This tutorial task prepares you for an upcoming tP task. So, do not skip it.
Relevant textbook topic:
Textbook Tools → IntelliJ IDEA → Debugging: Basic
If you are new to debugging with an IDE, we recommend you have a look at [guide@se-edu] Intellij IDEA: Using the debugger.
Explain Sequence Diagram about Machine
Explain Sequence Diagram (ParserFactory)
ParserFactory