DVD$.$java and DVDCollection.java screenshots are attached here:

DVDConsoleUI.java:

import java.util.$*$;

$/**$

$*$ This class is an implementation of DVDUserInterface

$*$ that uses the console to display the menu of command choices

$*/$

public class DVDConsoleUI implements DVDUserInterface $\{$

private DVDCollection dvdlist;

private Scanner scan;

public DVDConsoleUI$($DVDCollection dl$)\{$

dvdlist $=$ dl;

scan $=$ new Scanner$($System$.$in$)$;

$\}$

public void processCommands$()$

$\{$

String$[]$ commands $=\{"$Add$/$Modify DVD$",$

"Remove DVD$",$

"Get DVDs By Rating",

"Get Total Running Time",

"Save and Exit"$\}$;

int choice;

do $\{$

for $($int i $=0$; i $$ commands.length; i$++)\{$

System.out.println$("$Select $"+$ i $+"$: $"+$ commands$[$i$])$;

$\}$

try $\{$

choice $=$ scan.nextInt$()$;

scan.nextLine$()$;

switch $($choice$)\{$

case $0$: doAddOrModifyDVD$()$; break;

case $1$: doRemoveDVD$()$; break;

case $2$: doGetDVDsByRating$()$; break;

case $3$: doGetTotalRunningTime$()$; break;

case $4$: doSave$()$; break;

default: System.out.println$("$INVALID CHOICE $-$ TRY AGAIN"$)$;

$\}$

$\}$ catch $($InputMismatchException e$)\{$

System.out.println$("$INVALID CHOICE $-$ TRY AGAIN"$)$;

scan.nextLine$()$;

choice $=-1$;

$\}$

$\}$ while $($choice $!=$ commands.length$-1)$;

$\}$

private void doAddOrModifyDVD$()\{$

$//$ Request the title

System.out.println$("$Enter title"$)$;

String title $=$ scan.nextLine$()$;

if $($title$.$equals$(""))\{$

return; $//$ input was cancelled

$\}$

title $=$ title.toUpperCase$()$;

$//$ Request the rating

System.out.println$("$Enter rating"$)$;

String rating $=$ scan.nextLine$()$;

if $($rating$.$equals$(""))\{$

return; $//$ input was cancelled

$\}$

rating $=$ rating.toUpperCase$()$;

$//$ Request the running time

System.out.println$("$Enter running time"$)$;

String time $=$ scan.nextLine$()$; $//$ NOTE: time read in as a String!

if $($time$.$equals$(""))\{$

return; $//$ input was cancelled

$\}$

$//$ Add or modify the DVD $($assuming the rating and time are valid$)$

dvdlist.addOrModifyDVD$($title$,$ rating, time$)$;

$//$ Display current collection to the console for debugging

System.out.println$("$Adding$/$Modifying: $"+$ title $+","+$ rating $+","+$ time$)$;

System.out.println$($dvdlist$)$;

$\}$

private void doRemoveDVD$()\{$

$//$ Request the title

System.out.println$("$Enter title"$)$;

String title $=$ scan.nextLine$()$;

if $($title$.$equals$(""))\{$

return; $//$ dialog was cancelled

$\}$

title $=$ title.toUpperCase$()$;

$//$ Remove the matching DVD if found

dvdlist.removeDVD$($title$)$;

$//$ Display current collection to the console for debugging

System.out.println$("$Removing: $"+$ title$)$;

System.out.println$($dvdlist$)$;

$\}$

private void doGetDVDsByRating$()\{$

$//$ Request the rating

System.out.println$("$Enter rating"$)$;

String rating $=$ scan.nextLine$()$;

if $($rating$.$equals$(""))\{$

return; $//$ dialog was cancelled

$\}$

rating $=$ rating.toUpperCase$()$;

String results $=$ dvdlist.getDVDsByRating$($rating$)$;

System.out.println$("$DVDs with rating $"+$ rating$)$;

System.out.println$($results$)$;

$\}$

private void doGetTotalRunningTime$()\{$

int total $=$ dvdlist.getTotalRunningTime$()$;

System.out.println$("$Total Running Time of DVDs: $")$;

System.out.println$($total$)$;

$\}$

private void doSave$()\{$

dvdlist.save$()$;

$\}$

$\}$

DVDManager.java:

import java.util.$*$;

$/**$

$*$ Program to display and modify a simple DVD collection

$*/$

public class DVDManager $\{$

public static void main$($String$[]$ args$)$

$\{$

DVDUserInterface dlInterface;

DVDCollection dl $=$ new DVDCollection$()$;

Scanner scan $=$ new Scanner$($System$.$in$)$;

System.out.println$("$Enter name of data file to load:"$)$;

String filename $=$ scan.nextLine$()$;

dl$.$loadData$($filename$)$;

System.out.println$("$Input interface type: C$=$Console, G$=$GUI"$)$;

String interfaceType $=$ scan.nextLine$()$;

if $($interfaceType$.$equals$("$C$"))\{$

dlInterface $=$ new DVDConsoleUI$($dl$)$;

dlInterface.processCommands$()$;

$\}$ else if $($interfaceType$.$equals$("$G$"))\{$

dlInterface $=$ new DVDGUI$($dl$)$;

dlInterface.processCommands$()$;

$\}$ else $\{$

System.out.println$("$Unrecognized interface type. Program exiting."$)$;

System.exit$(0)$;

$\}$

$\}$

$\}$

DVDUserInterface.java:

public interface DVDUserInterface

$\{$

void processCommands$()$;

$\}$