Untitled

StudentManagement std = new StudentManagement();
        std.addStudent(new Student("Nguyen Van An", "17020001", "[email protected]"));
        students[0].setGroup("K62CC");
        std.addStudent(new Student("Nguyen Van E", "17020005", "[email protected]"));
        students[1].setGroup("K62CD");
        std.addStudent(new Student("Nguyen Van C", "17020003", "[email protected]"));

        std.addStudent(new Student("Nguyen Van D", "17020004", "[email protected]"));
        std.addStudent(new Student("Nguyen Van F", "17020006", "[email protected]"));
        students[4].setGroup("K62CD");
        std.addStudent(new Student("Nguyen Van G", "17020007", "[email protected]"));
        students[5].setGroup("K62CA");
        std.addStudent(new Student("Nguyen Van H", "17020008", "[email protected]"));
        students[6].setGroup("K62CD");
        std.addStudent(new Student("Nguyen Van I", "17020009", "[email protected]"));

        std.addStudent(new Student("Nguyen Van L", "17020010", "[email protected]"));
        std.addStudent(new Student("Nguyen Van M", "17020011", "[email protected]"));
        students[8].setGroup("K62CC");
        System.out.println(std.studentsByGroup());

        //System.out.println(std.studentsByGroup());
        std.removeStudent("17020007");
        System.out.println(std.studentsByGroup());