public class Song {
private String title;
private String artist;
private int duration;
public Song() {
this("", "", 0, 0);
}
public Song(String t, String a, int m, int s) {
title = t;
artist = a;
duration = m * 60 + s;
}
public String getTitle() { return title; }
public String getArtist() { return artist; }
public int getDuration() { return duration; }
public int getMinutes() {
return duration / 60;
}
public int getSeconds() {
return duration % 60;
}
public String toString() {
return("\"" + title + "\" by " + artist + " " + (duration / 60) + ":" + (duration%60));
}
}
public class User {
private String userName;
private boolean online;
public User() { this(""); }
public User(String u) {
userName = u;
online = false;
}
public String getUserName() { return userName; }
public boolean isOnline() { return online; }
public String toString() {
String s = "" + userName + ": XXX songs (";
if (!online) s += "not ";
return s + "online)";
}
// Various Users for test purposes
public static User DiscoStew() {
User discoStew = new User("Disco Stew");
discoStew.addSong(new Song("Hey Jude", "The Beatles", 4, 35));
discoStew.addSong(new Song("Barbie Girl", "Aqua", 3, 54));
discoStew.addSong(new Song("Only You Can Rock Me", "UFO", 4, 59));
discoStew.addSong(new Song("Paper Soup Cats", "Jaw", 4, 18));
return discoStew;
}
public static User SleepingSam() {
User sleepingSam = new User("Sleeping Sam");
sleepingSam.addSong(new Song("Meadows", "Sleepfest", 7, 15));
sleepingSam.addSong(new Song("Calm is Good", "Waterfall", 6, 22));
return sleepingSam;
}
public static User RonnieRocker() {
User ronnieRocker = new User("Ronnie Rocker");
ronnieRocker.addSong(new Song("Rock is Cool", "Yeah", 4, 17));
ronnieRocker.addSong(new Song("My Girl is Mean to Me", "Can't Stand Up", 3, 29));
ronnieRocker.addSong(new Song("Only You Can Rock Me", "UFO", 4, 52));
ronnieRocker.addSong(new Song("We're Not Gonna Take It", "Twisted Sister", 3, 9));
return ronnieRocker;
}
public static User CountryCandy() {
User countryCandy = new User("Country Candy");
countryCandy.addSong(new Song("If I Had a Hammer", "Long Road", 4, 15));
countryCandy.addSong(new Song("My Man is a 4x4 Driver", "Ms. Lonely", 3, 7));
countryCandy.addSong(new Song("This Song is for Johnny", "Lone Wolf", 4, 22));
return countryCandy;
}
public static User PeterPunk() {
User peterPunk = new User("Peter Punk");
peterPunk.addSong(new Song("Bite My Arms Off", "Jaw", 4, 12));
peterPunk.addSong(new Song("Where's My Sweater", "The Knitters", 3, 41));
peterPunk.addSong(new Song("Is that My Toenail ?", "Clip", 4, 47));
peterPunk.addSong(new Song("Anvil Headache", "Clip", 4, 34));
peterPunk.addSong(new Song("My Hair is on Fire", "Jaw", 3, 55));
return peterPunk;
}
}
public class MusicExchangeTestProgram {
public static void main(String args[]) {
// Create a new music exchange center
MusicExchangeCenter mec = new MusicExchangeCenter();
// Create some users and give them some songs
User discoStew = User.DiscoStew();
User sleepingSam = User.SleepingSam();
User ronnieRocker = User.RonnieRocker();
User countryCandy = User.CountryCandy();
User peterPunk = User.PeterPunk();
// Register the users, except SleepingSam
discoStew.register(mec);
ronnieRocker.register(mec);
countryCandy.register(mec);
peterPunk.register(mec);
// Display the state of things before anyone logs on
System.out.println("Status: " + mec);
System.out.println("On-Line Users: " + mec.onlineUsers());
System.out.println("Available Songs: " + mec.allAvailableSongs() + "\n");
// Attempt to log on two registered users and one unregistered user
discoStew.logon(mec);
sleepingSam.logon(mec); // Should not work
ronnieRocker.logon(mec);
System.out.println("Status: " + mec);
System.out.println("On-Line Users: " + mec.onlineUsers());
System.out.println("Available Songs: " + mec.allAvailableSongs() + "\n");
// Log on two more users
countryCandy.logon(mec);
peterPunk.logon(mec);
System.out.println("Status: " + mec);
System.out.println("On-Line Users: " + mec.onlineUsers());
System.out.println("Available Songs: " + mec.allAvailableSongs());
System.out.println("Available Songs By Jaw: " +
mec.availableSongsByArtist("Jaw") + "\n");
// Log off three users (one is not even logged in)
countryCandy.logoff(mec);
discoStew.logoff(mec);
sleepingSam.logoff(mec);
System.out.println("Status: " + mec);
System.out.println("On-Line Users: " + mec.onlineUsers());
System.out.println("Available Songs: " + mec.allAvailableSongs());
System.out.println("Available Songs By Jaw: " +
mec.availableSongsByArtist("Jaw") + "\n");
// Log off the last two users
peterPunk.logoff(mec);
ronnieRocker.logoff(mec);
System.out.println("Status: " + mec);
System.out.println("On-Line Users: " + mec.onlineUsers());
System.out.println("Available Songs: " + mec.allAvailableSongs());
System.out.println("Available Songs By Jaw: " +
mec.availableSongsByArtist("Jaw") + "\n");
}
}Homework Answers
Song class:
public class Song {
private String title;
private String artist;
private int duration;
public Song() {
this("", "", 0, 0);
}
public Song(String t, String a, int m, int s) {
title = t;
artist = a;
duration = m * 60 + s;
}
public String getTitle() { return title; }
public String getArtist() { return artist; }
public int getDuration() { return duration; }
public int getMinutes() {
return duration / 60;
}
public int getSeconds() {
return duration % 60;
}
public String toString() {
return("\"" + title + "\" by " + artist + " " + (duration / 60) + ":" + (duration%60));
}
}
User class:
import java.util.ArrayList;
public class User {
private String userName;
private boolean online;
private ArrayList<Song> songList=new ArrayList<>();
public User() {
}
public User(String u,ArrayList<Song> songs) {
userName = u;
online = false;
songList=songs;
}
public String getUserName() { return userName; }
public boolean isOnline() { return online; }
public String toString() {
String s = "" + userName + ": "+this.songList.size() +"songs (";
if (!online) s += "not ";
return s + "online)";
}
public ArrayList<Song> getSongList() {
return songList;
}
public void setSongList(ArrayList<Song> songList) {
this.songList = songList;
}
// Various Users for test purposes
public static User DiscoStew() {
ArrayList<Song> sList=new ArrayList<>();
User discoStew = new User("Disco Stew",sList);
discoStew.addSong(new Song("Hey Jude", "The Beatles", 4, 35));
discoStew.addSong(new Song("Barbie Girl", "Aqua", 3, 54));
discoStew.addSong(new Song("Only You Can Rock Me", "UFO", 4, 59));
discoStew.addSong(new Song("Paper Soup Cats", "Jaw", 4, 18));
return discoStew;
}
public static User SleepingSam() {
ArrayList<Song> sList=new ArrayList<>();
User sleepingSam = new User("Sleeping Sam",sList);
sleepingSam.addSong(new Song("Meadows", "Sleepfest", 7, 15));
sleepingSam.addSong(new Song("Calm is Good", "Waterfall", 6, 22));
return sleepingSam;
}
public static User RonnieRocker() {
ArrayList<Song> sList=new ArrayList<>();
User ronnieRocker = new User("Ronnie Rocker",sList);
ronnieRocker.addSong(new Song("Rock is Cool", "Yeah", 4, 17));
ronnieRocker.addSong(new Song("My Girl is Mean to Me", "Can't Stand Up", 3, 29));
ronnieRocker.addSong(new Song("Only You Can Rock Me", "UFO", 4, 52));
ronnieRocker.addSong(new Song("We're Not Gonna Take It", "Twisted Sister", 3, 9));
return ronnieRocker;
}
public static User CountryCandy() {
ArrayList<Song> sList=new ArrayList<>();
User countryCandy = new User("Country Candy",sList);
countryCandy.addSong(new Song("If I Had a Hammer", "Long Road", 4, 15));
countryCandy.addSong(new Song("My Man is a 4x4 Driver", "Ms. Lonely", 3, 7));
countryCandy.addSong(new Song("This Song is for Johnny", "Lone Wolf", 4, 22));
return countryCandy;
}
public static User PeterPunk() {
ArrayList<Song> sList=new ArrayList<>();
User peterPunk = new User("Peter Punk",sList);
peterPunk.addSong(new Song("Bite My Arms Off", "Jaw", 4, 12));
peterPunk.addSong(new Song("Where's My Sweater", "The Knitters", 3, 41));
peterPunk.addSong(new Song("Is that My Toenail ?", "Clip", 4, 47));
peterPunk.addSong(new Song("Anvil Headache", "Clip", 4, 34));
peterPunk.addSong(new Song("My Hair is on Fire", "Jaw", 3, 55));
return peterPunk;
}
public void addSong(Song s){
this.songList.add(s);
}
public int totalSongTime(){
int time=0;
for(Song s:songList){
time+=s.getDuration();
}
return time;
}
public void register(MusicExchangeCenter m){
User u=new User();
u.userName=this.userName;
u.songList=this.songList;
u.online=this.online;
m.registerUser(u);
}
public void logon(MusicExchangeCenter m){
User u=m.usersWithName(this.getUserName());
if(u!=null){
u.online=true;
}
}
public void logoff(MusicExchangeCenter m){
User u=m.usersWithName(this.getUserName());
if(u!=null && u.isOnline()){
u.online=false;
}
}
}
Musiccenter class:
import java.util.ArrayList;
public class MusicExchangeCenter {
private ArrayList<User> userList=new ArrayList<>();
public MusicExchangeCenter() {
// TODO Auto-generated constructor stub
}
public ArrayList<User> onlineUsers(){
ArrayList<User> onlineUsersList=new ArrayList<>();
for(User u:userList){
if(u.isOnline()){
onlineUsersList.add(u);
}
}
return onlineUsersList;
}
public ArrayList<Song> allAvailableSongs(){
ArrayList<Song> allSongList=new ArrayList<>();
for(User u:userList){
if(u.isOnline()){
allSongList.addAll(u.getSongList());
}
}
return allSongList;
}
public ArrayList<Song> availableSongsByArtist(String artist){
ArrayList<Song> allSongListArtist=new ArrayList<>();
for(User u:userList){
if(u.isOnline()){
for(Song s:u.getSongList()){
if(s.getArtist().equalsIgnoreCase(artist)){
allSongListArtist.add(s);
}
}
}
}
return allSongListArtist;
}
public String toString(){
return "Music Exchange Center("+onlineUsers().size()+" clients on line,"+allAvailableSongs().size()+" songs avaialble)";
}
public User usersWithName(String s){
User user=new User();
for(User u:userList){
if(u.getUserName().equalsIgnoreCase(s)){
user=u;
break;
}
}
return user;
}
public void registerUser(User x){
User u=usersWithName(x.getUserName());
if(u.getUserName()==null){
userList.add(x);
}
}
public ArrayList<User> getUserList() {
return userList;
}
public void setUserList(ArrayList<User> userList) {
this.userList = userList;
}
}
Tester class is same
Expected output:
![Console es terminated> MusicExchangeTestProgram [Java Application]m FilesUavaljr80bin javaw.exe (Mar 22, 2018, 8:43:12 AM) ta](http://img.homeworklib.com/questions/3de037a0-25d2-11eb-a43c-154e1b311965.png?x-oss-process=image/resize,w_560)
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