Each Student is identified by a unique number $($ID$).$ Some students may not yet have score

values, and their scores may be updated later. The application also supports student groups, where

different attributes can be used to assemble students.

The Student class represents a Student having the following three attributes:

A$.$ ID: Identification of the student, $($ii$)$ name: Name of the student, $($iii$)$ score: The score

of the student. If no score value is provided, a value of $-1\mathrm{.}0$ is used. There are two

constructors in the class. One takes all attributes specified by the parameters. The other

uses only the parameters' ID and name attributes, and its score value is $-1\mathrm{.}0,$ indicating

that this student has not yet been assigned a score or the score will be assigned later.

The withScore method creates a new Student instance with this Student's ID and name

and the supplied new score value.

B$.$ A group of students is represented by the StudentGroup class. The constructor produces

an instance with the specified capacity, which is the maximum number of students the

instance may record. The addStudents function is used to add students to a

StudentGroup. The score value of a certain Student can be updated by calling the

updateStudent method, which employs some method defined by the Student class.

C$.$ An Exception IllegalStateException is thrown when a new student object is tried to put

in StudentGroup where the capacity is exceeded. This exception is also thrown when

updateStudent method is called but no student is matched with the existing ids.