JAVA expert please help me: import java.util.ArrayList; import java.util.HashMap

Question

JAVA expert please help me:

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

public class Register {

public static void main(String[] args) {
  HashMap<Section, ArrayList<String>> 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, "peter");
  registerAStudent(roster, s4, "delco");
  registerAStudent(roster, s5, "tobias");
  registerAStudent(roster, s6, "adam");
  
  System.out.println(roster);
}

public static void registerAStudent(HashMap<Section, ArrayList<String>> roll, Section s, String student) {
  ArrayList<String> victims = roll.get(s);
  if (victims == null) {
   victims = new ArrayList<>();
   victims.add(student);
  }
  else {
   victims.add(student);
  }
  roll.put(s, victims);
}

}

Create a/chas Section% 5contain Create woks SectionA+containite follmoix4 informatio C4tautSThe r oUMUuul uUformation department (e-4., "CSS" ) courseNumber (e.g., 451 ) e-41 utrsectonNumber (c4.1 1121 ) instructor (eg., "Bob" ) · S4417 title. (ay.,"Teolato'lt-Jan' ) Use Section, objects aite keyr a/ HashMap/uite attached, Register class. Bof, Mike aalPeter shoullMKMP same Register class. Boc, Mike, and Peter should all Ce in same eduster class. ure and leter sito utthe same section. Everyone·k.cue(hint secti 0tla Everyone, eke should be uudt enem secti on s

Explanation / Answer

PROGRAM CODE:

package simple;

public class Section {

  

   private String department;

   private int courseNumber;

   private int sectionNumber;

   private String instructor;

   private String title;

  

   public Section(String department, int courseNumber, int sectionNumber, String instructor, String title) {

       this.department = department;

       this.courseNumber = courseNumber;

       this.sectionNumber = sectionNumber;

       this.instructor = instructor;

       this.title = title;

   }

   @Override

   public String toString() {

       return " Department=" + department + " CourseNumber=" + courseNumber + " SectionNumber=" + sectionNumber

               + " Instructor=" + instructor + " Title=" + title + " ";

   }

}

OUTPUT:

{

Department=CSC

CourseNumber=151

SectionNumber=1

Instructor=Bob Charlotte

Title=Intro to Java

=[bob],

Department=CSC

CourseNumber=151

SectionNumber=2

Instructor=Bob C

Title=Introduction to Java

=[delco],

Department=DBA

CourseNumber=151

SectionNumber=1

Instructor=Bob Charlotte

Title=SQL 1

=[tobias],

Department=CSC

CourseNumber=151

SectionNumber=1

Instructor=B Charlotte

Title=Java Introduction

=[peter],

Department=CSC

CourseNumber=151

SectionNumber=1

Instructor=Bob C

Title=Introduction to Java

=[mike],

Department=CSC

CourseNumber=251

SectionNumber=1

Instructor=Bob Charlotte

Title=Adv Java

=[adam]}

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