Modern Programming in Java

Table of Contents

• Functional Programming in Java
  • Program Structure
  • Imperative vs. Declarative Programming
  • Streams
• Reactive Programming in Java

Functional Programming in Java

Program Structure

Input data + Transformations + Output data = Algorithm

Imperative vs. Declarative Programming

• imperative programming: we tell the computer what we want and how it should be done, step by step

  • there's a lot of room for errors
  • verbose
  • understanding the algorithm is more difficult because of its complexity
  • when reading the code we have to go back and forth (e.g. when reading a loop)

• declarative programming: we tell the computer what we want but not how to do it

  • the algorithm resembles the problem statement
  • more concise
  • less room for errors
  • we understand what the algorithm does by reading it in one pass

Streams

• a List is like a bucket - it holds data
  • a List is a data structure
• a Stream is like a pipeline - it doesn't hold data, but it lets data flow through it
  • a Stream is not a data structure, it's an abstraction of the operations we apply to the data

Reactive Programming in Java

Coming soon...