JAVA:

In this assignment, we will be making a program to populate a game board with pieces and to

move those pieces around on the board.

Use the files Assignment.java, GameBoard.java, and GamePiece.java. All files are available on

Canvas. You will need to add header comments to each file along with comments for all the

methods you will be implementing. Do not make any other changes to the files beyond adding

comments and updating the methods described in the following instructions.

Any changes made to the main method of the file will be penalized unless otherwise

instructed

Save all files in the same folder.

Step 1.

First, you need to implement the GamePiece class in the GamePiece.java file. It should have one

instance for label (String). In addition, the following methods need to be implemented as

follows.

Method Description of the Method

public GamePiece( ) Constructs a GamePiece object by assigning the label with the default value

---.

public

GamePiece(String

newLabel)

Constructs a GamePiece object by assigning the label with the newLabel

provided.

public String

getLabel( )

Returns the instance variable label.

public String toString

( )

Constructs a String of length 3 from the label. If the label is shorter than

length 3, then the new String should be the label with spaces appended to

make it the correct length. If the label is longer than 3, then use the first 3

characters of the label.

Step 2.

You will be creating a class called GameBoard. This class should be defined in a file named "

GameBoard.java". The class GameBoard will contain a 2-dimensional array called "board" of

GamePiece objects as its instance variable. The class GameBoard must include the following

constructor and methods. (If your class does not contain any of the following methods, points

will be deducted.)

Method Description of the Method

public GameBoard(int rows, int cols) Instantiates the 2-dimensional array board to the size

rows x cols. Then instantiates each GamePiece in board

using the default constructor.

public GamePiece getPiece(int row, int

col)

Returns a GamePiece at the indexes row and seat

(specified by the parameters of this method) of the array

"board".

public boolean isSpaceValid(int row,

int col)

The method checks if the parameters row and col are

valid. If at least one of the parameters "row" or "col" is

less than 0 or larger than the last index of the array (note

that the number of rows and columns can be different),

then it returns false. Otherwise it returns true.

public boolean addPiece(int row, int

col, GamePiece piece)

This method should validate that the space specified by

row and col is valid and that the space is not occupied by a

piece. If the GamePiece at the space has the default label,

the space should be considered not occupied. If the space

is both valid and not already occupied, then the space

should replaced by the parameter piece and the method

should return true. Otherwise, return false.

public boolean movePiece(int srcRow,

int srcCol, int destRow, int destCol)

This method should validate the both the src and dest

spaces are valid and that the dest space is not occupied. If

both conditions pass, then the piece located at (srcRow,

srcCol) should be moved to (destRow, destCol). The space

at (srcRow, srcCol) should be replaced by the default

GamePiece. If this method moves the piece, return true,

otherwise return false.

public String toString( ) Returns a String representation of the board. It should

show the list of pieces placed on the board using the

toString method of the class GamePiece (it shows the first

3 characters of each piece). Use the following format:

The GameBoard

--------------------

--- Kin ---

Paw --- ---

--- --- Paw

Please see the sample output listed below.

After compiling GamePiece.java, GameBoard.java, and Assignment.java files, you need to

execute Assignment.class.

Sample Output: (the inputs entered by a user are shown in green)

Make sure that your program works at least with this scenario. You should test your code with

other scenarios as well.

C:\MyJava\applications>java Assignment

Please enter the number of rows for the GameBoard.

3

Please enter the number of columns for the GameBoard.

3

Please enter a label for a new piece. Enter "Q" when done.

Kin

Please enter a row for the piece.

0

Please enter a column for the piece.

1

New piece "Kin" added.

Please enter a label for a new piece. Enter "Q" when done.

Paw

Please enter a row for the piece.

1

Please enter a column for the piece.

0

New piece "Paw" added.

Please enter a label for a new piece. Enter "Q" when done.

Pawn

Please enter a row for the piece.

2

Please enter a column for the piece.

2

New piece "Pawn" added.

Please enter a label for a new piece. Enter "Q" when done.

Queen

Please enter a row for the piece.

4

Please enter a column for the piece.

5

Invalid row or column.

New piece "Queen" not added.

Please enter a label for a new piece. Enter "Q" when done.

King

Please enter a row for the piece.

-1

Please enter a column for the piece.

2

Invalid row or column.

New piece "King" not added.

Please enter a label for a new piece. Enter "Q" when done.

Q

--- Kin ---

Paw --- ---

--- --- Paw

Would you like to move a piece? Enter "Y" to move a piece

Y

Please enter the piece's row.

0

Please enter the piece's column.

1

Please enter the piece's new row.

0

Please enter the piece's new column.

2

Piece moved to new space.

--- --- Kin

Paw --- ---

--- --- Paw

Would you like to move a piece? Enter "Y" to move a piece

import java.util.Scanner;

public class Assignment {

/**

* main method for the assignment.

*

* This method takes input from the user to allow testing various scenarios

* for the GameBoard and GamePiece classes.

*/

public static void main(String[] args) {

// declare local variables

int row;

int col;

int destRow;

int destCol;

int rowNum;

int colNum;

GameBoard board;

GamePiece piece;

Scanner input = new Scanner(System.in);

String inputString;

// obtain board size from the user

System.out.println("Please enter the number of rows.");

rowNum = input.nextInt();

System.out.println("Please enter the number of columns.");

colNum = input.nextInt();

board = new GameBoard(rowNum, colNum);

// obtain a label for the next piece from the user

System.out.println("Please enter a label for a new piece. Enter \"Q\" when done.");

inputString = input.next();

// continue until the user indicates they are done

while (!inputString.equalsIgnoreCase("Q")) {

// create a new GamePiece from the user input

piece = new GamePiece(inputString);

// obtain a row and column to place the new piece

System.out.println("Please enter a row for the piece.");

row = input.nextInt();

System.out.println("Please enter a column for the piece.");

col = input.nextInt();

// validate the space is valid

if (board.isSpaceValid(row, col)) {

// add the piece

if (board.addPiece(row, col, piece)) {

System.out.println("New piece \"" + piece.getLabel() + "\" added.");

}

else {

System.out.println("A piece is already at that space.");

System.out.println("New piece \"" + piece.getLabel() + "\" not added.");

}

}

else {

System.out.println("Invalid row or column.");

System.out.println("New piece \"" + piece.getLabel() + "\" not added.");

}

// obtain a label for the next piece from the user

System.out.println("Please enter a label for a new piece. Enter \"Q\" when done.");

inputString = input.next();

}

// check if the user wants to move a piece

System.out.println(board.toString());

System.out.println("Would you like to move a piece? Enter \"Y\" to move a piece");

inputString = input.next();

while (inputString.equalsIgnoreCase("Y")) {

// obtain the piece's location from the user

System.out.println("Please enter the piece's row.");

row = input.nextInt();

System.out.println("Please enter the piece's column.");

col = input.nextInt();

// obtain the piece's destination from the user

System.out.println("Please enter the piece's new row.");

destRow = input.nextInt();

System.out.println("Please enter the piece's new column.");

destCol = input.nextInt();

// validate that both spaces are valid

if (board.isSpaceValid(row, col) && board.isSpaceValid(destRow, destCol)) {

// move the piece

if (board.movePiece(row, col, destRow, destCol)) {

System.out.println("Piece moved to new space.");

}

else {

System.out.println("A piece is already in that space.");

}

}

else {

System.out.println("A row or column is invalid. No piece moved.");

}

// print the current state of the board and prompt the user to continue

System.out.println(board.toString());

System.out.println("Would you like to move a piece? Enter \"Y\" to move a piece");

inputString = input.next();

}

input.close();

}

}

--------------------------------------

public class GamePiece {

// TODO add instance variable

public GamePiece() {

// TODO implement method

}

public GamePiece(String newLabel) {

// TODO implement method

}

public String getLabel() {

// TODO implement method

return "";

}

public String toString() {

// TODO implement method

return "";

}

}

-------------------------------------------------------------

public class GameBoard {

// TODO create instance variables

public GameBoard(int rows, int cols) {

// TODO implement method

}

public GamePiece getPiece(int row, int col) {

// TODO implement method

return null;

}

public boolean isSpaceValid(int row, int col) {

// TODO implement method

return false;

}

public boolean addPiece(int row, int col, GamePiece piece) {

// TODO implement method

return false;

}

public boolean movePiece(int srcRow, int srcCol, int destRow, int destCol) {

// TODO implement method

return false;

}

public String toString() {

// TODO implement method

return "";

}

}