Java - OOP - CSCU9A2

StudentAcademicHistory.java

class ModuleNotFoundException extends Exception { 
    public ModuleNotFoundException(String errorMessage) {
        super(errorMessage);
    }
}

/**
 * Write a description of class StudentAcademicHistory here.
 *
 * @author (your name)
 * @version (a version number or a date)
 */
// add module: name and code
// mark module as completed
// student's information: name, id, etc.
// update mark for module
public class StudentAcademicHistory
{
    private static final int MAX_MODULES = 10;
    
    private String studentFullName;
    private String studentId;

    private Module[] modules = new Module[MAX_MODULES];
    private int numberOfModules = 0;
    
    // ["Java and GUI"]  ["Networks"]   ["..."]
    // ["CSCU9A2"     ]  ["CSCU9AX" ]   ["..."]
    // [""]              [""        ]   ["..."]
    //  ^
    //private String[] moduleNames = new String[MAX_MODULES];
    //private String[] moduleCodes = new String[MAX_MODULES];
    //private String[] moduleGrades = new String[MAX_MODULES];
    //private boolean[] moduleCompleted = new boolean[MAX_MODULES];
    
    public StudentAcademicHistory(String name, String id) {
        studentFullName = name;
        studentId = id;
    }
    
    public void addModule(String name, String code) {
        modules[numberOfModules] = new Module(name, code);
        numberOfModules++;
    }
    
    public void addModuleGrade(String code, String grade) throws ModuleNotFoundException {
        for (int i = 0; i < numberOfModules; i++) {
            Module currentModule = modules[i];
            String currentModuleCode = currentModule.getCode();
            
            if (code.equals(currentModuleCode)) {
                currentModule.setGrade(grade);
                // currentModule is a reference to the Module object in modules[i],
                // so by calling this method here, the value of the object's attribute
                // will be updated.
                return;
            }
        }
        
        // module not found
        throw new ModuleNotFoundException(code);
    }
    
    public void printModulesInfo() {
        for (int i = 0; i < numberOfModules; i++) {
            System.out.println(modules[i]);
        }
    }
    
    public static void main(String[] args) {
        try {
            StudentAcademicHistory sah = new StudentAcademicHistory("Jane Doe", "xyz");
            sah.addModule("Java and GUI", "CSCU9A2");
            sah.addModuleGrade("CSCU9A2", "9.5");
            sah.printModulesInfo();
        } catch (ModuleNotFoundException e) {
            System.out.println(e);
        }
    }
}

/**
 * Module contains the information about a module
 * taken by a student.
 * (This should be stored in a separate file called Module.java)
 */
class Module {
    private String name;
    private String code;
    private String grade = "N/A";
    private boolean completed = false;
    
    public Module(String name, String code) {
        this.name = name;
        this.code = code;
    }
    
    public String getCode() {
        return code;
    }
    
    public void setGrade(String grade) {
        this.grade = grade;
    }
    
    public String toString() {
        return String.format("%s %s %s %b\n", name, code, grade, completed);
    }
}