Java

Group

public class Group {
    private Student[] students;
    private Integer id;
    public Student getOldestStudent()
    {
        Integer maxx = 100000;
        for (int i = 0; i < students.length;i++)
        {
            Integer a = students[i];
            maxx = Integer.max(maxx, students[i]);
        }
        return ;

    }
    public boolean isEmpty()
    {

        return ;
    }

}

Student

import java.text.SimpleDateFormat;
import java.util.Date;

public class Student {
    private String lastName;
    private String firstName;
    private String secondName;
    private Integer studentId;
    private Date birthday;
    public Student(String Name, String FName, String SName, Integer Id, Date DR)
    {
        lastName = Name;
        firstName = FName;
        secondName = SName;
        studentId = Id;
        birthday = DR;
    }
    @Override
    public String toString()
    {
        SimpleDateFormat DataFormat = new SimpleDateFormat("ddMMYYYY");
        return this.lastName+" "+this.firstName+", "+this.secondName+" "+this.studentId+" "+DataFormat.format(new Date());
    }
}

Solution

import java.io.*;
import java.util.Date;

public class Solution {
    public static Student a1 = new Student("Enc", "Michail", "Vladimirovich", 8, new Date());
    public static Group[] group;
    public static void main(String[] args)
    {

        File file = new File("Group.txt");
        FileInputStream inFile = null;
        DataInputStream inData = null;


    }
}