2021-03-10 10:32:08

/*
 * 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 sinh_vien;

import java.util.Scanner;

/**
 *
 * @author Admin
 */
public class Sinh_vien {
String RollNo,Name,Sex,Email,Address;
int Age;
Scanner scan = new Scanner(System.in);
    public Sinh_vien() {
    }

    public Sinh_vien(String RollNo, String Name, String Sex, String Email, String Address, int Age) {
        this.RollNo = RollNo;
        this.Name = Name;
        this.Sex = Sex;
        this.Email = Email;
        this.Address = Address;
        this.Age = Age;
    }
public void nhap(){
    System.out.println("RollNo");
    RollNo = scan.nextLine();
    System.out.println("Name");
    Name = scan.nextLine();
    System.out.println("Sex");
    Sex = scan.nextLine();
    System.out.println("Email");
    Email = scan.nextLine();
    System.out.println("Address");
    Address = scan.nextLine();
    System.out.println("Age");
    Age = Integer.parseInt(scan.nextLine());
    System.out.println("");
}

    @Override
    public String toString() {
        return "RollNo=" + RollNo + ", Name=" + Name + ", Sex=" + Sex + ", Email=" + Email + ", Address=" + Address + ", Age=" + Age;
    }

}

2021-03-10 10:14:44

#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.lesson1.QuanLiSinhVienHashMap;

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

/**
 *
 * @author MyPC
 */
public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        Map<String, Student> studentList = new HashMap<>();
        int choose;
        do{
            showMenu();
            System.out.println("Lua chon chuong trinh:");
            choose = Integer.parseInt(scan.nextLine());
            switch(choose){
                case 1:
                    System.out.println("So luong sinh vien muon nhap:");
                    int select = Integer.parseInt(scan.nextLine());
                    for (int i = 0; i < select; i++) {
                        Student student = new Student();
                        student.input();
                        studentList.put(student.rollNo, student);
                    }
                    break;
                case 2:
                    studentList.entrySet().forEach((sinhVien) -> {
                        System.out.println(sinhVien);
                    });
                    break;
                case 3:
                    System.out.println("Nhap ma sinh vien can tim kiem:");
                    int check = 0;
                    String msv = scan.nextLine();
                    for (Map.Entry<String, Student> sinhVien : studentList.entrySet()) {
                        if(sinhVien.getKey().equalsIgnoreCase(msv)){
                            System.out.println("Da tim thay!!");
                            System.out.println(sinhVien);
                            check++;
                            break;
                        }
                    }
                    if(check == 0) System.out.println("Khong tim thay sinh vien!!");
                    break;
                case 4:
                    System.out.println("Tam biet!!");
                    break;
                default:
                    System.out.println("Nhap sai!!");
                    break;
            }
            
        }while(choose != 4 );
    }
    
    static void showMenu(){
        System.out.println("1.Nhap N sinh vien");
        System.out.println("2.In thong tin sinh vien");
        System.out.println("3.Tim kiem sinh vien theo Rollno");
        System.out.println("4.Thoat");
    }
}

#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 Java2.lesson1.QuanLiSinhVienHashMap;

import java.util.Scanner;

/**
 *
 * @author MyPC
 */
public class Student {
    String rollNo, name, sex, email, address;
    int age;

    public Student() {
        
    }

    public Student(String rollNo, String name, String sex, String email, String address, int age) {
        
        this.rollNo = rollNo;
        this.name = name;
        this.sex = sex;
        this.email = email;
        this.address = address;
        this.age = age;
    }
    
    public void input(){
        Scanner scan = new Scanner(System.in);
        System.out.println("Ma sinh vien:");
        rollNo = scan.nextLine();
        System.out.println("Ten:");
        name = scan.nextLine();
        System.out.println("Gioi tinh:");
        sex = scan.nextLine();
        System.out.println("Tuoi:");
        age = Integer.parseInt(scan.nextLine());
        System.out.println("Email:");
        email = scan.nextLine();
        System.out.println("Dia chi:");
        address = scan.nextLine();
    }

    @Override
    public String toString() {
        return "Student{" + "name=" + name + ", sex=" + sex + ", email=" + email + ", address=" + address + ", age=" + age + '}';
    }
    
    
}

2020-04-23 20:20:04

/*
 * 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 HashMap;

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

/**
 *
 * @author Admin
 */
public class Main {
    public static void main(String[] args) {
        Map<String, Student> studentHashMap = new HashMap<>();
        
        Scanner input = new Scanner(System.in);
        int choose;
        
        do {
            showMenu();
            choose = Integer.parseInt(input.nextLine());
            
            switch(choose) {
                case 1:
                    System.out.println("Nhap N: ");
                    int n = Integer.parseInt(input.nextLine());
                    for (int i = 0; i < n; i++) {
                        Student std = new Student();
                        std.input();
                        
                        studentHashMap.put(std.getRollNo(), std);
                    }
                    break;
                case 2:
                    System.out.println("Thong tin sinh vien");
                    for (Map.Entry<String, Student> entry : studentHashMap.entrySet()) {
                        Student value = entry.getValue();
                        value.display();
                    }
                    break;
                case 3:
                    System.out.println("Nhap MSV can tim kiem: ");
                    String rollNo = input.nextLine();
                    
                    Student stdFind = studentHashMap.get(rollNo);
                    stdFind.display();
                    break;
                case 4:
                    System.out.println("Exit!!!");
                    break;
            }
        } while(choose != 4);
    }
    
    static void showMenu() {
        System.out.println("1. Nhap N sinh vien");
        System.out.println("2. In thong tin sinh vien");
        System.out.println("3. Tim kiem sinh vien theo RollNo");
        System.out.println("4. Thoat");
        System.out.println("Chon: ");
    }
}

/*
 * 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 HashMap;

import java.util.Scanner;

/**
 *
 * @author Admin
 */
public class Student {
    String name, rollNo, sex, email, address;
    int age;

    public Student() {
    }

    public Student(String name, String rollNo, String sex, String email, String address, int age) {
        this.name = name;
        this.rollNo = rollNo;
        this.sex = sex;
        this.email = email;
        this.address = address;
        this.age = age;
    }
    public void input() {
        Scanner input = new Scanner(System.in);
        System.out.println("Nhap ten: ");
        name = input.nextLine();
        
        System.out.println("Nhap MSV: ");
        rollNo = input.nextLine();
        
        System.out.println("Nhap gioi tinh: ");
        sex = input.nextLine();
        
        System.out.println("Nhap Email: ");
        email = input.nextLine();
        
        System.out.println("Nhap dia chi: ");
        address = input.nextLine();
        
        System.out.println("Nhap tuoi: ");
        age = Integer.parseInt(input.nextLine());
    }
    @Override
    public String toString() {
        return "Student{" + "name=" + name + ", rollNo=" + rollNo + ", sex=" + sex + ", email=" + email + ", address=" + address + ", age=" + age + '}';
    }
    public void display(){
        System.out.println(this);
    }
            
    public String getName() {
        return name;
    }

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

    public String getRollNo() {
        return rollNo;
    }

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

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    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;
    }

}

2020-04-23 12:47:39

/*
 * 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 QLSVHashMap;

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

/**
 *
 * @author Admin
 */
public class Main {

    public static void main(String[] args) {
        Map<String, Student> studentHashMap = new HashMap<>();

        Scanner input = new Scanner(System.in);
        int choose;

        do {
            showMenu();
            choose = Integer.parseInt(input.nextLine());

            switch (choose) {
                case 1:
                    System.out.println("Enter number: ");
                    int n = Integer.parseInt(input.nextLine());
                    for (int i = 0; i < n; i++) {
                        Student std = new Student();
                        std.input();

                        studentHashMap.put(std.getRollNo(), std);
                    }
                    break;
                case 2:
                    System.out.println("Student information: ");
                    for (Map.Entry<String, Student> entry : studentHashMap.entrySet()) {
                        Student value = entry.getValue();
                        value.display();
                    }
                    break;
                case 3:
                    System.out.println("Enter student code:  ");
                    String rollNo = input.nextLine();

                    Student stdFind = studentHashMap.get(rollNo);
                    stdFind.display();
                    break;
                case 4:
                    System.out.println("Exit!!!");
                    break;
            }
        } while (choose != 4);
    }

    static void showMenu() {
        System.out.println("1. Enter the number of students:");
        System.out.println("2. Display students information: ");
        System.out.println("3. Search students by roll no: ");
        System.out.println("4. Quit.");
        System.out.println("Choose(1 -> 4)1: ");
    }
}

/*
 * 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 QLSVHashMap;

import java.util.Scanner;

/**
 *
 * @author Admin
 */
public class Student {

    String name, rollNo, sex, email, address;
    int age;

    public Student() {
    }

    public Student(String name, String rollNo, String sex, String email, String address, int age) {
        this.name = name;
        this.rollNo = rollNo;
        this.sex = sex;
        this.email = email;
        this.address = address;
        this.age = age;
    }

    public void input() {
        Scanner input = new Scanner(System.in);
        System.out.println("Enter name: ");
        name = input.nextLine();

        System.out.println("Enter student code: ");
        rollNo = input.nextLine();

        System.out.println("Enter sex: ");
        sex = input.nextLine();

        System.out.println("Enter email: ");
        email = input.nextLine();

        System.out.println("Enter address: ");
        address = input.nextLine();

        System.out.println("Enter age: ");
        age = Integer.parseInt(input.nextLine());
    }

    @Override
    public String toString() {
        return "Student{" + "name=" + name + ", rollNo=" + rollNo + ", sex=" + sex + ", email=" + email + ", address=" + address + ", age=" + age + '}';
    }

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

    public String getName() {
        return name;
    }

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

    public String getRollNo() {
        return rollNo;
    }

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

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    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;
    }
}

2020-04-23 07:54:17

/*
 * 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 HashMap;

import java.util.Scanner;

/**
 *
 * @author Redmibook 14
 */
public class Student {

    String RollNo, Name, Email, Address;

    enum SEX {
        MALE, FEMALE
    }
    SEX Sex;
    int Age;

    public Student(String RollNo, String Name, String Email, String Address, int Age) {
        this.RollNo = RollNo;
        this.Name = Name;
        this.Email = Email;
        this.Address = Address;
        this.Age = Age;
    }

    public Student() {
    }

    public String getRollNo() {
        return RollNo;
    }

    public String getName() {
        return Name;
    }

    public String getEmail() {
        return Email;
    }

    public String getAddress() {
        return Address;
    }

    public int getAge() {
        return Age;
    }

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

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

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

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

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

    public void input() {
        Scanner input = new Scanner(System.in);
        System.out.println("Enter rollNo :");
        RollNo = input.nextLine();
        System.out.println("Enter Name :");
        Name = input.nextLine();
        System.out.println("Enter Email :");
        Email = input.nextLine();
        System.out.println("Enter Address :");
        Address = input.nextLine();
        System.out.println("Enter Age :");
        try {
            String StrAge = input.nextLine();
            Age = Integer.parseInt(StrAge);
        } catch (NumberFormatException ex) {
            System.err.println("Age must be a number!");
            return;
        }

        System.out.println("Choose sex :");
        System.out.println("1.Male ");
        System.out.println("2.Female ");
        int choice = Integer.parseInt(input.nextLine());
        switch (choice) {
            case 1:
                Sex = Sex.MALE;
                break;
            case 2:
                Sex = Sex.FEMALE;
                break;

        }
    }

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

    @Override
    public String toString() {
        return "HashMap{" + "RollNo=" + RollNo + ", Name=" + Name + ", Email=" + Email + ", Address=" + Address + ", Sex=" + Sex + ", Age=" + Age + '}';
    }

}

/*
 * 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 HashMap;

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

/**
 *
 * @author Redmibook 14
 */
public class main {

    public static void menu() {
        System.out.println("1.Enter students");
        System.out.println("2.Show students");
        System.out.println("3.Find students");
        System.out.println("4.Exit");
    }

    public static void main(String[] args) {
        HashMap map = new HashMap();
        Scanner input = new Scanner(System.in);
        while (true) {
            menu();
            int choice = Integer.parseInt(input.nextLine());
            switch (choice) {
                case 1:
                    Student student = new Student();
                    student.input();
                    map.put(student.RollNo, student);
                    break;
                case 2:
                    for (Object value : map.values()) {
                        System.out.println(value);
                    }
                    break;
                case 3:
                    System.out.println("Enter RollNo :");
                    String Roll = input.nextLine();
                    if(map.containsKey(Roll)){
                        System.out.println(map.get(Roll));
                    }else{
                        System.out.println("Student rollNo ins't exists!");
                    }
                    break;
            }
        }
    }
}

2020-04-22 14:23:00

/*
 * 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 April22StringBuilder;

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

/**
 *
 * @author Administrator
 */
public class Hashmap {
    public static void main(String[] args) {
        HashMap<String,Student> stdHM = new HashMap<>();
        Scanner input = new Scanner(System.in);
        while(true){
            showMenu();
            System.out.print("choose: ");
            int choose = Integer.parseInt(input.nextLine());
            switch(choose){
                case 1 :
                    System.out.print("Enter number: ");
                    int n = Integer.parseInt(input.nextLine());
                    for(int i=0;i<n;i++){
                        Student std = new Student();
                        System.out.println("\nStudent "+(i+1));
                        std.input();
                        stdHM.put(std.getRollNo(), std);
                    }
                    break;
                case 2:
                    for (Student i : stdHM.values()) {
                        System.out.println("\n");
                        i.output();
                    }
                    break;
                case 3:
                    String rnb = input.nextLine();
                    stdHM.get(rnb).output();
                    break;
                default:
                    System.exit(0);
            }
        }
    }
    
    static void showMenu(){
        System.out.println("\n1.Nhập N sinh viên");
        System.out.println("2.In thông tin sv");
        System.out.println("3.Tìm kiếm sinh viên");
        System.out.println("4.Exit.");
    }
}

/*
 * 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 April22StringBuilder;

import java.util.Scanner;

/**
 *
 * @author Administrator
 */
public class Student {
    String RollNo, Name, Sex, Email, Address;
    int Age;

    public Student() {
    }

    public Student(String RollNo, String Name, String Sex, String Email, String Address, int Age) {
        this.RollNo = RollNo;
        this.Name = Name;
        this.Sex = Sex;
        this.Email = Email;
        this.Address = Address;
        this.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 getSex() {
        return Sex;
    }

    public void setSex(String Sex) {
        this.Sex = Sex;
    }

    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 void input(){
        Scanner input = new Scanner(System.in);
        System.out.print("Insert Rollnumber: ");
        RollNo = input.nextLine();
        System.out.print("Insert Name: ");
        Name = input.nextLine();
        System.out.println("Choose Sex: ");
        System.out.println("1.Male\n2.Female");
        int choose = Integer.parseInt(input.nextLine());
        switch(choose){
            case 1:
                Sex = "Male";
                break;
            case 2:
                Sex = "Female";
                break;
        }
        System.out.print("Insert Age: ");
        Age = Integer.parseInt(input.nextLine());
        System.out.print("Insert Email: ");
        Email = input.nextLine();
        System.out.print("Insert Address: ");
        Address = input.nextLine();
    }

    @Override
    public String toString() {
        return "Student{" + "RollNo=" + RollNo + ", Name=" + Name + ", Sex=" + Sex + ", Email=" + Email + ", Address=" + Address + ", Age=" + Age + '}';
    }
    
    
    
    public void output(){
        System.out.println(toString());
    }
}

2020-03-25 10:59:43

/*
 * 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 QliSvMap;

import static Bt81.Main.showMenu;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

/**
 *
 * @author Administrator
 */
public class Main {
    public static void main(String[] agrs){
        Map<String, Student> studentHashMap = new HashMap<>();
        
        Scanner input = new Scanner(System.in);
        int choose;
        
        do {
            showMenu();
            choose = Integer.parseInt(input.nextLine());
            
            switch(choose){
                case 1:
                    System.out.println("Nhập N: ");
                    int n = Integer.parseInt(input.nextLine());
                    for (int i = 0; i < n; i++){
                        Student std = new Student();
                        std.input();
                        
                        studentHashMap.put(std.getRollNo(), std);
                    }
                    break;
                case 2:
                    System.out.println("Thông tin sinh viên:");
                     for (Map.Entry<String, Student> entry : studentHashMap.entrySet()) {
                        Student value = entry.getValue();
                        value.display();
                    }
                     case 3:
                    System.out.println("Nhap MSV can tim kiem: ");
                    String rollNo = input.nextLine();
                    
                    Student stdFind = studentHashMap.get(rollNo);
                    stdFind.display();
                    break;
                case 4:
                    System.out.println("Exit!!!");
                    break;
            }
        } while(choose != 4);
    }
    
    static void showMenu() {
        System.out.println("1. Nhap N sinh vien");
        System.out.println("2. In thong tin sinh vien");
        System.out.println("3. Tim kiem sinh vien theo RollNo");
        System.out.println("4. Thoat");
        System.out.println("Chon: ");
    }
}

/*
 * 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 QliSvMap;

import java.util.Scanner;

/**
 *
 * @author Administrator
 */
public class Student {
    String RollNo, Name, Email, Sex, Address;
    int Age;

    public Student() {
    }

    public Student(String RollNo, String Name, String Email, String Sex, String Address, int Age) {
        this.RollNo = RollNo;
        this.Name = Name;
        this.Email = Email;
        this.Sex = Sex;
        this.Address = Address;
        this.Age = Age;
    }
    public void input(){
        Scanner input = new Scanner(System.in);
        System.out.println("NHập tên:");
        Name = input.nextLine();
        
        System.out.println("Nhập MSv: ");
        RollNo = input.nextLine();
        
        System.out.println("Nhập giới tính:");
        Sex = input.nextLine();
        
        System.out.println("Nhập Email: ");
        Email = input.nextLine();
        
        System.out.println("Nhập địa chỉ:");
        Address = input.nextLine();
        
        System.out.println("Nhập tuổi: ");
        Age = Integer.parseInt(input.nextLine());
    }

    @Override
    public String toString() {
        return "Student{" + "RollNo=" + RollNo + ", Name=" + Name + ", Email=" + Email + ", Sex=" + Sex + ", Address=" + Address + ", Age=" + Age + '}';
    }
    public void display(){
        System.out.println("this");
    }

    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 getEmail() {
        return Email;
    }

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

    public String getSex() {
        return Sex;
    }

    public void setSex(String Sex) {
        this.Sex = Sex;
    }

    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;
    }
    
    
}

2020-03-24 14:16:14

/*
 * 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 qlsvhashmap;

import java.util.*;

/**
 *
 * @author ASUS
 */
public class main {

    public static void main(String[] args) {
        Map<String, sinhvien> sinhmap = new HashMap<>();
        Scanner scan = new Scanner(System.in);
        int choise, n;
        do {
            menu();
            choise = Integer.parseInt(scan.nextLine());
            switch (choise) {
                case 1:
                    System.out.println("nhap so sv.....");
                    n = Integer.parseInt(scan.nextLine());
                    for (int i = 0; i < n; i++) {
                        sinhvien thao = new sinhvien();
                        thao.input();
                        sinhmap.put(thao.getRollNo(), thao);
                    }
                    break;
                case 2:
                    System.out.println("tt sinh vien");
                    for (Map.Entry<String, sinhvien> entry : sinhmap.entrySet()) {
                        sinhvien thaoxinh = entry.getValue();
                        thaoxinh.display();
                    }
                    break;
                case 3:
                    System.out.println("nhap ma sv can tim");
                    String RollNo = scan.nextLine();
                    sinhvien thaobeou = sinhmap.get(RollNo);
                    thaobeou.display();
                    break;
                case 4:
                    System.out.println("thoat");
                    break;
                default:
                    System.out.println("nhap sai!!!!");
                    break;

            }

        } while (choise != 4);
    }

    static void menu() {
        System.out.println("1. Nhap N sinh vien");
        System.out.println("2. In thong tin sinh vien");
        System.out.println("3. Tim kiem sinh vien theo RollNo");
        System.out.println("4. Thoat");
        System.out.println("Chon: ");
    }
}
//////
/*
 * 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 virut;

import java.util.*;

/**
 *
 * @author ASUS
 */
public class thao {

    static enum thaovirut {
        binhthuong, theodoi, benh;
    }
    String name, cmt, gioitinh, diachi, dctamchu;
    int tuoi;
    thaovirut virut;
    ArrayList<String> addList = new ArrayList<>();

    public thao() {
        virut = thaovirut.binhthuong;
        ArrayList<String> add = new ArrayList<>();
    }

    public void input() {
        Scanner scan = new Scanner(System.in);
        System.out.println("nhap ten:");
        name = scan.nextLine();
        System.out.println("nhap Cmt");
        cmt = scan.nextLine();
        System.out.println("nhao gioi tinh:");
        gioitinh = scan.nextLine();
        System.out.println("nhap dia chi:");
        diachi = scan.nextLine();
        System.out.println("nhap dia chi thuong chu");
        dctamchu = scan.nextLine();
        System.out.println("nhap tuoi:");
        tuoi = Integer.parseInt(scan.nextLine());
    }

    public void display() {
        System.out.format("ten:%s,cmt:%s,gioitinh:%s,diachi:%s,dctamchu:%s,tuoi:%s", name, cmt, gioitinh, diachi, dctamchu, tuoi);
        switch (virut) {
            case binhthuong:
                System.out.println("binh thuong");
                break;
            case theodoi:
                System.out.println("dang theo doi");
                break;
            case benh:
                System.out.println("bi duong tinh");
                break;
        }
        if (addList.size() > 0) {
            System.out.println("lo trinh benh nhan");
            for (String add : addList) {
                System.out.println(add);
            }
        }
    }

    public void dichuyen() {
        Scanner scan = new Scanner(System.in);
        for(;;){
            System.out.println("nhap dia chi di chuyen");
            String newdiachi=scan.nextLine();
            if(!addList.contains(newdiachi)){
                addList.add(newdiachi);
            }
            System.out.println("nhap them dia chi di chuyen ko???");
            String newthao=scan.nextLine();
            if(newthao.equalsIgnoreCase("No")){
                break;
            }
        }
    }

    public thao(String name, String cmt, String gioitinh, String diachi, String dctamchu, int tuoi, thaovirut virut) {
        this.name = name;
        this.cmt = cmt;
        this.gioitinh = gioitinh;
        this.diachi = diachi;
        this.dctamchu = dctamchu;
        this.tuoi = tuoi;
        this.virut = virut;
    }

    public String getName() {
        return name;
    }

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

    public String getCmt() {
        return cmt;
    }

    public void setCmt(String cmt) {
        this.cmt = cmt;
    }

    public String getGioitinh() {
        return gioitinh;
    }

    public void setGioitinh(String gioitinh) {
        this.gioitinh = gioitinh;
    }

    public String getDiachi() {
        return diachi;
    }

    public void setDiachi(String diachi) {
        this.diachi = diachi;
    }

    public String getDctamchu() {
        return dctamchu;
    }

    public void setDctamchu(String dctamchu) {
        this.dctamchu = dctamchu;
    }

    public int getTuoi() {
        return tuoi;
    }

    public void setTuoi(int tuoi) {
        this.tuoi = tuoi;
    }

    public thaovirut getVirut() {
        return virut;
    }

    public void setVirut(thaovirut virut) {
        this.virut = virut;
    }

}

2020-03-24 13:05:24

Main:

/*
 * 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 HashMap;

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

/**
 *
 * @author Admin
 */
public class Main {
    public static void main(String[] args) {
        Map<String, Student> studentHashMap = new HashMap<>();
        
        Scanner input = new Scanner(System.in);
        int choose;
        
        do {
            showMenu();
            choose = Integer.parseInt(input.nextLine());
            
            switch(choose) {
                case 1:
                    System.out.println("Nhap N: ");
                    int n = Integer.parseInt(input.nextLine());
                    for (int i = 0; i < n; i++) {
                        Student std = new Student();
                        std.input();
                        
                        studentHashMap.put(std.getRollNo(), std);
                    }
                    break;
                case 2:
                    System.out.println("Thong tin sinh vien");
                    for (Map.Entry<String, Student> entry : studentHashMap.entrySet()) {
                        Student value = entry.getValue();
                        value.display();
                    }
                    break;
                case 3:
                    System.out.println("Nhap MSV can tim kiem: ");
                    String rollNo = input.nextLine();
                    
                    Student stdFind = studentHashMap.get(rollNo);
                    stdFind.display();
                    break;
                case 4:
                    System.out.println("Exit!!!");
                    break;
            }
        } while(choose != 4);
    }
    
    static void showMenu() {
        System.out.println("1. Nhap N sinh vien");
        System.out.println("2. In thong tin sinh vien");
        System.out.println("3. Tim kiem sinh vien theo RollNo");
        System.out.println("4. Thoat");
        System.out.println("Chon: ");
    }
}

/*
 * 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 HashMap;

import java.util.Scanner;

/**
 *
 * @author Admin
 */
public class Student {
    String name, rollNo, sex, email, address;
    int age;

    public Student() {
    }

    public Student(String name, String rollNo, String sex, String email, String address, int age) {
        this.name = name;
        this.rollNo = rollNo;
        this.sex = sex;
        this.email = email;
        this.address = address;
        this.age = age;
    }
    public void input() {
        Scanner input = new Scanner(System.in);
        System.out.println("Nhap ten: ");
        name = input.nextLine();
        
        System.out.println("Nhap MSV: ");
        rollNo = input.nextLine();
        
        System.out.println("Nhap gioi tinh: ");
        sex = input.nextLine();
        
        System.out.println("Nhap Email: ");
        email = input.nextLine();
        
        System.out.println("Nhap dia chi: ");
        address = input.nextLine();
        
        System.out.println("Nhap tuoi: ");
        age = Integer.parseInt(input.nextLine());
    }
    @Override
    public String toString() {
        return "Student{" + "name=" + name + ", rollNo=" + rollNo + ", sex=" + sex + ", email=" + email + ", address=" + address + ", age=" + age + '}';
    }
    public void display(){
        System.out.println(this);
    }
            
    public String getName() {
        return name;
    }

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

    public String getRollNo() {
        return rollNo;
    }

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

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    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;
    }

}

2020-03-23 07:26:26

Source Code

/*
 * 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.lession2.student;

import java.util.Scanner;

/**
 *
 * @author Diep.Tran
 */
public class Student {
    String name, rollNo, sex, email, address;
    int age;

    public Student() {
    }

    public Student(String name, String rollNo, String sex, String email, String address, int age) {
        this.name = name;
        this.rollNo = rollNo;
        this.sex = sex;
        this.email = email;
        this.address = address;
        this.age = age;
    }
    
    public void input() {
        Scanner input = new Scanner(System.in);
        System.out.println("Nhap ten: ");
        name = input.nextLine();
        
        System.out.println("Nhap MSV: ");
        rollNo = input.nextLine();
        
        System.out.println("Nhap gioi tinh: ");
        sex = input.nextLine();
        
        System.out.println("Nhap Email: ");
        email = input.nextLine();
        
        System.out.println("Nhap dia chi: ");
        address = input.nextLine();
        
        System.out.println("Nhap tuoi: ");
        age = Integer.parseInt(input.nextLine());
    }

    @Override
    public String toString() {
        return "Student{" + "name=" + name + ", rollNo=" + rollNo + ", sex=" + sex + ", email=" + email + ", address=" + address + ", age=" + age + '}';
    }
    
    public void display() {
//        System.out.println(toString());
        System.out.println(this);
    }

    public String getName() {
        return name;
    }

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

    public String getRollNo() {
        return rollNo;
    }

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

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    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;
    }
}

/*
 * 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.lession2.student;

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

/**
 *
 * @author Diep.Tran
 */
public class Main {
    public static void main(String[] args) {
        Map<String, Student> studentHashMap = new HashMap<>();
        
        Scanner input = new Scanner(System.in);
        int choose;
        
        do {
            showMenu();
            choose = Integer.parseInt(input.nextLine());
            
            switch(choose) {
                case 1:
                    System.out.println("Nhap N: ");
                    int n = Integer.parseInt(input.nextLine());
                    for (int i = 0; i < n; i++) {
                        Student std = new Student();
                        std.input();
                        
                        studentHashMap.put(std.getRollNo(), std);
                    }
                    break;
                case 2:
                    System.out.println("Thong tin sinh vien");
                    for (Map.Entry<String, Student> entry : studentHashMap.entrySet()) {
                        Student value = entry.getValue();
                        value.display();
                    }
                    break;
                case 3:
                    System.out.println("Nhap MSV can tim kiem: ");
                    String rollNo = input.nextLine();
                    
                    Student stdFind = studentHashMap.get(rollNo);
                    stdFind.display();
                    break;
                case 4:
                    System.out.println("Exit!!!");
                    break;
            }
        } while(choose != 4);
    }
    
    static void showMenu() {
        System.out.println("1. Nhap N sinh vien");
        System.out.println("2. In thong tin sinh vien");
        System.out.println("3. Tim kiem sinh vien theo RollNo");
        System.out.println("4. Thoat");
        System.out.println("Chon: ");
    }
}