Chương trình quản lý sinh viên bằng HashMap - Java Advanced

#C2108L.java

/*
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 */
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);
        }
    }
    
}

#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;
    }
    
    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;
    }
    
    
}