Students

DeleteStudentException.java

public class DeleteStudentException extends Exception {
    
    @Override
    public String getMessage() {
        return "Этот студент уже изгнан из группы!";
    }
    
}

Group.java

import java.util.Arrays;

/**
 *
 * @author kamaz
 */
public class Group {

    private Student[] array = new Student[10];

    public Group(Student[] array) {
        this.array = array;
    }

    public Group() {
        super();
    }

    public Student[] getArray() {
        return array;
    }

    public void setArray(Student[] array) {
        this.array = array;
    }

    public void setStudent(Student st, int index) throws GroupException, GroupExceptionTwo {
        int indexTwo = 10;
        try {
            for (int i = 0; i < array.length; i++) {
                if ((i == index) && (array[i] == null)) {
                    array[i] = st;
                    System.out.println("Место студента " + st + " в группе: " + (i + 1));
                } else if ((i == index) && (array[i] != null)) {
                    throw new GroupExceptionTwo();
                } else if (indexTwo == index && (indexTwo++) == index) {
                    throw new GroupException();
                }
            }
        } catch (GroupExceptionTwo e) {
            System.out.println(e.getMessage());
        } catch (GroupException e) {
            System.out.println(e.getMessage());
        }
    }

    public void deleteStudent(int index) throws DeleteStudentException {
        try {
            for (int i = 0; i < array.length; i++) {
                if ((i == index) && (array[i] != null)) {
                    array[i] = null;
                    System.out.println("Студент с места: " + (i + 1) + " изгнан из группы");
                } else if ((i == index) && (array[i] == null)) {
                    throw new DeleteStudentException();
                }
            }
        } catch (DeleteStudentException e) {
            System.out.println(e.getMessage());
        }
    }

    public int countStudentInGroup() {
        int count = 0;
        for (int i = 0; i < array.length; i++) {
            if (array[i] != null) {
                count++;
            }
        }
        return count;
    }

    public String foundStudent(int index) {
        String n = null;
        for (int i = 0; i < array.length; i++) {
            if ((array[i] != null) && (i == index)) {
                n = array[i].getSurname();
            }
        }
        return n;
    }

    @Override
    public String toString() {
        int j = 0;
        String[] arraySurname = new String[countStudentInGroup()];
        for (int i = 0; i < array.length; i++) {
            if (array[i] != null) {
                arraySurname[j] = array[i].getSurname();
                j++;

            }
        }
        Arrays.sort(arraySurname);
        return "Group: " + Arrays.toString(arraySurname);
    }

}

GroupException.java

public class GroupException extends Exception {
    
    @Override
    public String getMessage() {
        return "В этой группе больше студентов не может быть!";
    }
    
}

GroupExceptionTwo.java

public class GroupExceptionTwo extends Exception {
    
    @Override
    public String getMessage() {
        return "Это место в группе уже занято!";
    }
    
}

Human.java

public class Human {
    
    private String name;
    private String surname;
    private String surnameTwo;
    private int age;
    private boolean sex;

    public Human(String name, String surname, String surnameTwo, int age, boolean sex) {
        this.name = name;
        this.surname = surname;
        this.surnameTwo = surnameTwo;
        this.age = age;
        this.sex = sex;
    }
    
    public Human() {
        super();
    }

    public String getName() {
        return name;
    }

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

    public String getSurname() {
        return surname;
    }

    public void setSurname(String surname) {
        this.surname = surname;
    }

    public String getSurnameTwo() {
        return surnameTwo;
    }

    public void setSurnameTwo(String surnameTwo) {
        this.surnameTwo = surnameTwo;
    }

    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() {
        return "Human {" + " name = " + name + '}';
    }
    
}

Main.java

public class Main {
    
    public static void main(String[] args) throws GroupException, GroupExceptionTwo, DeleteStudentException {
        
        Student one = new Student("Ivan", "Petrov", "Vasilievich", 18, true);
        Student two = new Student("Anna", "Petrova", "Igorevna", 38, false);
        Student three = new Student("Olia", "Vetrova", "Pavlovna", 21, false);
        Student four = new Student("Igor", "Shvedenko", "Rostyslavovych", 19, true);
        Student five = new Student("Roman", "Kryvobok", "Valerievich", 25, true);
        Student six = new Student("Kostiantyn", "Khalyk", "Stepanovych", 31, true);
        Student seven = new Student("Tatyana", "Bigun", "Oleksandrovna", 26, false);
        Student eight = new Student("Anastasia", "Isachenko", "Valentinovna", 25, false);
        Student nine = new Student("Viacheslav", "Zhyzhula", "Olegovych", 34, true);
        Student ten = new Student("Kamila", "Tanchyk", "Kostiantynovna", 21, false);
        Student eleven = new Student("Misha", "Bogatyriov", "Ivanovych", 30, true);
        Student twelve = new Student("Oksana", "Fedorinenko", "Bogdanovna", 30, false);
        
        Group a = new Group();
        
        a.setStudent(one, 0);
        a.setStudent(two, 1);
        a.setStudent(three, 2);
        a.setStudent(four, 3);
        a.setStudent(five, 4);
        a.setStudent(six, 5);
        a.setStudent(seven, 6);
        a.setStudent(eight, 7);
        a.setStudent(nine, 8);
        a.setStudent(ten, 9);
        a.setStudent(eleven, 10);
        a.setStudent(twelve, 9);
        System.out.println("-------------");
        System.out.println(a);
        System.out.println("-------------");
        
        System.out.println(a.foundStudent(9));
        System.out.println("-------------");

        a.deleteStudent(0);
//        a.deleteStudent(0);
        a.deleteStudent(2);
//        a.deleteStudent(2);
        System.out.println(a);
    }
    
}

Student.java

public class Student extends Human {

    public Student(String name, String surname, String surnameTwo, int age, boolean sex) {
        super(name, surname, surnameTwo, age, sex);
    }
    
    public Student() {
        super();
    }

    @Override
    public String toString() {
        return super.toString(); //To change body of generated methods, choose Tools | Templates.
    }

    @Override
    public void setSex(boolean sex) {
        super.setSex(sex); //To change body of generated methods, choose Tools | Templates.
    }

    @Override
    public boolean isSex() {
        return super.isSex(); //To change body of generated methods, choose Tools | Templates.
    }

    @Override
    public void setAge(int age) {
        super.setAge(age); //To change body of generated methods, choose Tools | Templates.
    }

    @Override
    public int getAge() {
        return super.getAge(); //To change body of generated methods, choose Tools | Templates.
    }

    @Override
    public void setSurnameTwo(String surnameTwo) {
        super.setSurnameTwo(surnameTwo); //To change body of generated methods, choose Tools | Templates.
    }

    @Override
    public String getSurnameTwo() {
        return super.getSurnameTwo(); //To change body of generated methods, choose Tools | Templates.
    }

    @Override
    public void setSurname(String surname) {
        super.setSurname(surname); //To change body of generated methods, choose Tools | Templates.
    }

    @Override
    public String getSurname() {
        return super.getSurname(); //To change body of generated methods, choose Tools | Templates.
    }

    @Override
    public void setName(String name) {
        super.setName(name); //To change body of generated methods, choose Tools | Templates.
    }

    @Override
    public String getName() {
        return super.getName(); //To change body of generated methods, choose Tools | Templates.
    }
    
}