Difference between revisions of "Computer Science/61b/Homework/hw6/SimpleBoard.java"

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{{code}}
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/* SimpleBoard.java */
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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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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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*  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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*  Construct a new board in which all cells are zero.
 
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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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*  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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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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*  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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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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*  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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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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*  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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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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}
 

Revision as of 12:04, 25 April 2007

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