given the following code how would I return an item

"Return an item. The user inputs the id of the requested item. If the item is not overdue, the item is being returned, the system displays a successful message; otherwise, the system displays the amount of the late fee that is due."

package EFF;

import java.util.ArrayList;

import java.util.Scanner;

import java.time.LocalDate;

import java.time.Period;

import java.util.InputMismatchException;

import java.util.Iterator;

import java.util.List;

/**

*

* @author Ferro

* @version 1

*/

public abstract class EF {

/**

* @param args the command line arguments

*/

public static void main(String[] args) {

Scanner input = new Scanner(System.in);

int choice = 0;

List list = new ArrayList();

while (true) {

displayMenu();

while (true) {

try {

choice = input.nextInt();

break;

} catch (InputMismatchException e) {

input.nextLine();

System.out.print("You must enter an integer");

}

}

switch (choice) {

case 1:

System.out.println("Enter book title: ");

input.nextLine();

String name = input.nextLine();

System.out.println("Enter book author: ");

String author = input.nextLine();

System.out.println("Enter Number of Pages: ");

int npages = -1;

while (npages == -1) {

try {

npages = input.nextInt();

} catch (InputMismatchException e) {//invalid input not numeric

System.out.println("Invalid input must be numeric ");

npages = -1;

input.nextLine();

}

}

Book b = new Book(0, name);

b.setAuthor(author);

b.setNumPages(npages);

System.out.println("Added");

System.out.println(b);

list.add(b);

break;

case 2:

System.out.print("Enter CD title: ");

input.nextLine();

String title = input.nextLine();

System.out.print("Enter CD artist: ");

String artist = input.nextLine();

System.out.print("Enter Number of Tracks: ");

int ntracks = -1;

while (ntracks == -1) {

try {

ntracks = input.nextInt();

} catch (InputMismatchException e) {

System.out.println("Invalid input must be numeric ");

ntracks = -1;

input.nextLine();

}

}

CD c = new CD(0, title);

c.setArtist(artist);

c.setNumTracks(ntracks);

System.out.println("Added");

System.out.println(c);

list.add(c);

break;

case 3:

System.out.print("Enter DVD title: ");

input.nextLine();

String movie = input.nextLine();

System.out.print("Enter DVD director: ");

String director = input.nextLine();

System.out.print("Enter duration: ");

int ntime = -1;

while (ntime == -1){

try {

ntime = input.nextInt();

} catch (InputMismatchException e) {

System.out.println("Invalid input must be numeric ");

ntime = -1;

input.nextLine();

}

}

DVD d = new DVD(0, movie);

d.setDirector(director);

d.setDuration(ntime);

System.out.println("Added");

System.out.println(d);

list.add(d);

break;

case 4:

System.out.print("Enter id: ");

int id = -1;

while (id == -1) {

try {

id = input.nextInt();

} catch (InputMismatchException e) {

System.out.println("Invalid input must be numeric ");

npages = -1;

input.nextLine();

}

}

displayItem(list, id);

break;

case 5:

break;

case 6:

break;

case 7:

break;

case 8:

break;

case 9:

System.out.println("Existing the system");

System.exit(0);

break;

default:

System.out.println("Oops Wrong Input.");

break;

}

}

}

public static void displayItem(List list, int id) {

for (Iterator iterator = list.iterator(); iterator.hasNext();){

Library next = iterator.next();

if(next.getId() == id) {

System.out.println(next);

break;

}

}

}

public static void displayMenu() {

System.out.println("Select one from the following options:");

System.out.println("1 - Add a new book ");

System.out.println("2 - Add a new CD ");

System.out.println("3 - Add a new DVD ");

System.out.println("4 - Display an item ");

System.out.println("5 - Check out an item ");

System.out.println("6 - Return an item ");

System.out.println("7 - Search for items with keyword ");

System.out.println("8 - Remove an item ");

System.out.println("9 - Quit the program ");

}

}// end of the class

//////////////////////////////////////////////////////////////////////////

package EFF;

import java.time.LocalDate;

import java.time.Period;

import java.util.ArrayList;

import java.util.List;

/**

*

* @author Ferro

*/

public abstract class Library {

private int id;

private String title;

private int dueDate;

LocalDate dateOfRent;

Period period;

private static int nextId = 1001;

public Library(int id, String title) {

this.id = id;

this.title = title;

dateOfRent = LocalDate.now();

this.period = period;

this.id = nextId;

nextId++;

}

public int getId() {

return id;

}

public String getTitle() {

return title;

}

public void setTitle(String title) {

this.title = title;

}

public LocalDate getDateOfRent() {

return dateOfRent;

}

public void setDateOfRent(LocalDate dateOfRent) {

this.dateOfRent = dateOfRent;

}

public Period getPeriod() {

return period;

}

public void setPeriod(Period period) {

this.period = period;

}

@Override

public String toString() {

return "id: " + id + ", title: " + title;

}

}