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CONNECT
FOUR
TOPIC 03v2 – CONNECT FOUR AI
GUIDE TO CREATING OuterRandomAI01
DESCRIPTION
In this
guide, you will create your own version of RandomAI01. Instead of choosing a random column between
0 and 6, OuterRandomAI01 chooses one of the two outer columns. So, it chooses either 0 or 6.
REFLECTION
Do you think
this AI will be better than RandomAI01?
Let’s build it and then find out!
STEP 1
In your Java Project that contains your Connect Four files, create a class
called OuterRandomAI01 and make it implement the AIAgent
interface.
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public class OuterRandomAI01
implements AIAgent
{
}
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STEP 2
You need to add the methods specified in the AIAgent
interface. To do this, you can
right-click on the OuterRandomAI01 and choose Add unimplemented methods. Remove all of the auto-generated stuff
inside the methods.
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public class OuterRandomAI01 implements AIAgent
{
@Override
public int playMove(Game
g, int playerNumber)
{
}
@Override
public String getName()
{
}
@Override
public String getWinQuote(double winPercentage)
{
}
@Override
public String getAuthor()
{
}
@Override
public void justWon()
{
}
@Override
public void justLost()
{
}
@Override
public void justTied()
{
}
}
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STEP
3
The real work goes into the playMove method but let’s
get the other six methods our of the way because they are quick to deal with.
a) In the getName() method, add the line:
return "OuterRandomAI01";
b) In the getWinQuote(double winPercentage)
method, add the line:
return "Living on
the edge!";
c) In the getAuthor() method, add the line:
return "Mr.
Campeau";
d) Leave the justWon(), justLost() and justTied() methods empty.
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public class
OuterRandomAI01 implements AIAgent
{
@Override
public
int playMove(Game
g, int playerNumber)
{
}
@Override
public String getName()
{
return "OuterRandomAI01";
}
@Override
public String getWinQuote(double winPercentage)
{
return "Living on the edge!";
}
@Override
public String getAuthor()
{
return "Mr. Campeau";
}
@Override
public
void justWon()
{
}
@Override
public
void justLost()
{
}
@Override
public
void justTied()
{
}
}
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STEP
4
We are now ready to implement the important method, playMove.
This AI will choose column 0 half of the time and column 6 the other half of
the time. Write the code to make this
happen.
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public class
OuterRandomAI01 implements AIAgent
{
@Override
public int playMove(Game g, int playerNumber)
{
if (Math.random() < 0.50)
return 0;
else
return 6;
}
@Override
public
String getName()
{
return
"OuterRandomAI01";
}
@Override
public
String getWinQuote(double winPercentage)
{
return
"Living on the edge!";
}
@Override
public
String getAuthor()
{
return
"Mr. Campeau";
}
@Override
public
void justWon()
{
}
@Override
public
void justLost()
{
}
@Override
public
void justTied()
{
}
}
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STEP
5 - TESTING
We are done creating our OuterRandomAI01 program! Already!
Now we should test it out.
a) In Tester, run a game that includes your OuterRandomAI01 agent and make it
play against a human. Analyze that is
it in fact choosing the correct columns.
b) In Tester, run a game between OuterRandomAI01 and RandomAI01.
c) In Tester, run a series between OuterRandomAI01 and RandomAI01.
STEP
6 – ANALYZE YOUR NEW AIAGENT (OPTIONAL)
Run a series of 10000 games between RandomAI01 and OuterRandomAI01. What percentage of games did
OuterRandomAI01 win? (Feel free to add
this in a comment at the top of your code like there is for the other provided
AIAgents.)
STEP
7 – CONSIDER IMPROVEMENTS
Can you think of an obvious flaw that this AIAgent
has? If you aren’t sure, just play a
few games as a human against it and just play a defensive game. You will win everytime.
If you decide to improve this code, you have to decide if you want to change
the existing one in the current class, or maybe create a new class called
OuterRandomAI02.
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