java HW 5.3-5.4

Posted 2021-05-08

package com.gmail.vhrushyn;

public interface WoenCom {
	
	Student[] getRecruits();

}

package com.gmail.vhrushyn;

public class TooMuchStudentsException extends Exception {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	@Override
	public String getMessage() {
		return "ATTENTION! The group is full of students: imposible to add any more student to the group."+System.lineSeparator();
	}

}

package com.gmail.vhrushyn;

public class Student extends Person {

	private static int i = 0;
	private int id;
	private boolean scholarship;

	public Student(String firstName, String lastName, int age, boolean sex, boolean scholarship) {
		super(firstName, lastName, age, sex);
		this.scholarship = scholarship;
		id = i + 1;
		i = i + 1;
	}

	public Student() {
		super();
		id = i + 1;
		i = i + 1;
	}

	public boolean isScholarship() {
		return scholarship;
	}

	public void setScholarship(boolean scholarship) {
		this.scholarship = scholarship;
	}

	public int getId() {
		return id;
	}
	
	public void setId(int id) {
		this.id = id;
	}

	@Override
	public String toString() {
		String sScholarship = (scholarship == true) ? "yes" : "no";
		return "Student id# " + id + ", " + super.toString() + ", scholarship: " + sScholarship + System.lineSeparator()
				+ " ";
	}

}

package com.gmail.vhrushyn;

public interface SaverGroup {
	
	public void save ();
	public Groupp load ();

}

package com.gmail.vhrushyn;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintWriter;

public class SaveGroupToCSV implements SaverGroup {

	private Groupp group;
	private File file;

	public SaveGroupToCSV(Groupp group, File file) {
		super();
		this.group = group;
		this.file = file;
	}

	public SaveGroupToCSV(File file) {
		super();
		this.file = file;
	}

	public SaveGroupToCSV(Groupp group) {
		super();
		this.group = group;
	}

	public SaveGroupToCSV() {
		super();
		// TODO Auto-generated constructor stub
	}

	@Override
	public void save() {
		File file = this.file;
		if (!file.exists()) {
			try {
				file.createNewFile();
			} catch (IOException e) {
				System.out.println(e);
			}
		}
		Student[] students = group.getGroupp();

		try (PrintWriter pw = new PrintWriter(file)) {
			pw.println(group.getGrouppName());
			for (int i = 0; i < students.length; i++) {
				if (students[i] != null) {
					pw.println(students[i].getFirstName() + ";" + students[i].getLastName() + ";" + students[i].getAge()
							+ ";" + students[i].isSex() + ";" + students[i].isSex() + ";" + students[i].getId());

				}
			}
			pw.println("end");

		} catch (FileNotFoundException e) {
			System.out.println(e);
		}

	}

	@Override
	public Groupp load() {
		Groupp loadedGroup = new Groupp();
		try (BufferedReader br = new BufferedReader(new FileReader(this.file))) {
			String groupName = br.readLine();
			loadedGroup.setGrouppName(groupName);
			String[] studentText = new String[6];
			while (true) {
				
				studentText = br.readLine().split(";");
				if (studentText[0].equals("end")) {
					break;
				} else {
				
				Student student = new Student(studentText[0], studentText[1], Integer.parseInt(studentText[2]), Boolean.valueOf(studentText[3]),
						Boolean.valueOf(studentText[4]));
				student.setId(Integer.parseInt(studentText[5]));
				loadedGroup.addStudent(student);
				}
			}
		} catch (IOException e) {
			System.out.println(e);
		}

		
		return loadedGroup;
	}

}

package com.gmail.vhrushyn;

public class Person {

	private String firstName;
	private String lastName;
	private int age;
	private boolean sex;

	public Person(String firstName, String lastName, int age, boolean sex) {
		super();
		this.firstName = firstName;
		this.lastName = lastName;
		this.age = age;
		this.sex = sex;
	}

	public Person() {
		super();
	}

	public String getFirstName() {
		return firstName;
	}

	public void setFirstName(String firstName) {
		this.firstName = firstName;
	}

	public String getLastName() {
		return lastName;
	}

	public void setLastName(String lastName) {
		this.lastName = lastName;
	}

	public int getAge() {
		return age;
	}

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

	public boolean isSex() {
		return sex;
	}

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

	@Override
	public String toString() {
		String sSex = (sex == true) ? "male" : "female";
		return "last name: " + lastName + ", first name: " + firstName + ", age: " + age + ", sex: " + sSex + "";
	}
}

package com.gmail.vhrushyn;

import java.io.File;
import java.util.Arrays;

public class Main {

	public static void main(String[] args) {
		
		Groupp progGroupp = new Groupp("JavaOOP");
		
		progGroupp.addStudent(new Student("Joe", "Dreeman", 16, true, true));
		progGroupp.addStudent(new Student("Jack", "Daniels", 17, true, false));
		progGroupp.addStudent(new Student("Vicki", "Springs", 18, false, true));
		progGroupp.addStudent(new Student("Angella", "Totty", 19, false, true));
		progGroupp.addStudent(new Student("Joee", "Gods", 20, true, false));
		progGroupp.addStudent(new Student("Rob", "Key", 21, true, false));
		progGroupp.addStudent(new Student("Bob", "Alley", 22, true, true));
		progGroupp.addStudent(new Student("Tina", "Yankee", 23, false, true));
		progGroupp.addStudent(new Student("Trisha", "Zoon", 24, false, true));
		System.out.println(System.lineSeparator());
	/*	

		
//		progGroupp.addStudentManually();
		System.out.println(System.lineSeparator());
		
		System.out.println(progGroupp);
		
//		WoenCom w = progGroupp;
//		System.out.println("Recruits: "+Arrays.toString(w.getRecruits()));
		
		System.out.println(progGroupp);		
		 
		progGroupp.sortGroup("Id");		
		System.out.println(progGroupp);
		
		progGroupp.sortGroup("FirstName");		
		System.out.println(progGroupp);
		
		progGroupp.sortGroup("Age");		
		System.out.println(progGroupp);
		*/
		progGroupp.sortGroup("LastName");		
	//	System.out.println(progGroupp);
		
		System.out.println("...save and load group...");
		File file = new File("groupOne.csv");
		
		SaveGroupToCSV sgt = new SaveGroupToCSV(progGroupp, file);
		
		sgt.save();
		
		System.out.println(sgt.load());

	}

}

package com.gmail.vhrushyn;

import java.io.File;
import java.io.IOException;
import java.util.InputMismatchException;
import java.util.Scanner;

public class Groupp implements WoenCom {

	private String grouppName;
	private Student[] groupp = new Student[10];

	public Groupp(String grouppName) {
		super();
		this.grouppName = grouppName;
	}

	public Groupp() {
		super();
	}

	public String getGrouppName() {
		return grouppName;
	}

	public void setGrouppName(String grouppName) {
		this.grouppName = grouppName;
	}

	public Student[] getGroupp() {
		return groupp;
	}

	public void addStudent(Student student) {
		try {
			boolean flag = false;
			for (int i = 0; i < groupp.length; i++) {
				if (groupp[i] == null) {
					groupp[i] = student;
					flag = true;
					System.out.println("Student " + groupp[i].getLastName() + " has been added to the group.");
					break;
				}
			}
			if (!flag)
				throw new TooMuchStudentsException();
		} catch (TooMuchStudentsException e) {
			System.out.println(e.getMessage());
		}

	}

	public void addStudentManually() {
		Scanner sc = new Scanner(System.in);
			
		try {
			boolean flag = false;

			for (int i = 0; i < groupp.length; i++) {
				if (groupp[i] == null) {
					flag = true;
					System.out.println("You can add student to the group.");
					System.out.println("Enter student's first name");
		
					String firstName = sc.nextLine();
					System.out.println("Enter student's last name");
					String lastName = sc.nextLine();
					System.out.println("Enter student's age");
					int age = 0;
					try {
						age = sc.nextInt();
					} catch (InputMismatchException e) {
						System.out.println("You didn't type integer, student's age saved as '0'");
					}
			
					boolean sex = false;
					while (true) {
						String str = sc.nextLine(); // read to nowhere
						System.out.println("If student is male - type 'yes', else - 'no'");
			
						String sexS = sc.nextLine();
			
						if (sexS.equalsIgnoreCase("yes")) {
							sex = true;
							break;
						} else if (sexS.equalsIgnoreCase("no")) {
							break;
						} else {
							System.out.println("You typed wrong word, try again");
						}
					}

					boolean scholarship = false;
					while (true) {
				//		String str = sc.nextLine(); // read to nowhere
						System.out.println("If student has scholarship -  type 'yes', else - 'no'");
			
						String schS = sc.nextLine();
			
						if (schS.equalsIgnoreCase("yes")) {
							scholarship = true;
							break;
						} else if (schS.equalsIgnoreCase("no")) {
							break;
						} else {
							System.out.println("You typed wrong word, try again");
						}
					}
					System.out.println("Student's id will be defined automatically");
					groupp[i] = new Student(firstName, lastName, age, sex, scholarship);
					System.out.println("New student " + lastName + " has been addad to the group");

					break;
				}

			}

			sc.close();
	
			if (!flag)
				throw new TooMuchStudentsException();
		} catch (TooMuchStudentsException e) {
			System.out.println(e.getMessage());
		}
		
	}

	public void dellStudent(String lastName) {
		boolean flag = false;
		for (int i = 0; i < groupp.length; i++) {
			if (groupp[i] == null) {
			} else {
				if (lastName.equals(groupp[i].getLastName())) {
					groupp[i] = null;
					System.out.println("Student last name '" + lastName + "' has been deleted");
					flag = true;
				}
			}
		}
		if (!flag) {
			System.out.println("There is no such student in the group to delete");
		}
	}

	public void findStudent(String lastName) {
		boolean flag = false;
		for (int i = 0; i < groupp.length; i++) {
			if (groupp[i] == null) {
				i++;
			} else {
				if (lastName.equals(groupp[i].getLastName())) {
					System.out.println("Student found according to last name '" + lastName + "': "
							+ System.lineSeparator() + groupp[i]);
					flag = true;
				}
			}
		}
		if (!flag) {
			System.out.println("There is no such student in the group");
		}
	}

	private void sortGroup(Student[] group) {

		while (true) {
			int c = 0;
			for (int i = 0; i < group.length - 1; i++) {
				int t = 0;
				if (group[i] == null && group[i + 1] != null) {
					t = 1;
				}
				if (group[i] != null && group[i + 1] != null) {
					t = (group[i].getLastName().compareToIgnoreCase(group[i + 1].getLastName()));
				}
				if (t > 0) {
					Student tmp = group[i];
					group[i] = group[i + 1];
					group[i + 1] = tmp;
					c++;
				}

			}
			if (c == 0) {
				break;
			}
		}

	}

	private void printGroup(Student[] group) {
		int c = 0;
		for (int i = 0; i < group.length; i++) {
			if (group[i] != null) {
				c++;
				System.out.println(c + ". " + group[i]);
			} else {

			}
		}
	}

	@Override
	public String toString() {
		// sortGroup(groupp);
		System.out.println("Group '" + grouppName + "' students list:");
		printGroup(groupp);
		return " ";
	}

	@Override
	public Student[] getRecruits() {
		Student[] recruits = new Student[0];
		int j = 0;
		for (int i = 0; i < groupp.length; i++) {
			if (groupp[i] != null) {
				int age = groupp[i].getAge();
				boolean sex = groupp[i].isSex();
				if (age >= 18 && sex) {
					Student[] tmp = new Student[j + 1];
					for (int k = 0; k < recruits.length; k++) {
						tmp[k] = recruits[k];
					}
					recruits = tmp;
					recruits[j] = groupp[i];
					j++;
				}
			}
		}
		sortGroup(recruits);
		return recruits;
	}

	public void sortGroup(String arg) {
		if (arg.equalsIgnoreCase("LastName")) {
			System.out.println("Group sorted by last name");
		} else if (arg.equalsIgnoreCase("FirstName")) {
			System.out.println("Group sorted by first name");
		} else if (arg.equalsIgnoreCase("Age")) {
			System.out.println("Group sorted by age");
		} else if (arg.equalsIgnoreCase("Id")) {
			System.out.println("Group sorted by id");
		} else {
			System.out.println("wrong argument");
			return;
		}

		while (true) {
			int c = 0;
			for (int i = 0; i < groupp.length - 1; i++) {
				int t = 0;
				if (groupp[i] == null && groupp[i + 1] != null) {
					t = 1;
				}
				if (groupp[i] != null && groupp[i + 1] != null) {
					if (arg.equalsIgnoreCase("LastName")) {
						t = (groupp[i].getLastName().compareToIgnoreCase(groupp[i + 1].getLastName()));
					} else if (arg.equalsIgnoreCase("FirstName")) {
						t = (groupp[i].getFirstName().compareToIgnoreCase(groupp[i + 1].getFirstName()));
					} else if (arg.equalsIgnoreCase("Age")) {
						t = (groupp[i].getAge()) - (groupp[i + 1].getAge());
					} else if (arg.equalsIgnoreCase("Id")) {
						t = (groupp[i].getId()) - (groupp[i + 1].getId());
					}
				}
				if (t > 0) {
					Student tmp = groupp[i];
					groupp[i] = groupp[i + 1];
					groupp[i + 1] = tmp;
					c++;
				}

			}
			if (c == 0) {
				break;
			}
		}
	}
	
	static void saveToFile(String address) {
		File file = new File(address);
		try {
			file.createNewFile();
		} catch (IOException e) {
			System.out.println(e);
		}
	}

}