☕Java

코드잇 Bootcamp start 5.22.25 Related: 🐣Spring & SpringBoot

Overview 🥪

• JVM, JRE, JDK Explained
• Garbage collection (GC)
• Hello World - Java

Data Types and Variables

• Literals
• Primitive vs Reference types
• Type Conversion in Java
• Unary Operators (단항 연산자)
• Data type operations & ranking
• Arrays in Java
• Immutable Objects

Basic Syntax & Info

• Short circuit evaluation
• Switch statements in Java
• == and .equals
  • ==
    • checks if two variables point to the same object in memory
    • safe with enums because enums are constants
  • .equals
    • Compares the contents, not memory location
• Java packaging
• Java Modifiers
  • Access modifiers (접근 제어자)
  • Non-Access modifiers (기타 제어자)
    • Final

Java Classes/Utilities

• String class
• Math class
• Scanner
• Wrapper class
• Java enum

OOP

Classes

• Classes & Instances
  • Classes & Instances
  • Fields
  • Methods
• Class vs Instance variables
• Local VS Class VS Instance variables
• Class vs Instance methods
• Constructor & this

4 Fundamentals in OOP

• Inheritance in java
  • Composition
• Encapsulation
  • Immutable Objects
• Polymorphism in java
  • Method overloading
  • Method overriding
• Abstraction - Classes & Interfaces

Design Principles

• SOLID
  • Notion 링크
  • SRP(Single Responsibility Principle)
  • OCP (Open Closed Principle)
  • LSP (Liskov’s Substitution Principle)
  • ISP (Interface Segregation Principle)
    • 자바내부코드, spring 안들 보면 됨
    • in memory 저장 → repository
  • DIP (Dependency Inversion Principle)

Java Collection Framework(JCF)

Literally just a java version of data structures 🍟

• Java Collections Framework (JCF)

Advanced Java Concepts

• Java Generics
• Java exception handling
• Java Annotation
• Java File IO
  • Java Serialization (and persistence)
• Thread

Functional Programming in Java

• Lambda
• Functional Interfaces & Descriptor
• Method Reference
• Stream in Java

Design Patterns

• Factory design pattern