Group

package com.example.whatever;

public class Group {

    private Student[] all;
    private int numStud;

    public Group(int amount) {
        all = new Student[amount];
        numStud = 0;
    }

    public void addStudent(Student student) {
        if (numStud < all.length) {
            all[numStud] = student;
            numStud++;
        }
    }
    public Student[] getAll() {
        return all;
    }

    public void setAll(Student[] all) {
        this.all = all;
    }

    public int getNumStud() {
        return numStud;
    }

    public void setNumStud(int numStud) {
        this.numStud = numStud;
    }
}