How to make a reversi/othello game in JAVA? Ideally with multiple classes and without GUI
You are implementing a strategy board game played by two players, Black and White. It is played on an N by N board. The winner is the player who has more discs of his color than his opponent at the end of the game. This will happen when neither of the two players has a legal move or there are no spaces left on the board
Starting Position
At the beginning of the game, two black discs and two white discs are placed in the middle of the board. Black always begins, and the two players subsequently take turns moving.
Making a Move
At his turn, a player must place a disc of his color on one of the empty squares of the board, adjacent to an opponent's disc. No two matching colors are connected
vertically or horizontally so a miniature-?chequered pattern is made
The Game
Both players take it in turns to make their move which consists of placing one piece down in a legally acceptable position and then turning any of the opposing player’s pieces where applicable. A legal move is one that consists of, for example, a black piece being placed on the board that creates a straight line (vertical, horizontal or diagonal which diagonal is optional for this project) made up of a black piece at either end and only white pieces in between. When a player achieves this, they must complete the move by turning any white pieces in between the two black so that they line becomes entirely black. This turning action must be completed for every legal turning line that is created with the placing of the new piece. Players will then continue to move alternately until they get to the end of the game and a winner is decided. This decision is reached by identifying which of the two opponents has the most pieces on the board.
Different version of the Game
1. Player versus the computer (Mandatory for this project)
2. Computer versus computer (Optional for this project)
3. Player versus player (Optional for this project)
A) Draw a UML class diagram. Identify classes and the relation between them
(for example inheritance or aggregation)
B) Convert the class diagram to java classes.
Note:
• NUM_OF_PLAYERS = 2
• NUM_OF_ROW = N
• NUMBER_OF_COLUMN = N
• Color is either black “B” or “W”
** You can find a sample run at the end of this file.
Homework Answers
Program:
Sample output:
_ _ _ _
_ W B _
_ B W _
_ _ _ _
Player 1 Turn:
Enter row :
0
Enter col :
1
_ B _ _
_ B B _
_ B W _
_ _ _ _
Score: Black: 4 White: 1
Success: Black move at (0, 1)
Player 2 Turn:
_ B _ _
_ B B _
W W W _
_ _ _ _
Score: Black: 3 White: 3
Success: White move at (2, 0)
Player 1 Turn:
Enter row :
3
Enter col :
1
_ B _ _
_ B B _
W B W _
_ B _ _
Score: Black: 5 White: 2
Success: Black move at (3, 1)
Player 2 Turn:
_ B W _
_ B W _
W B W _
_ B _ _
Score: Black: 4 White: 4
Success: White move at (0, 2)
Player 1 Turn:
Enter row :
2
Enter col :
3
_ B W _
_ B W _
W B B B
_ B _ _
Score: Black: 6 White: 3
Success: Black move at (2, 3)
Player 2 Turn:
_ B W _
_ B W _
W B W B
_ B W _
Score: Black: 5 White: 5
Success: White move at (3, 2)
Player 1 Turn:
Enter row :
1
Enter col :
3
_ B W _
_ B B B
W B W B
_ B W _
Score: Black: 7 White: 4
Success: Black move at (1, 3)
Player 2 Turn:
W W W _
_ B B B
W B W B
_ B W _
Score: Black: 6 White: 6
Success: White move at (0, 0)
Player 1 Turn:
Enter row :
3
Enter col :
3
W W W _
_ B B B
W B W B
_ B B B
Score: Black: 8 White: 5
Success: Black move at (3, 3)
Game over. No further moves for White
Code to copy:
/**Disc.java**/
class Disc
{
private String color;
//Constructor
Disc(String c)
{
//Set the color of the disk
color=c;
}
//Retruns the color of the disk
String getColor()
{
return color;
}
//Set the color of the disk
void setColor(String c)
{
color=c;
}
}
/**Board.java**/
public class Board
{
Disc gameBoard[][];
int NUM_OF_ROW;
int NUM_OF_COLUMN;
//Constructor
Board(int N)
{
NUM_OF_ROW=N;
NUM_OF_COLUMN=N;
gameBoard=new Disc[NUM_OF_COLUMN][NUM_OF_COLUMN];
for(int
i=0;i {
for(int
j=0;j {
gameBoard[i][j]=new
Disc("_"); } } } //Displays the game board void printBoard() {
for(int
i=0;i {
for(int
j=0;j
{
if(!gameBoard[i][j].getColor().equals("_"))
System.out.print(gameBoard[i][j].getColor()+"
");
else
System.out.print("_ ");
}
System.out.println(""); } } //Returns true, if the board has empty(_)
squares //returns false, otherwise boolean hasEmptySquare() {
for(int
i=0;i {
for(int
j=0;j
{
//Place empty spaces on board
if(gameBoard[i][j].getColor().equals("_"))
return true;
} } return
false; } //Places Disc of given color at square [r,c] void
placeADisc(int r, int c, String
color) {
gameBoard[r][c].setColor(color); } //Returns the color of the disk placed at square
[i,j] String getDiscColor(int
i,int j) { return
gameBoard[i][j].getColor(); } } /**Player.java**/ import java.util.Scanner; class Player { private int
playerNo; private String color; int r,c; Scanner input=new
Scanner(System.in); //Constructor Player(int pn,String c) { playerNo=pn; color=c; } //Returns the color assigned to the
player String getColor() {
return color; } //Returns the row selected by the player public int
selectRow(int N) {
return r; } //Returns the column selected by the
player public int
selectColumn(int N) {
return c; } } /**HumanPlayer.java**/ class HumanPlayer extends
Player { //Constructor HumanPlayer(int pNo,String
clr) {
super(pNo,clr); } public int
selectRow(int N) { //prompt to enter
row
System.out.println("Enter row : ");
r=input.nextInt();
return r; } public int
selectColumn(int N) { //prompt to enter col
System.out.println("Enter col : ");
c=input.nextInt();
return c; } } /**ComputerPlayer.java**/ import java.util.Random; class ComputerPlayer extends
Player { Random rand=new
Random(); //Constructor ComputerPlayer(int
pNo,String clr) {
super(pNo,clr); } //Returns a randomly selected row number public int
selectRow(int N) {
r=rand.nextInt(N);
return r; } //Returns a randomly selected column
number public int
selectColumn(int N) {
c=rand.nextInt(N);
return c; } } /**Game.java**/ import java.util.Scanner; public class Game { private int
N=4; private int
NUM_OF_PLAYERS=2; private Player player[]; private Scanner input; private Board othelloBoard; boolean e,w,n,s; //boolean ne,se,sw,nw; //option part private int
er,ec,wr,wc,nr,nc,sr,sc; //int ner,nec,ser,sec,swr,swc,nwr,nwc; //optional
part int bCount=0,wCount=0; //Constructor Game() {
othelloBoard=new Board(N); player=new
Player[NUM_OF_PLAYERS]; intiBoard(); input=new
Scanner(System.in); createPlayers();
othelloBoard.printBoard(); } void createPlayers() { int
p=1; //Optional part. Remove
comments to run optional part /*
System.out.println("1.Player Vs Computer");
System.out.println("2.Computer Vs Computer");
System.out.println("3.Player Vs Player"); System.out.println("Enter
the version of the game: ");
p=input.nextInt(); */ //Default version: Player
Vs Computer
if(p==1) {
player[0]=new HumanPlayer(1,"B");
player[1]=new ComputerPlayer(2,"W"); } else
if(p==2) {
player[0]=new ComputerPlayer(1,"B");
player[1]=new ComputerPlayer(2,"W"); } else {
player[0]=new HumanPlayer(1,"B");
player[1]=new HumanPlayer(2,"W"); } } //Starts the game public
void play() { int
curPlayer=1; int
r,c; String curPlyColor="B";
System.out.println(); //Repeat the until there
are no further moves //or the game is over(board
is filled)
while(!gameOver()) {
for(int
pnum=0;pnum
{
curPlyColor=player[pnum].getColor();
if(!validMovesExist(curPlyColor))
break;
//Display whose turn it is
System.out.println("Player "+(pnum+1)+"
Turn: ");
curPlayer=pnum+1;
r=player[pnum].selectRow(N);
c=player[pnum].selectColumn(N);
while(!isLeagal(r,c,curPlyColor))
{
if(player[pnum]
instanceof HumanPlayer)
System.out.println("Invalid move!");
r=player[pnum].selectRow(N);
c=player[pnum].selectColumn(N);
}
//Make a move
makeAMove(r,c,curPlyColor);
//Update the player scores
updateCounts();
//Print the updated board and score
othelloBoard.printBoard();
System.out.println("\nScore: Black:
"+bCount+" White: "+wCount);
if(player[pnum].getColor().equals("B"))
{
System.out.println("Success: Black move
at ("+r+", "+c+")");
}
else
{
System.out.println("Success: White move
at ("+r+", "+c+")");
}
System.out.println();
}
if(!validMovesExist(curPlyColor))
{
break;
} } //If the game is over,
print that the game is over
if(gameOver()) {
System.out.println("Game over "); } //If there are no further
moves , print which //player don't have
moves else
if(!validMovesExist(curPlyColor))
{
if(curPlyColor=="B")
System.out.println("Game over. No further
moves for Black"); else
System.out.println("Game
over. No further moves for White"); } } //Updates the counts/their tiles count public void
updateCounts() { bCount=0;
for(int i=0;i {
for(int j=0;j
{
//Place empty spaces on board
if(othelloBoard.getDiscColor(i,j).equals("B"))
bCount++;
} } wCount=0;
for(int i=0;i {
for(int j=0;j
{
//Place empty spaces on board
if(othelloBoard.getDiscColor(i,j).equals("W"))
wCount++;
} } } //Initializes the game board public void
intiBoard() { int
mid=N/2;
othelloBoard.placeADisc(mid-1,mid-1,"W");
othelloBoard.placeADisc(mid-1,mid,"B");
othelloBoard.placeADisc(mid,mid-1,"B");
othelloBoard.placeADisc(mid,mid,"W"); } //Makes a move for a player public void
makeAMove(int ur, int uc,String
color) { //east
if(e==true) {
for(int j=uc;j<=ec;j++)
{
othelloBoard.placeADisc(ur,j,color);
} } //West
if(w==true) {
for(int j=uc;j>=wc;j--)
{
othelloBoard.placeADisc(ur,j,color);
} } //North
if(n==true) {
for(int i=ur;i>=nr;i--)
{
othelloBoard.placeADisc(i,uc,color);
} } //South
if(s==true) {
for(int i=ur;i<=sr;i++)
{
othelloBoard.placeADisc(i,uc,color);
} } //optional part : Remove
comments to execute optional parts /* //North-East if(ne==true) {
for(int i=ur,j=uc;i>=ner && j<=nec;i--,j++)
{
othelloBoard.placeADisc(i,j,color);
} } //South-East if(se==true) {
for(int i=ur,j=uc;i<=ser && j<=sec;i++,j++)
{
othelloBoard.placeADisc(i,j,color);
} } //South-East if(sw==true) {
for(int i=ur,j=uc;i<=swr && j>=swc;i++,j--)
{
othelloBoard.placeADisc(i,j,color);
} } //South-East if(nw==true) {
for(int i=ur,j=uc;i>=nwr && j>=nwc;i--,j--)
{
othelloBoard.placeADisc(i,j,color);
} } */ } //Returns true, if the game is over //returns false, otherwise boolean gameOver() { return
!othelloBoard.hasEmptySquare(); } //Finds whehter the location (ur,uc) is valid or
not by //checking all 8 directions from (ur,uc). //Returns true , if the (ur,uc) is the valid
move //Returns fasle, otherwise boolean
isLeagal(int ur, int uc,String
uColor) {
e=w=n=s=false; //ne=sw=nw=se=false;
optional part
if(ur>N-1 || ur<0 || uc>N-1 ||
uc<0)
{
return false; }
if(!othelloBoard.getDiscColor(ur,uc).equals("_"))
return
false;
if(uc+2<= N-1)
e=true;
if(uc-2>=0)
w=true;
if(ur-2>=0)
n=true;
if(ur+2<=N-1)
s=true; //Optional part /* if(ur-2>=0 &&
uc+2<= N-1)
ne=true; if(ur+2<=N-1 &&
uc+2<=N-1)
se=true; if(ur+2<=N-1 &&
uc-2>=0)
sw=true; if(ur-2>=0 &&
uc-2>=0)
nw=true; */
if(e!=true ||
othelloBoard.getDiscColor(ur,uc+1).equals(uColor) ||
othelloBoard.getDiscColor(ur,uc+1).equals("_"))
e=false;
if(w!=true ||
othelloBoard.getDiscColor(ur,uc-1).equals(uColor) ||
othelloBoard.getDiscColor(ur,uc-1).equals("_"))
w=false;
if(n!=true ||
othelloBoard.getDiscColor(ur-1,uc).equals(uColor) ||
othelloBoard.getDiscColor(ur-1,uc).equals("_"))
n=false;
if(s!=true ||
othelloBoard.getDiscColor(ur+1,uc).equals(uColor) ||
othelloBoard.getDiscColor(ur+1,uc).equals("_"))
s=false; //Optional part /* if(ne!=true ||
othelloBoard.getDiscColor(ur-1,uc+1).equals(uColor) ||
othelloBoard.getDiscColor(ur-1,uc+1).equals(" "))
ne=false; if(se!=true ||
othelloBoard.getDiscColor(ur+1,uc+1).equals(uColor) ||
othelloBoard.getDiscColor(ur+1,uc+1).equals(" "))
se=false; if(sw!=true ||
othelloBoard.getDiscColor(ur+1,uc-1).equals(uColor) ||
othelloBoard.getDiscColor(ur+1,uc-1).equals("
"))
sw=false; if(nw!=true ||
othelloBoard.getDiscColor(ur-1,uc-1).equals(uColor) ||
othelloBoard.getDiscColor(ur-1,uc-1).equals(" "))
nw=false; */ //E
if(e==true) {
er=ur;
for(int j=uc+2;j<=N-1;j++)
{
if(othelloBoard.getDiscColor(ur,j).equals(uColor))
{
e=true;
ec=j;
break;
}
else
{
e=false;
}
} } //W
if(w==true) {
wr=ur;
for(int j=uc-2;j>=0;j--)
{
if(othelloBoard.getDiscColor(ur,j).equals(uColor))
{
w=true;
wc=j;
break;
}
else
{
w=false;
}
} } //N
if(n==true) {
nc=uc;
for(int i=ur-2;i>=0;i--)
{
if(othelloBoard.getDiscColor(i,uc).equals(uColor))
{
n=true;
nr=i;
break;
}
else
{
n=false;
}
} } //S
if(s==true) {
sc=uc;
for(int i=ur+2;i<=N-1;i++)
{
if(othelloBoard.getDiscColor(i,uc).equals(uColor))
{
s=true;
sr=i;
break;
}
else
{
s=false;
}
} } //Optional part /* //ne if(ne==true) {
ner=ur;
nec=uc;
for(int i=ur-2,j=uc+2;i>=0 && j<=N-1;i--,j++)
{
if(othelloBoard.getDiscColor(i,j).equals(uColor))
{
ne=true;
ner=i;
nec=j;
break;
}
else
{
ne=false;
}
} } //se
if(se==true) {
ser=ur;
sec=uc;
for(int i=ur+2,j=uc+2;i<=N-1 && j<=N-1;i++,j++)
{
if(othelloBoard.getDiscColor(i,j).equals(uColor))
{
se=true;
ser=i;
sec=j;
break;
}
else
{
se=false;
}
}
}
//sw if(sw==true) {
ser=ur;
sec=uc;
for(int i=ur+2,j=uc-2;i<=N-1 && j>=0;i++,j--)
{
if(othelloBoard.getDiscColor(i,j).equals(uColor))
{
sw=true;
swr=i;
swc=j;
break;
}
else
{
sw=false;
}
} } //nw if(nw==true) {
nwr=ur;
nwc=uc;
for(int i=ur-2,j=uc-2;i>=0 && j>=0;i--,j--)
{
if(othelloBoard.getDiscColor(i,j).equals(uColor))
{
nw=true;
nwr=i;
nwc=j;
break;
}
else
{
nw=false;
}
} } */ if( e
==true || w==true ||
n==true || s==true
/*|| ne==true || se==true || sw==true || nw==true*/ ) // optiona
part
return true; else
return false; } //Retruns true, if there are further moves for //the given color. Returns false, otherwise boolean validMovesExist(String
color) { boolean
exist=false;
for(int i=0;i {
for(int j=0;j
{
if(isLeagal(i,j,color))
{
exist=true;
}
else
{
}
} } return
exist; } } /**GameStarter.java**/ public class GameStarter { public
static void main(String
args[]) { Game
g=new Game(); //Start
the game
g.play(); } } Note: To run optional parts, remove the
commants added to optional code. UML(Class diagram):
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