kan ikke stoppe sorteringen

hej jeg skal have stoppet sorteringen i en ballthread koden er

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public class BallThread extends Thread {

  private BallFactory factory;
  private BallStore store;
  private BallBuffer fromBuffer;
  private BallBuffer toBuffer;
  private int ballColor;
  private boolean finished;

  public BallThread(int ballColor, BallFactory factory, BallStore store, BallBuffer fromBuffer, BallBuffer toBuffer) {
    this.ballColor = ballColor;
    this.factory = factory;
    this.store = store;
    this.fromBuffer = fromBuffer;
    this.toBuffer = toBuffer;
    finished = false;
  }

  public void run() {
    int ball;
    try {
      while (!factory.isEmpty()) {
        if (!fromBuffer.isEmpty())
          ball = fromBuffer.decreaseBuffer();
        else
          ball = factory.generate();
        if (ball == ballColor)
          store.receive(ball);
        else
          toBuffer.increaseBuffer(ball);
      }
    } catch(Exception e) {
        e.printStackTrace();
    }

  }
}
-----------------------------------------
public class Balls {

  public static final int RED  =  0;
  public static final int WHITE =  1;
  public static final int BLUE  =  2;

  public static void main(String[] args) {
    BallFactory redFactory  = new BallFactory(100);
    BallFactory whiteFactory = new BallFactory(100);
    BallFactory blueFactory  = new BallFactory(100);

    BallStore redStore  = new BallStore("RED store");
    BallStore whiteStore = new BallStore("WHITE store");
    BallStore blueStore  = new BallStore("BLUE store");

    BallBuffer rwBuffer = new BallBuffer(10);
    BallBuffer wbBuffer = new BallBuffer(10);
    BallBuffer brBuffer = new BallBuffer(10);

    BallThread redThread = new BallThread(Balls.RED, redFactory, redStore, brBuffer, rwBuffer);
    BallThread whiteThread = new BallThread(Balls.WHITE, whiteFactory, whiteStore, rwBuffer, wbBuffer);
    BallThread blueThread = new BallThread(Balls.BLUE, blueFactory, blueStore, wbBuffer, brBuffer);

    redThread.start();
    whiteThread.start();
    blueThread.start();

    try {
      while (true) {
        Thread.sleep(1000);
        redStore.print();
        blueStore.print();
        whiteStore.print();
      }
    } catch (Exception e) {
      e.printStackTrace();
    }

  }
}
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import java.util.*;

public class BallFactory {

  private int number;
  private final int maxNumber;
  private Random random;

  public BallFactory(int maxNumber) {
    this.maxNumber = maxNumber;
    number = 0;
    random = new Random();
  }

  public boolean isEmpty() {
    return (number >= maxNumber);
  }

  public int generate() {
    number ++;
    return random.nextInt(3);
  }
}
---------------------------------------------
import java.util.*;

public class BallBuffer{

  private ArrayList buffer;
  private final int size;

  public BallBuffer(int size){
    this.size = size;
    buffer = new ArrayList();
  }

  public synchronized void increaseBuffer(int value) throws InterruptedException {
    while (buffer.size() >= size)
      wait();
    buffer.add(new Integer(value));
    notifyAll();
  }

  public synchronized int decreaseBuffer() throws InterruptedException {
    while( buffer.isEmpty() )
      wait();
    int value = ((Integer) buffer.get(0)).intValue();
    buffer.remove(0);
    notifyAll();
    return value;
  }

  public synchronized boolean isEmpty() {
    return buffer.isEmpty();
  }
}
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public class BallStore {

  private int numberRed;
  private int numberWhite;
  private int numberBlue;
  private final String name;

  public BallStore(String name) {
    numberRed = 0;
    numberWhite = 0;
    numberBlue = 0;
    this.name = name;
  }

  public void receive(int x) {
    if (x == Balls.RED)
      numberRed++;
    if (x == Balls.WHITE)
      numberWhite++;
    if (x == Balls.BLUE)
      numberBlue++;
  }

  public void print() {
    System.out.println("The store named " + name + " contains:");
    System.out.println(numberRed + " red balls");
    System.out.println(numberWhite + " white balls");
    System.out.println(numberBlue + " blue balls");
    System.out.println();
  }
}
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