SE paradigms

Work in Progress

Concept

OOP

Is-A

inheritance
extends and implements

Has-A

composition
instance attributes
ownership

Can-Do

java class abstraction
interfaces and abstract methods

Java access modifiers

Classes

Modifier	Permissions
`public`	accessible to any other class
default	accessible within the same package

Attributes, methods and constructors

Modifier	Permissions
`public`	accessible to any other class
`private`	accessible only within the class
default	accessible within the same package
`protected`	accessible only within the same package and subclasses

Software development lifecycle(SDLC)

brownfield: builds upon existing software
greenfield: new software from scratch

Sequential model

linear process
specify requirements -> design -> implement -> test -> deploy

Iterative breadth-first

each iteration is a working product
all components are improved

Iterative depth-first

each iteration implements new functionality
iterations may not produce a working product

CI/CD

Continuous integration

integration, building and testing happens automatically after each code change

Continuous deployment

also deployed to end users