#Test1.java

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package aptech.java2.lession3;

import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author Diep.Tran
 */
public class Test1 {
    public static void main(String[] args) {
        //Tim hieu ve class FILE
        File file = new File("dist");
        
        if(file.exists()) {
            System.out.println("File exist");
        } else {
            System.out.println("Not exist");
            try {
                file.createNewFile();
            } catch (IOException ex) {
                Logger.getLogger(Test1.class.getName()).log(Level.SEVERE, null, ex);
            }
        }
        String[] list = file.list();
        for (String string : list) {
            System.out.println(string);
        }
        
        //Ung dung kha nhieu: Viet dc 1 chuong duyet toan file trong 1 folder
        //Viet 1 ung dung: Explorer
        
        
    }
}

#Test.java

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package aptech.java2.lession3;

/**
 *
 * @author Diep.Tran
 */
public class Test {
    public static void main(String[] args) {
        DataController<People> controller1 = new DataController<>();
        controller1.add(new People("A1", "Ha Noi"));
        controller1.add(new People("A2", "Ha Nam"));
//        People p1 = new People("A3", "OKOK");
        controller1.add(new People("A3", "Ha Nam"));
        DataController<People> controller2 = new DataController<>();
        controller2.add(new People("A4", "Ha Nam"));
        
        controller1.display();
        
//        DataController<String> controller = new DataController<>();
//        controller.add("123");
//        controller.add("234324234");
//        
//        controller.display();

        DataController<Number> c2 = new DataController<>();
        
    }
}

#Student.java

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package aptech.java2.lession3;

/**
 *
 * @author Diep.Tran
 */
public class Student extends People{
    String rollNo;

    public Student() {
    }

    public Student(String rollNo, String name, String address) {
        super(name, address);
        this.rollNo = rollNo;
    }

    public String getRollNo() {
        return rollNo;
    }

    public void setRollNo(String rollNo) {
        this.rollNo = rollNo;
    }

    @Override
    public String toString() {
        return super.toString() + "Student{" + "rollNo=" + rollNo + '}';
    }
}

#People.java

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package aptech.java2.lession3;

/**
 *
 * @author Diep.Tran
 */
public class People {
    String name, address;

    public People() {
    }

    public People(String name, String address) {
        this.name = name;
        this.address = address;
    }

    public String getName() {
        return name;
    }

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

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    public String toString() {
        return "People{" + "name=" + name + ", address=" + address + '}';
    }
    
    public String getLine() {
        return name + "," + address+"\n";
    }
}

#Number.java

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package aptech.java2.lession3;

/**
 *
 * @author Diep.Tran
 */
public class Number{
    int x1, x2;
    
}

#Main.java

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package aptech.java2.lession3;

import java.util.ArrayList;
import java.util.HashMap;

/**
 *
 * @author Diep.Tran
 */
public class Main {
    public static void main(String[] args) {
        //Khai bao 1 mang quan ly danh sach String
        ArrayList<String> arr1 = new ArrayList<>();
        arr1.add("Vi du 1");
        arr1.add("Vi du 2");
        arr1.add("Vi du 3");
//        arr1.add(12);
        
        String s = arr1.get(1);
        
        System.out.println("s: " + s);
        
        //Khai bao 1 mang quan ly danh sach so nguyen
        ArrayList<Integer> arr2 = new ArrayList<>();
        arr2.add(1);
        arr2.add(5);
//        arr2.add("sdasdasd");
        
        int t = arr2.get(0);
        
        int[] k  = new int[10];
        
        System.out.println("t: " + t);
        
        //Ket luan nhu sau
        //1. ArrayList<String> & ArrayList<Integer> => Cung dang tro toi 1 class object
        //2. add(String) & add(Integer) -> dang su dung 1 ham duy nhat => Ko phai la overloading
        
        HashMap<String, Integer> map = new HashMap<>();
        
        map.put("name", 12);
        map.put("age", 12);
        
//        DataController<String> controller = new DataController<>();
//        controller.add("123");
//        controller.add("234324234");
//        
//        controller.display();
    }
}

#FileInOutStream.java

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package aptech.java2.lession3;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author Diep.Tran
 */
public class FileInOutStream {
    public static void main(String[] args) {
        //Test read
//        readFile();
        //Test write
//        writeFile();
        writeFileStudent();
    }
    
    static void writeFileStudent() {
        FileOutputStream fos = null;
        try {
            File file = new File("student.txt");
            fos = new FileOutputStream(file);
            
            People p1 = new People("A1", "Ha Noi");
            
            byte[] b1 = p1.getLine().getBytes("utf8");
            fos.write(b1);
            
            People p2 = new People("A2", "Nam Dinh");
            byte[] b2 = p2.getLine().getBytes("utf8");
            fos.write(b2);
            //Luu tru du lieu cua 2 object p1 & p2 => File => student.txt
            //Moi sinh vien luu tren 1 line.
            //Dinh nghia 1 cau truc du lieu: name, address
        } catch (FileNotFoundException ex) {
            Logger.getLogger(FileInOutStream.class.getName()).log(Level.SEVERE, null, ex);
        } catch (UnsupportedEncodingException ex) {
            Logger.getLogger(FileInOutStream.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(FileInOutStream.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            if(fos != null) {
                try {
                    fos.close();
                } catch (IOException ex) {
                    Logger.getLogger(FileInOutStream.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
    }
    
    static void writeFile() {
        FileOutputStream fos = null;
        try {
            File file = new File("vidu.txt");
            fos = new FileOutputStream(file, true);
            
            String s = "\nSinh viên Aptech rweryu 348738234 23487234238 4";
            byte[] b = s.getBytes("utf8");
            fos.write(b);
        } catch (FileNotFoundException ex) {
            Logger.getLogger(FileInOutStream.class.getName()).log(Level.SEVERE, null, ex);
        } catch (UnsupportedEncodingException ex) {
            Logger.getLogger(FileInOutStream.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(FileInOutStream.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            if(fos != null) {
                try {
                    fos.close();
                } catch (IOException ex) {
                    Logger.getLogger(FileInOutStream.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
    }
    
    static void readFile() {
        FileInputStream fis = null;
//        InputStreamReader reader = null;
//        BufferedReader bReader = null;
        
        try {
            File file = new File("vidu.txt");
            fis = new FileInputStream(file);
//            reader = new InputStreamReader(fis, StandardCharsets.UTF_8);
//            bReader = new BufferedReader(reader);
            
            int code;
//            byte[] b = new byte[1024];
//            int length = fis.read(b);
//            String s = new String(b, 0, length);
//            System.out.println(s);
            while((code = fis.read()) != -1) {
                //Convert code -> char
                char c = (char) code;
                System.out.print(c);
            }
//            String s;
//            while((s = bReader.readLine()) != null) {
//                System.out.println(s);
//            }
        } catch (FileNotFoundException ex) {
            Logger.getLogger(FileInOutStream.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(FileInOutStream.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            try {
                if(fis != null) {
                    fis.close();
                }
            } catch (IOException ex) {
                Logger.getLogger(FileInOutStream.class.getName()).log(Level.SEVERE, null, ex);
            }
        }
    }
}

#DataController.java

/*
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package aptech.java2.lession3;

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

/**
 *
 * @author Diep.Tran
 */
public class DataController<E> {
    List<E> dataList;
    
    public DataController() {
        dataList = new ArrayList<>();
    }
    
    public void add(E e) {
        dataList.add(e);
    }
    
    public void display() {
        for (E e : dataList) {
            System.out.println(e);
        }
    }
}