Tag: oop

All the articles with the tag "oop".

• Java Study #2 — Collections (List / Map / Set) · Stream Pipelines · Null-Safe Handling with Optional

  6 Jul, 2026

  Week 2 of studying Java. I go through the core of the Collection Framework — List (ArrayList), Map (HashMap), Set — and notice the 'interface and implementation' pattern in each of them (List<String> books = new ArrayList<>()). Then I move on to Stream, building filter → map → collect pipelines without for loops, method references (System.out::println), and combining groupingBy + counting. Finally, Optional — I learn to always handle the absence-of-value case with ifPresent / orElse / map instead of calling get() right away.

• Java Study #1 — First Java Run · Syntax Overview · OOP Basics (Classes · Encapsulation · Inheritance · Interfaces)

  3 Jul, 2026

  Starting Java study to fill in my lacking backend and production experience. In one day, I went from installing Java to covering the switch statement's -> arrow syntax, for-each, the need for double casting in integer division, the public class file rule, encapsulation with private + getter, the difference with and without static, the @Override annotation, and connecting interfaces with implements. Having Python / C++ experience, many concepts were already familiar.