About Me

Teaching paradigm

Learn It => Master It => Apply It

知识不是力量，

只有能被我们支配和利用的知识才是力量

OOPS

Stands for Object-Oriented Programming Style
The most used programming paradigm
Treat everything as object that can interact with each other

Class vs object

Class

A blueprint, a description, an idea that we use to create object
A class defines fields (a.k.a. attributes or properties) and behaviors (methods)

Object

We create object based on class
We can create multiple objects based on one class

CREATE AIRPLANE

Fields (a.k.a. attributes or properties):

Weight
Color
Airline
...

Behaviors (a.k.a. methods):

Take off
Land
...

DEFINE AIRPLANE class

public class Airplane {

    // Fields (a.k.a. attributes or properties)
    String color;
    String airline;
    
    // Constructor (instruction for instantiating an airplane object)
    public Airplane(String color, String airline) {
    	this.color = color;
        this.airline = airline;
    }
    
    // Behaviors (a.k.a. methods)
    public void takeOff() {
    	...
    }
    
    public void land() {
    	...
    }
}

INSTANTIATE AIRPLANE object

// Instantiate airplane objects based on Airplane class
Airplane myAirplane = new Airplane("blue", "China Southern Airline");
Airplane urAirplane = new Airplane("yellow", "American Airline");

// Use airplane behaviors (methods)
myAirplane.takeOff();
urAirplane.land();

LET'S try CREATEing human

Fields (a.k.a. attributes or properties)

Behaviors (a.k.a. methods)

in THE WILD (real world)

in THE WILD (VIRTUAL WORLD)