Miscellany

class PathFinderThread extends Thread {	private Labyrinth myLab;	private Position myPos;	private static boolean logged = false;	private int myNumber;	public static int counter = 0;			public PathFinderThread(Labyrinth labyrinth, Position start) {		myLab = labyrinth;		myPos = start;	}			public void run() {		/*		 * log starting thread		 */		if (logged) {			myNumber = ++counter;			System.out.println("new Thread No. " + myNumber + ":");			System.out.println("Thread No. " + myNumber + " starts at ["					+ myPos.x + ", " + myPos.y + "]");		}		/*		 * find out positions in neighborhood		 */		Position[] newPos = new Position[4];		newPos[0] = new Position(myPos.x - 1, myPos.y);		newPos[1] = new Position(myPos.x + 1, myPos.y);		newPos[2] = new Position(myPos.x, myPos.y - 1);		newPos[3] = new Position(myPos.x, myPos.y + 1);		/*		 * check all four directions		 */		for (int i = 0; i < newPos.length; i++) {			if (myLab.isInsideOfLabyrinth(newPos[i])) {				switch (myLab.getElementAtPos(newPos[i])) {				/*				 * if neighbor field is free, start thread				 */				case Labyrinth.FREI:					myLab.setElementAtPos(myPos, Labyrinth.WEG);					PathFinderThread newThread = new PathFinderThread(myLab, newPos[i]);					newThread.start();					try {						newThread.join();					} catch (Exception ex) {						System.err.println("Interrupted Exception");						System.exit(-1);					}					break;				/*				 * if neighbor field is the exit, search should terminate ;)				 */				case Labyrinth.AUSGANG:					myLab.setElementAtPos(myPos, Labyrinth.WEG);					if (logged) {						System.out.println("found by thread " + myNumber);					}					myLab.print();					System.exit(0);					break;				}			}		}		/*		 * print out end of thread		 */		if (logged) {			System.out.println("Thread No. " + myNumber + " ends at ["					+ myPos.x + ", " + myPos.y + "]");		}		/*		 * delete waypoint		 */		myLab.setElementAtPos(myPos, Labyrinth.BESUCHT);	}	/**	 *  Switches logging mechanism on	 */	public static void loggingOn() {		logged = true;	}}