#C2108L.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 bt1058;

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

/**
 *
 * @author Administrator
 */
public class C2108L {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        HashMap<String, Student> studentList = new HashMap<>();
        
        Scanner scan = new Scanner(System.in);
        
        System.out.println("Nhap so sinh vien can them: ");
        int n = Integer.parseInt(scan.nextLine());
        
        for (int i = 0; i < n; i++) {
            Student std = new Student();
            std.input();
            
            //Them phan tu nay vao day???
            //Su dung rollno lam key trong mang HashMap
            studentList.put(std.getRollno(), std);
        }
        
        //Duyet qua cac phan tu trong HashMap
        for (Map.Entry<String, Student> entry : studentList.entrySet()) {
            String key = entry.getKey();
            Student std = entry.getValue();
            System.out.println("KEY: " + key);
            std.display();
        }
        
        System.out.println("Nhap MSV can tim kiem: ");
        String rollno = scan.nextLine();
        
        Student std = studentList.get(rollno);
        if(std != null) {
            std.display();
        } else {
            System.out.println("Ko tim thay sinh vien co msv: " + rollno);
        }
        
        System.out.println("Nhap MSV can tim kiem: ");
        rollno = scan.nextLine();
        
        std = studentList.get(rollno);
        if(std != null) {
            std.display();
        } else {
            System.out.println("Ko tim thay sinh vien co msv: " + rollno);
        }
    }
    
}

#DataMgr.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 bt1058;

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

/**
 *
 * @author Administrator
 */
public class DataMgr<E extends Student>{
    List<E> dataList;

    public DataMgr() {
        dataList = new ArrayList<>();
    }
    
    public void add(E e) {
        dataList.add(e);
    }
    
    public void input() {
        System.out.println("Nhap du lieu");
    }
    
    public void display() {
        for (E e : dataList) {
            System.out.println(e);
        }
    }
}

#Student.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 bt1058;

import java.util.Scanner;

/**
 *
 * @author Administrator
 */
public class Student {
    String rollno, name, gender, email, address;
    int age;

    public Student() {
    }
    
    public void input() {
        Scanner scan = new Scanner(System.in);
        
        System.out.println("Nhap MSV: ");
        rollno = scan.nextLine();
        
        System.out.println("Nhap ten: ");
        name = scan.nextLine();
        
        System.out.println("Nhap gioi tinh: ");
        gender = scan.nextLine();
        
        System.out.println("Nhap email: ");
        email = scan.nextLine();
        
        System.out.println("Nhap dia chi: ");
        address = scan.nextLine();
        
        System.out.println("Nhap tuoi: ");
        age = Integer.parseInt(scan.nextLine());
    }

    public void display() {
        System.out.println(this);
    }

    @Override
    public String toString() {
        return "rollno=" + rollno + ", name=" + name + ", gender=" + gender + ", email=" + email + ", address=" + address + ", age=" + age + "\n";
    }
    
    public String getRollno() {
        return rollno;
    }

    public void setRollno(String rollno) {
        this.rollno = rollno;
    }

    public String getName() {
        return name;
    }

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

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getAddress() {
        return address;
    }

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

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
    
    
}

#Test01.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 bt1058;

import java.util.ArrayList;

/**
 *
 * @author Administrator
 */
public class Test01 {
    public static void main(String[] args) {
        //Noi dung kien thuc
        //Generic:
        //  Class Object
        //      Khoi tao object -> Chuyen kieu du lieu quan vao trong luc khoi tao object
        ArrayList<Integer> list1 = new ArrayList<>();
        list1.add(12);
        list1.add(3);
        list1.add(102);
        
        for (Integer v : list1) {
            System.out.println("v = " + v);
        }
        
        //Vi du 2
        ArrayList<String> list2 = new ArrayList<>();
        list2.add("Vi du 1");
        list2.add("Vi du 2");
        list2.add("Vi du 3");
        
        for (String v : list2) {
            System.out.println("v = " + v);
        }
        
        DataMgr<Student> d1 = new DataMgr<>();
        d1.add(new Student());
//        d1.add("123123");
        d1.input();
        d1.display();
        
//        DataMgr<String> d2 = new DataMgr<>();
//        d2.add("asds");
//        d2.add("tertert");
//        d2.add("ertertret");
        
        
    }
}

#Test2.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 bt1058;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author Administrator
 */
public class Test2 {
    public static void main(String[] args) {
        //testFile();
        
        //Ghi noi dung du lieu vao File
//        testWriteFile();
//        testWriteFile2();
//        testWriteFile3();
//        testReadFile();
//        testReadFile2();
        testWriteFile4();
    }
    
    static void testWriteFile4() {
        String filename = "vidu3.txt";
        
        FileWriter writer = null;
        BufferedWriter bWriter = null;
        
        try {
            writer = new FileWriter(filename);
            bWriter = new BufferedWriter(writer);
            
            String line = "Sinh viên Aptech 54 Lê Thanh Nghi";
            bWriter.write(line);
        } catch (IOException ex) {
            Logger.getLogger(Test2.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            if(bWriter != null) {
                try {
                    bWriter.close();
                } catch (IOException ex) {
                    Logger.getLogger(Test2.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
            if(writer != null) {
                try {
                    writer.close();
                } catch (IOException ex) {
                    Logger.getLogger(Test2.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
    }
    
    static void testReadFile2() {
        String filename = "student.txt";
        
        //Thu vien de su dung -> do nghi noi dung utf8
        FileReader reader = null;
        BufferedReader bReader = null;
        
        try {
            reader = new FileReader(filename);
            bReader = new BufferedReader(reader);
            
            String line;
            
            while((line = bReader.readLine()) != null) {
                System.out.println(line);
            }
        } catch (FileNotFoundException ex) {
            Logger.getLogger(Test2.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(Test2.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            if(reader != null) {
                try {
                    reader.close();
                } catch (IOException ex) {
                    Logger.getLogger(Test2.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
            
            if(bReader != null) {
                try {
                    bReader.close();
                } catch (IOException ex) {
                    Logger.getLogger(Test2.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
        
    }
    
    static void testReadFile() {
        String filename = "student.txt";
        
        //Khai bao
        FileInputStream fis = null;
        StringBuilder builder = new StringBuilder();
        
        try {
            //B1. Mo ket noi file
            fis = new FileInputStream(filename);
            
            //B2. Doc noi dung
            int code;
            while((code = fis.read()) != -1) {
                builder.append((char)code);
            }
            
            System.out.println(builder.toString());
        } catch (FileNotFoundException ex) {
            Logger.getLogger(Test2.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(Test2.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            //B3. Dong ket noi
            if(fis != null) {
                try {
                    fis.close();
                } catch (IOException ex) {
                    Logger.getLogger(Test2.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
    }
    
    private static void testWriteFile3() {
        String filename = "student.txt";
        Scanner scan = new Scanner(System.in);
        
        //Nhap thong tin N sinh vien
        System.out.println("Nhap N sinh vien: ");
        int N = Integer.parseInt(scan.nextLine());
        
        ArrayList<Student> stdList = new ArrayList<>();
        for (int i = 0; i < N; i++) {
            Student std = new Student();
            std.input();
            
            stdList.add(std);
        }
        //Luu thong tin sinh vien vao file student.txt -> thong tin sinh vien -> moi thang 1 dong
        
        //Khai bao thu vien se su dung trong luu file
        FileOutputStream fos = null;
        
        //B1. Mo ket noi toi File
        try {
            fos = new FileOutputStream(filename);
            
            //B2. Ghi noi dung vao File
            for (Student student : stdList) {
                String line = student.toString();
                byte[] bytes = line.getBytes("utf8");
                
                fos.write(bytes);
            }
        } catch (FileNotFoundException ex) {
            Logger.getLogger(Test2.class.getName()).log(Level.SEVERE, null, ex);
        } catch (UnsupportedEncodingException ex) {
            Logger.getLogger(Test2.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(Test2.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            //B3. Dong ket noi
            if(fos != null) {
                try {
                    fos.close();
                } catch (IOException ex) {
                    Logger.getLogger(Test2.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
    }
    
    static void testWriteFile() {
        String filename = "vidu1.txt";
//        String filename = "C:\\Users\\Administrator\\Desktop\\vidu.txt";
        
        //Khai bao thu vien se su dung trong luu file
        FileOutputStream fos = null;
        
        //B1. Mo ket noi toi File
        try {
            fos = new FileOutputStream(filename);
            
            //B2. Ghi noi dung vao File
            String line = "Sinh vien Aptech 54 Le Thanh Nghi";
            byte[] bytes = line.getBytes("utf8");
            fos.write(bytes);
        } catch (FileNotFoundException ex) {
            Logger.getLogger(Test2.class.getName()).log(Level.SEVERE, null, ex);
        } catch (UnsupportedEncodingException ex) {
            Logger.getLogger(Test2.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(Test2.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            //B3. Dong ket noi
            if(fos != null) {
                try {
                    fos.close();
                } catch (IOException ex) {
                    Logger.getLogger(Test2.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
        
    }

    private static void testWriteFile2() {
        String filename = "vidu2.txt";
        Scanner scan = new Scanner(System.in);
        
        //Khai bao thu vien se su dung trong luu file
        FileOutputStream fos = null;
        
        //B1. Mo ket noi toi File
        try {
            fos = new FileOutputStream(filename, true);
            
            //B2. Ghi noi dung vao File
            String line;
            do {
                line = scan.nextLine();
                byte[] bytes = (line + "\n").getBytes("utf8");
                fos.write(bytes);
            } while(!line.equalsIgnoreCase("N"));
        } catch (FileNotFoundException ex) {
            Logger.getLogger(Test2.class.getName()).log(Level.SEVERE, null, ex);
        } catch (UnsupportedEncodingException ex) {
            Logger.getLogger(Test2.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(Test2.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            //B3. Dong ket noi
            if(fos != null) {
                try {
                    fos.close();
                } catch (IOException ex) {
                    Logger.getLogger(Test2.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
    }
    
    /**
     * Phan 1: Test File
     */
    static void testFile() {
        String filePath = "C:\\Users\\Administrator\\Downloads\\Professional Programming in Java - Slide.zip";
        
        File file = new File(filePath);
        
        if(file.exists()) {
            System.out.println("Duong dan ton tai");
        } else {
            System.out.println("Duong dan ko ton tai");
        }
        
        if(file.isFile()) {
            System.out.println("Duong dan la File");
        } else {
            System.out.println("Duong dan la folder");
        }
    }
}