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/* SimpleBoard.java */
/**
* Simple class that implements an 8x8 game board with three possible values
* for each cell: 0, 1 or 2.
*
* DO NOT CHANGE ANY PROTOTYPES IN THIS FILE.
**/
public class SimpleBoard {
private final static int DIMENSION = 8;
private int[][] grid;
/**
* Invariants:
* (1) grid.length == DIMENSION.
* (2) for all 0 <= i < DIMENSION, grid[i].length == DIMENSION.
* (3) for all 0 <= i, j < DIMENSION, grid[i][j] >= 0 and grid[i][j] <= 2.
**/
/**
* Construct a new board in which all cells are zero.
*/
public SimpleBoard() {
grid = new int[DIMENSION][DIMENSION];
}
/**
* Set the cell (x, y) in the board to the given value mod 3.
* @param value to which the element should be set (normally 0, 1, or 2).
* @param x is the x-index.
* @param y is the y-index.
* @exception ArrayIndexOutOfBoundsException is thrown if an invalid index
* is given.
**/
public void setElementAt(int x, int y, int value) {
grid[x][y] = value % 3;
if (grid[x][y] < 0) {
grid[x][y] = grid[x][y] + 3;
}
}
/**
* Get the valued stored in cell (x, y).
* @param x is the x-index.
* @param y is the y-index.
* @return the stored value (between 0 and 2).
* @exception ArrayIndexOutOfBoundsException is thrown if an invalid index
* is given.
*/
public int elementAt(int x, int y) {
return grid[x][y];
}
/**
* Returns true if "this" SimpleBoard and "board" have identical values in
* every cell.
* @param board is the second SimpleBoard.
* @return true if the boards are equal, false otherwise.
*/
public boolean equals(Object board) {
if (board.getClass() == this.getClass()) {
return (this.hashCode() == board.hashCode());
} else {
return false;
}
}
/**
* Returns a hash code for this SimpleBoard.
* @return a number between Integer.MIN_VALUE and Integer.MAX_VALUE.
*/
public int hashCode() {
int hash = 0;
for (int io=0; io<DIMENSION; io++) {
for (int ii=0; ii<DIMENSION; ii++) {
hash = hash * 3 + grid[io][ii];
}
}
return hash;
}
}
/* SimpleBoard.java */
/**
* Simple class that implements an 8x8 game board with three possible values
* for each cell: 0, 1 or 2.
*
* DO NOT CHANGE ANY PROTOTYPES IN THIS FILE.
**/
public class SimpleBoard {
private final static int DIMENSION = 8;
private int[][] grid;
/**
* Invariants:
* (1) grid.length == DIMENSION.
* (2) for all 0 <= i < DIMENSION, grid[i].length == DIMENSION.
* (3) for all 0 <= i, j < DIMENSION, grid[i][j] >= 0 and grid[i][j] <= 2.
**/
/**
* Construct a new board in which all cells are zero.
*/
public SimpleBoard() {
grid = new int[DIMENSION][DIMENSION];
}
/**
* Set the cell (x, y) in the board to the given value mod 3.
* @param value to which the element should be set (normally 0, 1, or 2).
* @param x is the x-index.
* @param y is the y-index.
* @exception ArrayIndexOutOfBoundsException is thrown if an invalid index
* is given.
**/
public void setElementAt(int x, int y, int value) {
grid[x][y] = value % 3;
if (grid[x][y] < 0) {
grid[x][y] = grid[x][y] + 3;
}
}
/**
* Get the valued stored in cell (x, y).
* @param x is the x-index.
* @param y is the y-index.
* @return the stored value (between 0 and 2).
* @exception ArrayIndexOutOfBoundsException is thrown if an invalid index
* is given.
*/
public int elementAt(int x, int y) {
return grid[x][y];
}
/**
* Returns true if "this" SimpleBoard and "board" have identical values in
* every cell.
* @param board is the second SimpleBoard.
* @return true if the boards are equal, false otherwise.
*/
public boolean equals(Object board) {
if (board.getClass() == this.getClass()) {
return (this.hashCode() == board.hashCode());
} else {
return false;
}
}
/**
* Returns a hash code for this SimpleBoard.
* @return a number between Integer.MIN_VALUE and Integer.MAX_VALUE.
*/
public int hashCode() {
int hash = 0;
for (int io=0; io<DIMENSION; io++) {
for (int ii=0; ii<DIMENSION; ii++) {
hash = hash * 3 + grid[io][ii];
}
}
return hash;
}
}
