// This file defines 4 classes...

class Thing
{
  private int x;
  private int y;

  public Thing()
  {
    x = 0;
    y = 0;
  }

  public int getX()
  {
    return x;
  }

  public int getY()
  {
    return y;
  }

  public void setX(int i)
  {
    x = i;
  }

  public void setY(int i)
  {
    y = i;
  }

  public String toString()
  {
    return "(" + x + ", " + y + ")";
  }
}
//================================================================
class ModifyX implements Runnable
{
  private Thing t;

  // Initialize the object we want to modify later in run()
  public ModifyX(Thing t)
  {
    this.t = t;
  }

  public void run()
  {
    // Let's increment the value of x
    for (int i = 0; i < 50000000; ++i)
    {
      t.setX(t.getX() + 1);
    }
  }
}
//==============================================================
class ModifyY implements Runnable
{
  private Thing t;

  // Initialize the object we want to modify later in run()
  public ModifyY(Thing t)
  {
    this.t = t;
  }

  public void run()
  {
    // Let's increment the value of y more slowly
    for (int i = 0; i < 50000000; ++i)
    {
      t.setY(t.getY() + 1);

      int wasteOfTime = t.getX() + t.getY();
    }
  }
}
//============================================================
public class Driver
{
  public static void main(String [] args)
  {
    Thing t = new Thing();
    System.out.printf("Initially, t = %s\n", t.toString());

    Thread w1 = new Thread(new ModifyX(t));
    Thread w2 = new Thread(new ModifyY(t));

    w1.start();
    w2.start();
/*
    try
    {
      w1.join();
    }
    catch (InterruptedException e)
    {
    }
*/
    for (int i = 0; i < 100; ++i)
    {
      System.out.printf("t = %s\n", t.toString());

      for (int j = 0; j < 500000; ++j)
      {
        int wasteOfTime = t.getX();
      }
    }
  }
}