Nội dung kiến thức:
- Exception (Try .. Catch .. Finally) -> Crash
	 - Logic: chia cho 0, ArrayIndexOutoff boundnary, ..., null, ...
	 - System: Memory, Thiet bi phan chung
	 - Middle Ware: Network, ...
	 - Third Party: API, ...
- Package trong Java
- Mã hóa (md5, base64, ...)
==============================================

#Main.java

/*
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package lesson07;

import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;
import lesson07.bt999.CTivi;

/**
 *
 * @author Diep.Tran
 */
public class Main {
    public static void main(String[] args) {
//        CTivi tivi = null;
//        tivi.On();
        
        Scanner scan = new Scanner(System.in);
        System.out.println("Nhap x = ");
        int x = scan.nextInt();
        
        System.out.println("Nhap y = ");
        int y = scan.nextInt();
        
        //C1: Fix logic -> Bat buoc fix theo cach nay
        /**if(y == 0) {
            System.out.println("Ko dc chia cho 0");
        } else {
            int s = x/y;
            System.out.println("Ket qua s = " + s);
        }*/
        try {
            //Noi de code -> nghi van se gay ra chet chuong trinh
            int s = x/y;
            System.out.println("Ket qua s = " + s);
            
            int[] t = new int[2];
            //index: 0 -> 1, length: 2
            t[1] = 12;
            t[6] = 10;
            
            System.out.println("OKOK");
        } catch(ArithmeticException e) {
            System.out.println("ArithmeticException ...");
        } catch(ArrayIndexOutOfBoundsException e) {
            System.out.println("ArrayIndexOutOfBoundsException ...");
        } catch(Exception abc) {
            System.out.println("Exception Chet chuong trinh");
        } finally {
            System.out.println("Finally");
        }
        
        float ss;
        try {
            ss = Calculator.chia(x, y);
            System.out.println("ss = " + ss);
        } catch (CalculatorException ex) {
            ex.showMsg();
        }
        
        //https://www.javatpoint.com/java-date-to-string
        //https://www.javatpoint.com/java-string-to-date
        //https://stackoverflow.com/questions/3581258/adding-n-hours-to-a-date-in-java
    }
}

#CalculatorException.java

/*
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 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package lesson07;

/**
 *
 * @author Diep.Tran
 */
public class CalculatorException extends Exception{
    float x, y;

    public CalculatorException(float x, float y, String string) {
        super(string);
        this.x = x;
        this.y = y;
    }
    
    public void showMsg() {
        System.out.println("x = " + x + ", y = " + y + ", " + getMessage());
    }
}

#Calculator.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package lesson07;

/**
 *
 * @author Diep.Tran
 */
public class Calculator {
    public static float cong(float x, float y) {
        return x + y;
    }
    public static float tru(float x, float y) {
        return x - y;
    }
    public static float nhan(float x, float y) {
        return x * y;
    }
    
    public static float chia(float x, float y) throws CalculatorException {
        if(y == 0) {
//            System.out.println("Ko duoc phep chia cho 0");
//            return 0;
            throw new CalculatorException(x, y, "Ko duoc phep chia cho 0");
        }
        return x / y;
    }
}