https://meet.google.com/xji-euky-fid

Nội dung kiến thức:
- Exception
	- Logic: chia 0 (5/0 -> Error -> Exception), int arr[] = new int[3] -> arr[4], arr[5] -> error -> Exception =)), NullPointerException
		Student std = null;
	- Runtime
	- ...

- Package
- Collections
	- List (ArrayList, Vector)
	- Map (HashMap)
	- Set
====================================================
Ví dụ:
	- Class Animal: name, age, gender (Male/Female)
	-> age < 0 => AgeException (msg: Age >= 0)
	-> gender != Male/Female -> GenderException (msg: Gender is not correct)
	-> OK -> Init object success

Bai toan:
	Animal
		gender: Male & Female

	Light:
		status: 1 -> SANG, 0 -> TAT => int

#AgeException.java

/*
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 * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
 */
package java2.lesson01;

/**
 *
 * @author diepvan
 */
public class AgeException extends Exception{

    public AgeException(String message) {
        super(message);
    }
}

#Animal.java

/*
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 * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
 */
package java2.lesson01;

/**
 *
 * @author diepvan
 */
public class Animal {
    public static final String GENDER_MALE = "Male";
    public static final String GENDER_FEMALE = "Female";
    
    enum GENDER {MALE, FEMALE};
    
    String name;
    int age;
    String gender; //Male & Female
    
    GENDER mGender;

    public Animal(String name, int age, String gender) throws AgeException, GenderException {
        this.name = name;
        setAge(age);
        setGender(gender);
        
        mGender = GENDER.MALE;
        
        System.out.println("Init object success");
    }

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

    public void setAge(int age) throws AgeException {
        if(age < 0) {
            throw new AgeException("Required: Age >= 0");
        }
        this.age = age;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) throws GenderException {
        if(!gender.equals("Male") && !gender.equals("Female")) {
            throw new GenderException("Gender is not correct");
        }
        
        this.gender = gender;
    }
    
    
}

#GenderException.java

/*
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 * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
 */
package java2.lesson01;

/**
 *
 * @author diepvan
 */
public class GenderException extends Exception{

    public GenderException(String message) {
        super(message);
    }
    
}

#Light.java

/*
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 * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
 */
package java2.lesson01;

/**
 *
 * @author diepvan
 */
public class Light {
    enum STATUS {ON, OFF};
    //status: 1 -> ON, 0 -> OFF
    STATUS status;
}

#Main.java

/*
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 * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
 */
package java2.lesson01;

import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author diepvan
 */
public class Main {

    public static void main(String[] args) {
//        test01();
        test02();
    }

    static void test02() {
        Animal animal;
        
        try {
            animal = new Animal("ABC", -10, "Male");
        } catch (AgeException ex) {
            System.out.println(ex.getMessage());
        } catch (GenderException ex) {
            System.out.println(ex.getMessage());
        }
        try {
            animal = new Animal("ABC", 2, "AAA");
        } catch (AgeException ex) {
            System.out.println(ex.getMessage());
        } catch (GenderException ex) {
            System.out.println(ex.getMessage());
        }
        try {
            animal = new Animal("ABC", 5, "Male");
        } catch (AgeException ex) {
            System.out.println(ex.getMessage());
        } catch (GenderException ex) {
            System.out.println(ex.getMessage());
        }
    }

    static void test01() {
        Scanner scan = new Scanner(System.in);

        int x, y;

        System.out.println("Nhap x = ");
        x = scan.nextInt();
        System.out.println("Nhap y = ");
        y = scan.nextInt();

        //C1: Kiem tra dieu kien cua y -> thuc hien phep chia (if/else) -> Su dung cach nay
        try {
            int s = x / y;
            System.out.println("s = " + s);
        } catch (ArithmeticException e) {
            System.out.println("Xu ly exception ...");
        } finally {
            System.out.println("Finally ...");
        }

        System.out.println("Finish ...");
    }
}

#Test.java

/*
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 */
package java2.lesson01;

/**
 *
 * @author diepvan
 */
public class Test {
    public static void main(String[] args) {
        Light light = new Light();
        light.status = Light.STATUS.ON;
        
    }
}

#Test02.java

/*
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 * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
 */
package java2.lesson01;

import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Deque;
import java.util.HashMap;
import java.util.Map;
import java.util.Queue;
import java.util.Vector;

/**
 *
 * @author diepvan
 */
public class Test02 {
    public static void main(String[] args) {
        //B1. Khai bao
        ArrayList<Integer> list = new ArrayList<>();
        Vector<Integer> list2 = new Vector<>();
        list2.add(6);
        
        //B2. Them phan tu vao trong mang
        list.add(12);
        list.add(2);
        list.add(22);
        list.add(62);
        list.add(99); //Mang nay co bao nhieu phan tu??? -> 5 phan tu
        
        //B3. Lay phan tu trog mang
        System.out.println("In phan tu 1 > " + list.get(1));
        
        for (int i = 0; i < list.size(); i++) {
            System.out.println("In phan tu > " + list.get(i));
        }
        
        //B4. Xoa phan tu trong mang
        //index = 1
        list.remove(1);
        
        //B5. Chen 1 phan tu vao trong mang -> index = 1: 100
        list.add(1, 100);
        
        //B6. Xoa ALL
        list.clear();
        
        Map<String, String> map = new HashMap<>();
        //key: int, String
        //value: all data type
        map.put("fullname", "Tran Van A");
        map.put("fullname", "Tran Van B");

        System.out.println(map.get("fullname"));
        
        map.remove("fullname");
        
        for (Map.Entry<String, String> entry : map.entrySet()) {
            String key = entry.getKey();
            String val = entry.getValue();
            
            
        }
        
        //Queue
        Deque<String> stack = new ArrayDeque<>();
        stack.push("1");
        stack.push("2");
        stack.push("3");
        stack.push("4");
        stack.push("5");
        
        System.out.println(stack.pop());
    }
}