Read through the code of the class Player, noting it has two instance variables, name and rank, which are of type String and three further instance variables won, drew and lost which are of type int....
Read through the code of the class Player, noting it has two instance variables, name and rank, which are of type String and three further instance variables won, drew and lost which are of type int. There is also an attribute of the class, points, which does not have a corresponding instance variable. Also note the constructor and methods of the class and what they do.
TournamentAdmin class code:
public class RankAdmin
{
/**
* Constructor for objects of class RankAdmin
*/
public RankAdmin()
{
}
}
Player class code:
public class Player
{
private String name;
private String rank;
private int won;
private int drew;
private int lost;
/**
* Constructor for objects of class Player
*/
public Player(String aName, String aRank)
{
name = aName;
rank = aRank;
// no need to set won, drew and lost to 0
}
/**
* getter for attribute points
*/
public int getPoints()
{
return won + drew;
}
/**
* getter for name
*/
public String getName()
{
return name;
}
/**
* getter for rank
*/
public String getRank()
{
return rank;
}
/**
* getter for won
*/
public int getWon()
{
return won;
}
/**
* getter for drew
*/
public int getDrew()
{
return drew;
}
/**
* getter for lost
*/
public int getLost()
{
return lost;
}
/**
* increments the number of games won
*/
public void incWon()
{
won = won + 1;
}
/**
* increments the number of games drawn
*/
public void incDrew()
{
drew = drew + 1;
}
/**
* increments the number of games lost
*/
public void incLost()
{
lost = lost + 1;
}
/**
* setter for rank
*/
public void setRank(String aRank)
{
rank = aRank;
}
public String toString()
{
return ("Player " + name + ", rank: " + rank + " stats: Won: " + won
+ ", drew: " + drew + ", lost: " + lost + ", points: " + getPoints());
}
}
A.
In this part of the question you will amend the TournamentAdmin class.
i.
An instance of TournamentAdmin is used to hold data about a number of players in a number of different ranks. For example:
|
Key |
Value |
|
"Master" |
List of Player objects in the Master rank |
|
" Intermediate" |
List of Player objects in the Intermediate rank |
|
" Beginner" |
List of Player objects in the Beginner rank |
|
... |
Declare a private instance variable players in your TournamentAdmin class, capable of referencing a map where the key is a String and the value is a List of Player objects as in the example above.
ii.
Next amend the provided zero-argument constructor in TournamentAdmin so that players is assigned a suitable empty map object when a new instance of TournamentAdmin is created.
iii.
Write a public instance method for the TournamentAdmin class called addPlayer(), which takes two arguments and returns no value as in the following header:
public void addPlayer(String rank, Player player)
The method should check to see if a list for that rank already exists in the Player map.
If the list exists, then the new Player should be added to the existing list of players for that rank.
If the list does not exist, then a new empty list of Player should be created and the new Player should be added to it, then a new key-value pair should be created in players with Tournament as the key and the new list as the value.
B.
Write a public instance method for the TournamentAdmin class called recordResult() which takes five arguments and returns no value as below:
public void recordResult(String rank, String playerA, String playerB, int playerAScore, int playerBScore)
rank indicates which rank the result is for, playerA and playerB indicate which players faced each other. playerAScore and playerBScore are the number of points each player scored in the game.
You should begin by declaring a local variable of a type suitable for referencing a list of Players. Then you should get the list of players for that tournament from the players map, using rank as the map key, and assign it to your local variable.
If playerA scored more points than playerB, then increment the number of wins for playerA , and increment the number of losses for playerB. Similarly, if playerB scored more points than playerA, then increment the number of wins for playerB , and increment the number of losses for playerA. If playerA and playerB both scored the same number of points, then increment the number of draws for both playerA and playerB.
Homework Answers
Screenshot
-----------------------------------------------
Player.java
public class Player
{
private String name;
private String rank;
private int won;
private int drew;
private int lost;
/**
* Constructor for objects of class Player
*/
public Player(String aName, String aRank)
{
name = aName;
rank = aRank;
// no need to set won, drew and lost to 0
}
/**
* getter for attribute points
*/
public int getPoints()
{
return won + drew;
}
/**
* getter for name
*/
public String getName()
{
return name;
}
/**
* getter for rank
*/
public String getRank()
{
return rank;
}
/**
* getter for won
*/
public int getWon()
{
return won;
}
/**
* getter for drew
*/
public int getDrew()
{
return drew;
}
/**
* getter for lost
*/
public int getLost()
{
return lost;
}
/**
* increments the number of games won
*/
public void incWon()
{
won = won + 1;
}
/**
* increments the number of games drawn
*/
public void incDrew()
{
drew = drew + 1;
}
/**
* increments the number of games lost
*/
public void incLost()
{
lost = lost + 1;
}
/**
* setter for rank
*/
public void setRank(String aRank)
{
rank = aRank;
}
public String toString()
{
return ("Player " + name + ", rank: " + rank + " stats: Won: " + won
+ ", drew: " + drew + ", lost: " + lost + ", points: " + getPoints());
}
RankAdmin.java
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
public class RankAdmin {
//Instance variable
ArrayList<Player> players;
private Map<String,ArrayList<Player>>
playersMap;
/**
* Constructor for objects of class RankAdmin
*/
public RankAdmin()
{
playersMap=new
HashMap<String,ArrayList<Player>>();
}
/*
* check to see if a list for
that rank already exists in the Player map
* If the list exists, then
the new Player should be added to the existing list of players for
that rank.
* Else new Player should be
added to it,
* then a new key-value pair
should be created in players with Tournament as the key and the new
list as the value.
*/
public void addPlayer(String rank,
Player player) {
if(
playersMap.containsKey(rank)) {
players=playersMap.get(rank);
players.add(player);
playersMap.put(rank, players);
}
else {
players=new ArrayList<Player>();
players.add(player);
playersMap.put(rank, players);
}
}
/*
*
*/
public void recordResult(String
rank, String playerA, String playerB, int playerAScore, int
playerBScore) {
players=new
ArrayList<Player>();
players=playersMap.get(rank);
int index1 =
0,index2 = 0;
for(int
i=0;i<players.size();i++) {
if(players.get(i).getName().equals(playerA))
{
index1=i;
}
else
if(players.get(i).getName().equals(playerB)) {
index2=i;
}
}
if(playerAScore>playerBScore) {
players.get(index1).incWon();
players.get(index2).incLost();
}
else
if(playerAScore<playerBScore) {
players.get(index1).incLost();
players.get(index2).incWon();
}
if(playerAScore==playerBScore) {
players.get(index1).incDrew();
players.get(index2).incDrew();
}
}
}
TestPlayer.java
public class TestPlayer {
public static void main(String[] args) {
//Create object of rankAdmin
RankAdmin ra=new RankAdmin();
//Create 2 players
Player player1=new
Player("Michael","Master");
Player player2=new
Player("Britany","Master");
//Add into map
ra.addPlayer("Master",player1);
ra.addPlayer("Master",player2);
//Display intial status
System.out.println("Initial
status:");
System.out.println(player1);
System.out.println(player2);
System.out.println("\nAfter play
status:");
ra.recordResult("Master",
player1.getName(),player2.getName(), 10, 12);
System.out.println(player1);
System.out.println(player2);
}
}
-----------------------------------------------
Output
Initial status:
Player Michael, rank: Master stats: Won: 0, drew: 0, lost: 0,
points: 0
Player Britany, rank: Master stats: Won: 0, drew: 0, lost: 0,
points: 0
After play status:
Player Michael, rank: Master stats: Won: 0, drew: 0, lost: 1,
points: 0
Player Britany, rank: Master stats: Won: 1, drew: 0, lost: 0,
points: 1
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