Exercises 3

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package javacore_season8_exercise3;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Scanner;

/**
 *
 * @author HuyLV
 */
public class Exercise3 {

    public static int option;
    public static Scanner scanner;
    public static ArrayList<Student> students;

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        scanner = new Scanner(System.in);
        students = new ArrayList<Student>();
        menu();
    }

    private static void menu() {
        do {
            displayMenu();
            option = scanner.nextInt();
            scanner.nextLine();
            switch (option) {
                case 1:
                    input();
                    break;
                case 2:
                    list();
                    break;
                case 3:
                    sortByYear();
                    break;
                case 4:
                    sortByGender();
                    break;
                case 5:
                    findStudentByName();
                    break;
                case 6:
                    findStudentById();
                    break;
                case 7:
                    calculateMark();
                    break;
                case 8:
                    sortByRank();
                    break;
                default:
                    break;
            }
        } while (option != 9);
        System.exit(0);
    }

    private static void displayMenu() {
        System.out.println("----------------------------Menu----------------------------");
        System.out.println("1. Nhap sinh vien.");
        System.out.println("2. Liet ke danh sach sinh vien.");
        System.out.println("3. Phan loai sinh vien theo nien khoa.");
        System.out.println("4. Phan loai sinh vien theo gioi tinh.");
        System.out.println("5. Tim kiem sinh vien theo ten.");
        System.out.println("6. Tim kiem sinh vien theo ma sinh vien.");
        System.out.println("7. Tinh diem trung binh va sap xep");
        System.out.println("8. Xep loai sinh vien theo thu hang diem trung binh.");
        System.out.println("9. Thoat.");
    }

    private static void input() {
        Student student = new Student();
        System.out.println("Hay nhap ma sinh vien: ");
        student.id = scanner.nextInt();
        scanner.nextLine();
        System.out.println("Hay nhap ten sinh vien: ");
        student.name = scanner.nextLine();
        System.out.println("Hay nhap ngay sinh: ");
        student.dob = scanner.nextLine();
        System.out.println("Hay nhap gioi tinh (nam/nu): ");
        String gen = scanner.nextLine();
        if (gen.equals("nam")) {
            student.gender = true;
        } else {
            student.gender = false;
        }
        System.out.println("Hay nhap lop: ");
        student.grade = scanner.nextLine();
        System.out.println("Hay nhap nien khoa: ");
        student.year = scanner.nextInt();
        scanner.nextLine();
        System.out.println("Hay nhap diem toan: ");
        student.markMath = scanner.nextFloat();
        System.out.println("Hay nhap diem tieng anh: ");
        student.markEn = scanner.nextFloat();
        System.out.println("Hay nhap diem van: ");
        student.markLite = scanner.nextFloat();
        students.add(student);
    }

    private static void list() {
        System.out.println("Danh sach cac sinh vien da nhap:");
        for (int i = 0; i < students.size(); i++) {
            displayStudent(students.get(i));
        }
        System.out.println();
    }

    private static void sortByYear() {
        Collections.sort(students, new Comparator<Student>() {
            @Override
            public int compare(Student o1, Student o2) {
                if (o1.year < o2.year) {
                    return -1;
                } else {
                    return 1;
                }
            }
        });
        System.out.println("Danh sach cac sinh vien phan loai theo nien khoa:");
        for (int i = 0; i < students.size(); i++) {
            String gender;
            if (students.get(i).gender) {
                gender = "Nam";
            } else {
                gender = "Nu";
            }
            System.out.println("Nien khoa: " + students.get(i).year + "\t\t"
                    + "Ma sinh vien: " + students.get(i).id + "\t\t"
                    + "Ho ten: " + students.get(i).name + "\t\t"
                    + "Ngay sinh: " + students.get(i).dob + "\t\t"
                    + "Gioi tinh: " + gender + "\t\t"
                    + "Lop: " + students.get(i).grade + "\t\t"
                    + "Diem toan: " + students.get(i).markMath + "\t\t"
                    + "Diem tieng anh: " + students.get(i).markEn + "\t\t"
                    + "Diem van: " + students.get(i).markLite + "\t\t"
            );
        }
        System.out.println();
    }

    private static void sortByGender() {
        System.out.println("Danh sach cac sinh vien phan loai theo gioi tinh:");
        ArrayList<Student> maleStudents = new ArrayList<Student>();
        ArrayList<Student> femaleStudents = new ArrayList<Student>();
        for (int i = 0; i < students.size(); i++) {
            if (students.get(i).gender) {
                maleStudents.add(students.get(i));
            } else {
                femaleStudents.add(students.get(i));
            }
        }
        System.out.println("Nu:");
        for (Student femaleStudent : femaleStudents) {
            displayStudent(femaleStudent);
        }
        System.out.println();
        System.out.println("Nam:");
        for (Student maleStudent : maleStudents) {
            displayStudent(maleStudent);
        }
        System.out.println();
    }

    private static void findStudentByName() {
        System.out.print("Hay nhap ten sinh vien ban muon tim: ");
        String name = scanner.nextLine();
        boolean isFound = false;
        int index = 0;
        for (int i = 0; i < students.size(); i++) {
            if (students.get(i).name.equals(name)) {
                isFound = true;
                index = i;
            }
        }
        if (isFound) {
            displayStudent(students.get(index));
        } else {
            System.out.println("Sinh vien ban tim khong ton tai!");
        }
    }

    private static void findStudentById() {
        System.out.print("Hay nhap ma sinh vien ban muon tim: ");
        int id = scanner.nextInt();
        boolean isFound = false;
        int index = 0;
        for (int i = 0; i < students.size(); i++) {
            if (students.get(i).id == id) {
                isFound = true;
                index = i;
            }
        }
        if (isFound) {
            displayStudent(students.get(index));
        } else {
            System.out.println("Sinh vien ban tim khong ton tai!");
        }
    }

    private static void calculateMark() {
        System.out.println("Danh sach cac sinh vien phan loai theo diem trung binh:");
        for (int i = 0; i < students.size(); i++) {
            Student student = students.get(i);
            student.markTotal = (student.markMath + student.markEn + student.markLite) / 3;
        }
        Collections.sort(students, new Comparator<Student>() {
            @Override
            public int compare(Student o1, Student o2) {
                if (o1.markTotal > o2.markTotal) {
                    return -1;
                } else {
                    return 1;
                }
            }
        });
        for (int i = 0; i < students.size(); i++) {
            displayStudentByMark(students.get(i), false);
        }
    }

    private static void sortByRank() {
        System.out.println("Danh sach cac sinh vien phan loai theo thu hang:");
        for (int i = 0; i < students.size(); i++) {
            Student student = students.get(i);
            if (student.markTotal < 5) {
                student.rank = "D";
            } else if (student.markTotal >= 5 && student.markTotal < 7) {
                student.rank = "C";
            } else if (student.markTotal >= 7 && student.markTotal < 9) {
                student.rank = "B";
            } else if (student.markTotal >= 9) {
                student.rank = "A";
            }
        }
        Collections.sort(students, new Comparator<Student>() {
            @Override
            public int compare(Student o1, Student o2) {
                if (o1.markTotal > o2.markTotal) {
                    return -1;
                } else {
                    return 1;
                }
            }
        });
        for (int i = 0; i < students.size(); i++) {
            displayStudentByMark(students.get(i), true);
        }
    }

    private static void displayStudent(Student student) {
        String gender;
        if (student.gender) {
            gender = "nam";
        } else {
            gender = "nu";
        }
        System.out.println("Ma sinh vien: " + student.id + "\t\t"
                + "Ho ten: " + student.name + "\t\t"
                + "Ngay sinh: " + student.dob + "\t\t"
                + "Gioi tinh: " + gender + "\t\t"
                + "Lop: " + student.grade + "\t\t"
                + "Nien khoa: " + student.year + "\t\t"
                + "Diem toan: " + student.markMath + "\t\t"
                + "Diem tieng anh: " + student.markEn + "\t\t"
                + "Diem van: " + student.markLite + "\t\t");
    }

    private static void displayStudentByMark(Student student, boolean isRank) {
        if (isRank) {
            String rank = "";
            switch (student.rank) {
                case "A":
                    rank = "Gioi";
                    break;
                case "B":
                    rank = "Kha";
                    break;
                case "C":
                    rank = "Trung Binh";
                    break;
                case "D":
                    rank = "Duoi Trung Binh";
                    break;
            }
            System.out.println("Ma sinh vien: " + student.id + "\t\t"
                    + "Ho ten: " + student.name + "\t\t"
                    + "Diem tong ket: " + student.markTotal
                    + "Xep loai: " + rank);
        } else {
            System.out.println("Ma sinh vien: " + student.id + "\t\t"
                    + "Ho ten: " + student.name + "\t\t"
                    + "Diem tong ket: " + student.markTotal);
        }
    }
}