gridcell.java

一个java的游戏程序

import java.util.*;

/**
 * Creates a field on the board, and keeps track of its neighbours. It also
 * sets up a new field controller. This class also keeps track of the token
 * that occupys each field, if any. When a field becomes occupied, it also sets
 * that it is the next players turn. It also sets up the winline, and cheks if
 * a move makes one of the players win.
 */
class GridCell
    extends Observable
{
    // basic data

    protected boolean _border;

    // navigation
    
    protected GridCell _neighbour[];

    /**
     * Constructor that takes a game as a parameter. It sets up an
     * array to keep track of each fields neigbours.  
     */
    public GridCell()
    {
	_neighbour = new GridCell[8];
	_border = false;
    }

    // border

    /**
     * Sets border to be true. Is set from the Board class when all the 
     * fields of
     * a board is created, the fiels that are not actually on the board is a
     * boarder field
     */
    public void setBorder()
    {
	_border = true;
    }

    /**
     * Returns true if the field is a border
     */
    public boolean isBorder()
    {
	return _border;
    }
    
    /**
     * Returns true if one of the neighbours is a border and not 
     * actually on the board
     */
    public boolean isAtRim(int direction)
    {
	return _neighbour[direction].isBorder();
    }

    // neighbours

    /**
     * Gets the neighbouring field in the direction given as parameter
     */
    public GridCell getNeighbour(int direction)
    {
	return _neighbour[direction];
    }

    /**
     * Gets the neighbouring field in the direction given as parameter
     */
    public GridCell go(Direction d)
    {
	return d.go(this);
    }
    
    /**
     * Sets the field, given as the second parameter, to be the neighbour 
     * in the direction given as the first parameter
     */
    public void setNeighbour(int direction, GridCell n)
    {
	_neighbour[direction] = n;
    }

    /**
     * Clears a cell; to be overridden by subclasses
     */
    public void clear()
    {
    }

}