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