Java expert please help me the program below? Here is the requirement.

=====Register.java====

import java.util.ArrayList; import java.util.HashMap;

public class Register {

public static void main(String[] args) { HashMap> roster = new HashMap(); Section s1 = new Section("CSC", 151, 0001, "Bob Charlotte", "Intro to Java"); Section s2 = new Section("CSC", 151, 0001, "Bob C", "Introduction to Java"); Section s3 = new Section("CSC", 151, 0001, "B Charlotte", "Java Introduction"); Section s4 = new Section("CSC", 151, 0002, "Bob C", "Introduction to Java"); Section s5 = new Section("DBA", 151, 0001, "Bob Charlotte", "SQL 1"); Section s6 = new Section("CSC", 251, 0001, "Bob Charlotte", "Adv Java"); registerAStudent(roster, s1, "bob"); registerAStudent(roster, s2, "mike"); registerAStudent(roster, s3, "delco"); registerAStudent(roster, s4, "lassie"); registerAStudent(roster, s5, "freckles"); registerAStudent(roster, s6, "zipper"); System.out.println(roster); } public static void registerAStudent(HashMap> roll, Section s, String student) { ArrayList victims = roll.get(s); if (victims == null) { victims = new ArrayList(); victims.add(student); } else { victims.add(student); } roll.put(s, victims); }

}

Create a Section that contains met int sectonWun instructor (e.g., Bal use Section obieck as the egister ake an section. Everyone eke skou SAouyed all be uv the same