#TestController.java

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package java2.lesson02;

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

/**
 *
 * @author Diep.Tran
 */
public class TestController<E, F, G, H extends Book> {
    List<E> dataList1;
    List<F> dataList2;
    List<G> dataList3;
    List<H> dataList4;
    
    public TestController() {
        dataList1 = new ArrayList<>();
        dataList2 = new ArrayList<>();
        dataList3 = new ArrayList<>();
        dataList4 = new ArrayList<>();
    }
    
    public void addE(E e) {
        dataList1.add(e);
    }
    
    public void addF(F e) {
        dataList2.add(e);
    }
    
    public void addG(G e) {
        dataList3.add(e);
    }
    
    public void addH(H e) {
        dataList4.add(e);
    }
    
    public void showLength() {
        System.out.println("dataList1.size = " + dataList1.size());
        System.out.println("dataList2.size = " + dataList2.size());
        System.out.println("dataList3.size = " + dataList3.size());
        System.out.println("dataList4.size = " + dataList4.size());
    }
}

#Test.java

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package java2.lesson02;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author Diep.Tran
 */
public class Test {
    public static void main(String[] args) {
        //testFile();
        //saveFile1();
        //saveFile2();
        //readFile1();
        //readFile2();
        //saveBook();
        //readBook();
        //saveBook2();
        readBook2();
    }
    
    static void readBook2() {
        List<Book> bookList;
        
        FileInputStream fis = null;
        ObjectInputStream ois = null;
        
        try {
            fis = new FileInputStream("books.dat");
            ois = new ObjectInputStream(fis);
            
            bookList = (List<Book>) ois.readObject();
            
            for (Book book : bookList) {
                System.out.println(book.getFileLine());
            }
        } catch (FileNotFoundException ex) {
            Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
        } catch (ClassNotFoundException ex) {
            Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            if(fis != null) {
                try {
                    fis.close();
                } catch (IOException ex) {
                    Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
            
            if(ois != null) {
                try {
                    ois.close();
                } catch (IOException ex) {
                    Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
    }
    
    static void saveBook2() {
        //Fake data -> nhap du lieu tu ban phim.
        List<Book> bookList = new ArrayList<>();
        bookList.add(new Book("LAP TRINH C", "APTECH", 100000));
        bookList.add(new Book("LAP TRINH HTML/CSS/JS", "APTECH", 200000));
        bookList.add(new Book("LAP TRINH BootStrap/jQuery", "APTECH", 150000));
        bookList.add(new Book("LAP TRINH SQL Server 2019", "APTECH", 300000));
        bookList.add(new Book("LAP TRINH PHP/Laravel", "APTECH", 500000));
        
        FileOutputStream fos = null;
        ObjectOutputStream oos = null;
        
        try {
            fos = new FileOutputStream("books.dat");
            
            oos = new ObjectOutputStream(fos);
            
            oos.writeObject(bookList);
        } catch (FileNotFoundException ex) {
            Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            if(fos != null) {
                try {
                    fos.close();
                } catch (IOException ex) {
                    Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
            
            if(oos != null) {
                try {
                    oos.close();
                } catch (IOException ex) {
                    Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
    }
    
    static void readBook() {
        List<Book> bookList = new ArrayList<>();
        FileReader reader = null;
        BufferedReader bufferedReader = null;
        
        try {
            reader = new FileReader("books.txt");
            bufferedReader = new BufferedReader(reader);
            
            String line;
            bufferedReader.readLine();//Bo qua dong header
            while((line = bufferedReader.readLine()) != null) {
                Book book = new Book();
                book.parseFileLine(line);
                
                bookList.add(book);
            }
            
            for (Book book : bookList) {
                System.out.println(book.getFileLine());
            }
        } catch (FileNotFoundException ex) {
            Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            if(reader != null) {
                try {
                    reader.close();
                } catch (IOException ex) {
                    Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
            
            if(bufferedReader != null) {
                try {
                    bufferedReader.close();
                } catch (IOException ex) {
                    Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
    }
    
    static void saveBook() {
        //Fake data -> nhap du lieu tu ban phim.
        List<Book> bookList = new ArrayList<>();
        bookList.add(new Book("LAP TRINH C", "APTECH", 100000));
        bookList.add(new Book("LAP TRINH HTML/CSS/JS", "APTECH", 200000));
        bookList.add(new Book("LAP TRINH BootStrap/jQuery", "APTECH", 150000));
        bookList.add(new Book("LAP TRINH SQL Server 2019", "APTECH", 300000));
        bookList.add(new Book("LAP TRINH PHP/Laravel", "APTECH", 500000));
        
        //Luu thong tin danh sach book -> vao 1 file txt thi lam nhu the nao?
        //B1. Duyet qua cac phan tu trong bookList
        //B2. Luu String line = book.toString() -> File
        //B3. Dong File
        
        FileOutputStream fos = null;
        
        try {
            fos = new FileOutputStream("books.txt", false);
            String line = "Name, Author Name, Price\n";
            byte[] data = line.getBytes("utf8");
            fos.write(data);
                
            for (Book book : bookList) {
                line = book.getFileLine();
                data = line.getBytes("utf8");
                fos.write(data);
            }
        } catch (FileNotFoundException ex) {
            Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
        } catch (UnsupportedEncodingException ex) {
            Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            if(fos != null) {
                try {
                    fos.close();
                } catch (IOException ex) {
                    Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
    }
    
    static void readFile2() {
        FileReader reader = null;
        BufferedReader bufferedReader = null;
        
        StringBuilder builder = new StringBuilder();
        
        try {
            reader = new FileReader("file2.txt");
            bufferedReader = new BufferedReader(reader);
            
            String line;
            
            while((line = bufferedReader.readLine()) != null) {
                builder.append(line + "\n");
            }
            
            System.out.println(builder.toString());
        } catch (FileNotFoundException ex) {
            Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            if(reader != null) {
                try {
                    reader.close();
                } catch (IOException ex) {
                    Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
            
            if(bufferedReader != null) {
                try {
                    bufferedReader.close();
                } catch (IOException ex) {
                    Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
        
    }
    
    static void readFile1() {
        FileInputStream fis = null;
        StringBuilder builder = new StringBuilder();
        
        try {
            fis = new FileInputStream("file2.txt");//ASCII
            
            int code;
            while((code = fis.read()) != -1) {
                builder.append((char) code);
            }
            
            System.out.println(builder.toString());
        } catch (FileNotFoundException ex) {
            Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            if(fis != null) {
                try {
                    fis.close();
                } catch (IOException ex) {
                    Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
    }
    
    static void saveFile2() {
        //Bai toan: Luu du lieu nhap tu ban phim vao file: file2.txt -> thoat luu khi chuoi nhap vao la 'N'
        Scanner scan = new Scanner(System.in);
        String line;
        
        FileOutputStream fos = null;
        
        try {
            fos = new FileOutputStream("file2.txt", true);
            
            do {
                System.out.println("Nhap chuoi can them: ");
                line = scan.nextLine();
                
                byte[] data = (line + "\n").getBytes("utf8");
                
                fos.write(data);
            } while(!line.equalsIgnoreCase("N"));
        } catch (FileNotFoundException ex) {
            Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
        } catch (UnsupportedEncodingException ex) {
            Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            if(fos != null) {
                try {
                    fos.close();
                } catch (IOException ex) {
                    Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
    }
    
    static void saveFile1() {
        //Bai toan: Luu String vao trong File
        String str = "Sinh viên Aptech - 54 Lê Thanh Nghị";
        
        FileOutputStream fos = null;
        
        try {
            fos = new FileOutputStream("file1.txt");
            
            byte[] data = str.getBytes("utf8");
            fos.write(data);
        } catch (FileNotFoundException ex) {
            Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
        } catch (UnsupportedEncodingException ex) {
            Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            if(fos != null) {
                try {
                    fos.close();
                } catch (IOException ex) {
                    Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
    }
    
    static void testFile() {
        //Ham can ban trong File
        File file = new File("test.txt");
        if(file.exists()) {
            System.out.println("File exist: " + file.getAbsolutePath());
        } else {
            System.out.println("Not exist");
            try {
                file.createNewFile();
                
                System.out.println("Create new file successfully!!!");
            } catch (IOException ex) {
                Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
            }
        }
        
        //Su dung File class -> duyet folder trong may tinh
        file = new File("./");
        File[] fileList = file.listFiles();
        
        for (File f : fileList) {
            if(f.isFile()) {
                System.out.println(f.getPath() + " -> File");
            } else {
                System.out.println(f.getPath() + " -> Folder");
            }
        }
    }
}

#Main.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 java2.lesson02;

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

/**
 *
 * @author Diep.Tran
 */
public class Main {
    public static void main(String[] args) {
        //Phan 1: Generic
        ArrayList<Integer> a1 = new ArrayList<>();
        a1.add(12);
        a1.add(23);
        a1.add(43);
//        a1.add("sdsdf");
        
        ArrayList<String> a2 = new ArrayList<>();
        a2.add("asd");
        a2.add("fsd324");
        a2.add("sd4545");
//        a2.add(23);
        
        //Cau hoi 1: ArrayList<Integer> & ArrayList<String> => May class object
        //Cau hoi 2: Tai a1.add(12) -> dung, a1.add("asd") -> error? tuong tu vs a2.
        
        ArrayList<Book> bookList = new ArrayList<>();
        bookList.add(new Book("A", "ABC"));
        bookList.add(new Book("B", "ABC"));
        
        TestController<String, String, Integer, Book> testController = new TestController<>();
        testController.addE("231");
        testController.addE("54");
        testController.addE("23");
        
        testController.addH(new Book("A", "ASS"));
        
        testController.showLength();
    }
}

#Book.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.
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package java2.lesson02;

import java.io.Serializable;

/**
 *
 * @author Diep.Tran
 */
public class Book implements Serializable{
    String name, authorName;
    int price;

    public Book(String name, String authorName) {
        this.name = name;
        this.authorName = authorName;
    }

    public Book() {
    }

    public Book(String name, String authorName, int price) {
        this.name = name;
        this.authorName = authorName;
        this.price = price;
    }

    public String getName() {
        return name;
    }

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

    public String getAuthorName() {
        return authorName;
    }

    public void setAuthorName(String authorName) {
        this.authorName = authorName;
    }

    public int getPrice() {
        return price;
    }

    public void setPrice(int price) {
        this.price = price;
    }

    @Override
    public String toString() {
        return "Book{" + "name=" + name + ", authorName=" + authorName + ", price=" + price + '}' + "\n";
    }
    
    public String getFileLine() {
        return name + ", " + authorName + ", " + price + "\n";
    }
    
    public void parseFileLine(String line) {
        String[] params = line.split(", ");
        name = params[0];
        authorName = params[1];
        price = Integer.parseInt(params[2]);
    }
}