Nội dung kiến thức:
	- Chữa bài tập
	- Overview OOP
		- T/c đóng gói
		- T/c kế thừa
			- override
			- overloading
		- T/c đa hình
		- T/c trừu tượng

		- Tìm hiểu interface
		- Test nhanh:
			- Kiểm tra lại toàn bộ OOP (basic)
			- Logic cở bản
=====================================================================
Bài toán:
- Citizen:
	Thuộc tính:
		name
	Phương thức:
		running()
- Student
	Phương thức:
		running()
- Dog:
	Phương thúc:	
		running()
- Car:
	Phương thức:
		running()
Yêu cầu:
Tạo 1 mảng -> quản ly đc tất cả các đối tượng: Citizen, Student, Dog, Car trong 1 mang
Mục đích -> Xử lý gọi function running() của tất cả đối tương cho dễ.

Code như thế nào???

Giải pháp:
	???

#Car.java

/*
 * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
 * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
 */
package com.gokisoft.c2209i.lesson04;

/**
 *
 * @author teacher
 */
public class Car implements IRunning{

    @Override
    public void running() {
        System.out.println("Car is running");
    }
    
}

#Citizen.java

/*
 * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
 * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
 */
package com.gokisoft.c2209i.lesson04;

/**
 *
 * @author teacher
 */
public class Citizen implements IRunning{
    String name;

    public Citizen() {
    }

    public Citizen(String name) {
        this.name = name;
    }
    
    @Override
    public void running() {
        System.out.println("Citizen is running");
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
    
    
}

#Dog.java

/*
 * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
 * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
 */
package com.gokisoft.c2209i.lesson04;

/**
 *
 * @author teacher
 */
public class Dog implements IRunning{

    @Override
    public void running() {
        System.out.println("Dog is running");
    }
    
}

#IRunning.java

/*
 * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
 * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Interface.java to edit this template
 */
package com.gokisoft.c2209i.lesson04;

/**
 *
 * @author teacher
 */
public interface IRunning {
    //public void running()
    void running();
}

#Main.java

/*
 * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
 * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
 */
package com.gokisoft.c2209i.lesson04;

import java.util.ArrayList;
import java.util.List;

/**
 *
 * @author teacher
 */
public class Main {
    public static void main(String[] args) {
        List<IRunning> dataList = new ArrayList<>();
        Citizen c = new Citizen();
        dataList.add(c);
        
        Student std = new Student();
        dataList.add(std);
        
        Dog d = new Dog();
        dataList.add(d);
        
        Car car = new Car();
        dataList.add(car);
        
        for (IRunning run : dataList) {
            run.running();
        }
    }
}

#Student.java

/*
 * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
 * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
 */
package com.gokisoft.c2209i.lesson04;

/**
 *
 * @author teacher
 */
public class Student extends Citizen{

    @Override
    public void running() {
        System.out.println("Student is running");
    }
    
}