I need help with my java homework. The code will be below.

Enter from console the student code, and we get all the information about the student. Enter the code of the course and we get all the information about course. Write and read the information of the enrollments in file using serialized class Enrollment. Add a method in Controller that displays for each course the respective number of the students.

package com.example;

import java.util.ArrayList; import java.util.Date;

public class Controller { private static final String[] studentCode= {"s100","s200","s300"}; private static final String[] studentName= {"student1","student2","student3"}; private static final int[] studentCredit= {20,25,15}; private static final String[] courseCode= {"cs1000","cs2000","cs3000"}; private static final String[] courseName= {"Java","C++","Android"}; private static final int[] courseCredit= {4,4,3}; private static final String[] regStudentCode= {"s100","s100","s200","s200","s300","s300"}; private static final String[] regCourseCode= {"cs1000","cs2000","cs1000","cs2000","cs2000","cs3000"}; private static final String[] regDate= {"2019/1/09","2019/1/10","2019/1/15","2019/1/09","2019/1/10","2019/1/15"}; private ArrayList courses; private ArrayList students; private ArrayList enrollments; public Controller() { courses=new ArrayList(); students=new ArrayList(); enrollments=new ArrayList(); fillLists(); } private void fillLists() { for(int i=0;i Student s=new Student(studentCode[i],studentName[i], studentCredit[i]); students.add(s); } for(int i=0;i Course c=new Course(courseCode[i],courseName[i], courseCredit[i]); courses.add(c); } for(int i=0;i Student sObj=null; Course cObj=null; for(Student s: students) { if(s.getCode().equals(regStudentCode[i])) sObj=s; } for(Course c: courses) { if(c.getCode().equals(regCourseCode[i])) cObj=c; } if(sObj!=null&&cObj!=null) { Enrollment e=new Enrollment(sObj,cObj,new Date(regDate[i])); enrollments.add(e); } } } private void filStudentEnroll() { for(Student s: students) { for (Enrollment e: enrollments) { if(s.getCode().equals(e.getStudent().getCode())) s.setsEnrollments(e); } } } }