#ExceptionTest.java

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package com.gokisoft.lesson01;

import java.util.Scanner;

/**
 *
 * @author teacher
 */
public class ExceptionTest {
    static enum STATUS {ON, OFF}; //using
    static int status = 0;//status = 0 -> OFF, 1: ON -> kho maintain
    
    /**
     * @param args the command line arguments
     * Unit Test:
     *      Nghi ra tat ca cac TH (cases)
     *          Input & Output
     *              Input: (x=8, y=2) -> s= 4 -> testcase01
     *              Input: (x=8, y=0) -> Exception -> testcase02
     *          Converage: 85-90%
     */
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        System.out.println("Nhap x = ");
        int x = Integer.parseInt(scan.nextLine());
        System.out.println("Nhap y = ");
        int y = Integer.parseInt(scan.nextLine());
        
        try {
            int s = x/y; //Trong TH: y = 0 -> crash (Exception)
            System.out.println("s = " + s);
        } catch(ArithmeticException e) {
            System.out.println("Error -> devide / 0");
        }
        
        int[] t = {1, 5, 8}; //length = 3; index = 0 -> 2
        System.out.println("t[1] = " + t[1]);
        try {
            System.out.println("t[5] = " + t[5]); //TH -> crash (Exception)
            //Error -> logic -> Fix
        } catch(ArrayIndexOutOfBoundsException e) {
            System.out.println("Error > index");
        }
    }
    
}

#Main.java

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package com.gokisoft.lesson01;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Vector;

/**
 *
 * @author teacher
 */
public class Main {
    public static void main(String[] args) {
//        Nội dung kiến thức:
//	- Exception
//	- Collections
//		- List
//			- ArrayList
//			- Vector
//		- Set
//		- Map
//			- HashMap
//		- Stack & Queue
//	- File
//	- Thread
//	- CSDL
//		- MySQL
//	- Java Swing / Java FX
//	- Mục Khác
//===========================================================

        //SET -> Collections
        //ArrayList
        ArrayList<Integer> list = new ArrayList<>();
        Vector<Integer> list2 = new Vector<>(); //Su dung list & list2 nhu nhau
        list2.add(2323);
        
        //B1. Them phan tu vao trong mang
        list.add(12);
        list.add(22);
        list.add(220);
        
        //B2. Lay du lieu ra
        System.out.println("0 -> " + list.get(0));
        System.out.println("1 -> " + list.get(1));
        
        for (int i = 0; i < list.size(); i++) {
            System.out.println(i + " -> " + list.get(i));
        }
        
        for (Integer v : list) {
            System.out.println("v -> " + v);
        }
        
        //B3. Xoa phan tu trong  mang
        //12, 22, 220 -> remove (index = 1) -> del 22 -> don mang -> 12, 220
        list.remove(1);
        
        for (int i = 0; i < list.size(); i++) {
            System.out.println(i + " -> " + list.get(i));
        }
        
        //B4. Chen 1 phan vao trong mang
        //12, 220 -> insert 900 (index = 1) -> 12, 900, 220
        list.add(1, 900);
        list.add(1, 300); //12, 300, 900, 220
        
        for (Integer v : list) {
            System.out.println("v -> " + v);
        }
        
        //SET
        HashSet<String> setList = new HashSet<>();
        setList.add("Xin chao");
        setList.add("Xin 234");
        setList.add("Xin 423423");
        
        for (String v : setList) {
            System.out.println("v -> " + v);
        }
        
        //Map
        HashMap<String, String> maps = new HashMap<>();
        maps.put("fullname", "TRAN VAN A");
        maps.put("fullname", "TRAN VAN B");
        maps.put("age", "30");
        
        String fname = maps.get("fullname");
        
        System.out.println(fname);
        
        System.out.println(maps.get("ABC"));
        
        for (Map.Entry<String, String> entry : maps.entrySet()) {
            String key = entry.getKey();
            String value = entry.getValue();
            
            System.out.println("key = " + key + ", value = " + value);
        }
        
        
    }
}

#StringTest.java

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package com.gokisoft.lesson01;

/**
 *
 * @author teacher
 */
public class StringTest {
    public static void main(String[] args) {
        //Cach 1
        String s = "Sinh vien Aptech 54 Le Thanh Nghi";
        
        System.out.println(s);
        
        s += " OKOK";
        
        System.out.println(s);
        
        //Cach 2
        StringBuilder builder = new StringBuilder();//Construct -> Giong Nhau
        
        builder.append("Sinh vien Aptech");//Xu ly bat dong bo
        builder.append(" 54 Le Thanh Nghi");
        
        System.out.println(builder.toString());
        
        //Cach 3StringBuffer
        StringBuffer buffer = new StringBuffer();
        
        buffer.append("Sinh vien Aptech");//Xu ly dong bo
        buffer.append(" 54 Le Thanh Nghi");
        
        System.out.println(buffer.toString());
    }
}

#Test.java

/*
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package com.gokisoft.lesson01;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 *
 * @author teacher
 */
public class Test {
    public static void main(String[] args) {
        String s = "Tran Van Diep";
        //Kiem tra s -> tuan thu cu phap: [a-zA-Z (space)] -> 6 -> 30
        String check = "^[a-zA-Z ]{6,30}$";
        
        Pattern pattern = Pattern.compile(check);
        Matcher matcher = pattern.matcher(s);
        
        if(matcher.find()) {
            System.out.println("Du lieu chinh xac");
        } else {
            System.out.println("Du lieu sai");
        }
    }
}