Layered Architecture

Each layer of the layered architecture pattern has a specific role and responsibility within the application.[1]

Back to the seminar

• How did your solutions look like?
• What if we wanted JSON or XML instead?

Open-Closed Principle

• Definition
  • Software entities should be open for extension, but closed for modification
• What does it mean?
• How to achieve that?

New stuff in Employee Records

• We have added a dozen commits since last week
• Let's explore them in greater details

N-tier architecture

Separation of concerns

Layers of isolation

Architecture sinkhole anti-pattern

Error Handling

• What is and Why we need error handling?
• Best practices
• Checked vs Unchecked exceptions
• Demo

Work with files

• Existing API
• Resource leaks
• try-with-resources

Comments in Java

• Documentation vs Implementation
• Best practices
• Demo