无法更改变量的增长率

Question

我有一个Class代表一个星球上的不同资源。从类实例化对象后，该对象应以恒定速率增加资源数量。生产率存储在变量中，可以更改。我希望在改变生产率之后，实际的资源生产速率也会改变。这是我的参考资料课：

public class PlanetResources implements ResourceObserver {

    //baseProducingRate;
    private final int SECONDSINHOUR =3600;
    private final int mmBaseProducingRate =20;
    private final int cBaseProducingRate = 15;
    private final int dBaseProducingRate = 13;
    private final int vBaseProducingRate = 15;


    //Amount of resources of each type
    private int metallicMicrolattice;
    private int energy;
    private int carbyne;
    private int deuterium; 
    private int vibranium;

    //Resources Producing rate
    private int mmProducingRate=this.mmBaseProducingRate;
    private int cProducingRate= this.cBaseProducingRate;
    private int dProducingRate = this.dBaseProducingRate;
    private int vProducingRate = this.vBaseProducingRate;




    public PlanetResources(int mm, int e, int c, int d, int v) {
        super();
        this.metallicMicrolattice = mm;
        this.energy = e;
        this.carbyne = c;
        this.deuterium = d;
        this.vibranium = v;

        int delay=2000;

          Timer timer = new Timer();
          timer.scheduleAtFixedRate(new TimerTask()
              {
                  public void run()
                  {
                      metallicMicrolattice++;

                  }
              }, delay, this.SECONDSINHOUR*1000/this.getMmProducingRate());


        timer.scheduleAtFixedRate(new TimerTask()
        {
            public void run()
            {
                carbyne++;
            }
        }, delay, this.SECONDSINHOUR*1000/this.cProducingRate);
}

这是我的测试代码：

public static void main(String args[]) throws InterruptedException
    {
        PlanetResources thePlanetResource = new PlanetResources(0, 0, 0, 0, 0);


        Scanner keyboard= new Scanner(System.in);
    while(true)
    {
        System.out.println("Welcome, What would you like to do ?");
        System.out.println("1) visit ship Yard");
        System.out.println("2) visit mines");
        System.out.println("3) manage fleet");
        System.out.println("4) explore galaxy");
        System.out.println("5) exit");

        int option = keyboard.nextInt();

        if (option==2)
        {
            System.out.println("Here are your current resources:");
            System.out.println(thePlanetResource);
            Thread.sleep(10000);
            System.out.println(thePlanetResource);
            thePlanetResource.setMmProducingRate(10000);

        }

    }

当我运行它时，我得到：

在提供的选项中第二次选择2（10000 /小时）后，metallicMicrollat​​ice的值应增加得更快。但是10秒钟后它仍然只产生1。