Nội dung học:

	- Loop (For, while, do ... while, foreach)
	- Array
		- Array Index
		- ArrayList
		- Vector
==========================================================

#Test.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.c2307l.lesson02;

import java.util.ArrayList;

/**
 *
 * @author diepvan
 */
public class Test {
    public static void main(String[] args) {
        //B1. Khai bao mang dong -> Su dung ArrayList
        //length: 0, index: 0 -> length - 1
        //lenght: iList.size()
        ArrayList<Integer> iList = new ArrayList<>();
        
        //B2. Them phan tu vao trong mang
        iList.add(100);//length: 1, index: 0 -> {100}
        iList.add(20);//length: 2, index: 0 - 1 -> {100, 20}
        iList.add(11);//length: 3, index: 0 - 2 -> {100, 20, 11}
        
        //B3. Lay phan tu trong mang ra
        //index = 1
        System.out.println("index:1 -> " + iList.get(1));
        for (int i = 0; i < iList.size(); i++) {
            System.out.println("index:" + i +" -> " + iList.get(i));
        }
        //foreach
        for (Integer v : iList) {
            System.out.println("v = " + v);
        }
        
        //B4. Xoa phan tu trong mang
        //Xoa phan tu index = 1
        iList.remove(1);//length: 2, index: 0 - 1 -> {100, 11}
        
        //B5. Chen phan tu vao trong mang
        //Chen phan tu 200 vao vi tri index = 1
        iList.add(1, 200); //length: 3, index: 0 - 2 -> {100, 200, 11}
        
        //B6. Thay du lieu trong mang
        //Thay gia tri tai vi tri index: 1 -> Thanh 3000
        iList.set(1, 3000);//length: 3, index: 0 - 2 -> {100, 3000, 11}
        
        //B7. Xoa tat ca cac phan tu trong mang
        iList.clear(); //length: 0, index: -> {}
        
        //Tuong tu -> tao mang dong: String, char, double, float, ...
        ArrayList<String> sList = new ArrayList<>();
        for (String s : sList) {
            System.out.println("s = " + s);
        }
        
        ArrayList<Character> cList = new ArrayList<>();
        for (Character c : cList) {
            System.out.println("c = " + c);
        }
    }
}

#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.c2307l.lesson02;

import java.util.Scanner;

/**
 *
 * @author diepvan
 */
public class Main {
    public static void main(String[] args) {
        int num1 = 1;
        int num2 = 30;
        
        /**
         * num1 = 14, num2 = 17 -> num1 = 15, num2 = 16
         * num1 = 15, num2 = 16 -> num1 = 16, num2 = 15
         * num1 = 16, num2 = 15 -> num1 = 17, num2 = 14
         */
        while(num1++ < num2--);
        
        System.out.println("num1 = " + num1);
        System.out.println("num2 = " + num2);
        
        Scanner abc = new Scanner(System.in);
        
        //Phan 2: Array Index -> Vi du la Array index: Int
        //B1. Khai bao mang
        //Do dai cua mang -> 7 (t.length, m.length)
        //Giai index: 0 -> length - 1 (0 -> 6)
        int[] t = new int[7];
        int m[] = new int[7];
        
        //B2. Them phan tu vao trong
        //Xac dinh vi tri can them du lieu vao
        //index: 1 -> 20
        t[1] = 20;
        
        //Bo sung du lieu theo 3, 8, 1, 0, 5, -2, 32
        t[0] = 3;
        t[1] = 8;
        t[2] = 1;
        t[3] = 0;
        t[4] = 5;
        t[5] = -2;
        t[6] = 32;
        for (int i = 0; i < 7; i++) {
            System.out.println("Nhap t["+i+"] = ");
            t[i] = Integer.parseInt(abc.nextLine());//Nhap string: abc.nextLine() -> Chuyen string thanh int: Integer.parseInt
            //abc.nextInt()
        }
        
        //B3. Lay phan tu trong mang ra
        //Lay du lieu tai vi tri nao -> index: 2
        System.out.println("t[2] = " + t[2]);
        for (int i = 0; i < t.length; i++) {
            System.out.println("t["+i+"]=" + t[i]);
        }
        
        //B4. Xoa phan tu trong mang -> Voi mang index -> reset du lieu = 0
        //index: 2
        t[2] = 0;
        
        //B5. Xoa tao bo du lieu
        t = new int[7];
        //Khai bao mang String, char, boolean, float, double, ...
        String[] list = new String[20];
        char[] cList = new char[30];
        
        //Van de gap phai
        //t -> gom 7 phan tu. Bai toan -> Mo rong mang len 20 phan tu
        //Chung ta se lam the nao???
        t = new int[20];//Gap van de gi -> mat du lieu da nhap truoc do.
        //Lam sao de ko mat du lieu da nhap truoc do???
        int k[] = new int[20];
        //Copy du lieu tu t -> k
        for (int i = 0; i < t.length; i++) {
            k[i] = t[i];
        }
        //Nhap du lieu tiep theo cho k
        //Gan lai k -> t
        t = new int[20];
        //copy k -> t
        //Lam nhu nay -> kha mat tgian code
        //Dang can 1 mang dong
        //So phan tu trong mang -> thay doi duoc: 7, 20, 2, 11, 100, ...
        //Chung ta se lam cach nao???
        
        //Array Index: 30, 11, 20, 100, 44
        int kk[] = {30, 11, 20, 100, 44};//length: 5, index: 0 -> 4
    }
}