculator

Forked from mikailsheikh/cogitolearning-examples

This project is example calculator implementation with:

• Lexer - to split string expression into tokens
• Parser - to build AST from tokens sequence
• Abstract Syntax Tree - to represent string expression as tree
• Reverse Polish Notation - to calculate expression value

Design patterns

• Iterator
• Visitor
• Composite
• Singleton
• Records in Java 16
• Sealed Classes in Java 17
• Pattern Matching in Java 17 (preview)
• Guarded Pattern in Java 17 (preview)

Change added

• Maven
• JUnit5
• Lombok
• Decouple AST from calculation algorithm
• Reverse Polish Notation as calculation algorithm
• Fix code check style with Sonar, CodeMR, CheckStyle-IDEA and FindBugs-IDEA
• Migration to Java 8
• Migrate to Java 17