PSO的健身功能在我的代碼中不起作用？

Question

我有一個Android Studio項目，它使用羣體粒子算法優化移動資源。我一直在我的健身功能中遇到這個錯誤，我的主要活動從未運行或因此顯示出結果。這是我的課，我不斷獲取問題...

public class CustomService implements Goodness { 


public static int numOfServices = MainActivity.servicenames.size(); 
public static final int NUM_DIMENSIONS = 1 + numOfServices; 
public static HashMap<String, Integer> serviceMap = new HashMap<String, Integer>(); //hashmap to store values 
ArrayList<String> serviceNames = MainActivity.servicenames; 
ArrayList<Double> costData = MainActivity.costDATA; 
ArrayList<Double> costWlan = MainActivity.costWLAN; 
ArrayList<Double> costUtilities = MainActivity.costUTILITY; 
double batteryCost; 

public void setBatteryCost(double batteryCost) { 
    this.batteryCost = batteryCost; 
} 

public CustomService(double batteryCost, ArrayList<Double> costData, ArrayList<Double> costWlan, 
        ArrayList<Double> costUtilities) { 
    if (costUtilities == null || costUtilities.size() < 1 || costData.size() < 1 || costWlan.size() < 1) { 
     throw new RuntimeException("Please add atleast 1 cost to Data, WLAN and Utility"); 
    } 
    this.batteryCost = batteryCost; //make sure you add battery field to UI, user enters battery level 
    this.costData = costData; 
    this.costWlan = costWlan; 
    this.costUtilities = costUtilities; 
} 


public double getGoodness(boolean[] bits) { 
    double utility = 0.0; 
    double rcost = 0.0; 
    ArrayList<Double> resourceCost = new ArrayList<Double>(); 
    Collections.sort(costUtilities); 
    double maxValue = Collections.max(costUtilities); 
    int NumOfDimensions = serviceMap.size(); 
    serviceMap.put("DATA", 0); 
    serviceMap.put("WLAN", 1); 
    int data = serviceMap.get("DATA"); 
    int wlan = serviceMap.get("WLAN"); 
    for (int i = 2; i <= NumOfDimensions; i++) { //hashmap that stores the service names with a bit value i 
     for (int k = 0; k < numOfServices; k++) { 
      serviceMap.put(serviceNames.get(k), i); //if i = 2, k = 1, put(2, Facebook), put(3, Twitter) 
     } 

     if (bits[data] && bits[wlan]) { 
      return -500; 
     } 
     if (!bits[data] || bits[wlan]) { 
      return -1000; //particle goodness always returns this?? 
     } 
     if (bits[data]) { 
      resourceCost = costData; 
     } else if (bits[wlan]) { 
      resourceCost = costWlan; 
     } 


     for (int n = 2; n <= numOfServices; n++) { 
      if (bits[serviceMap.get(n)]) { 
       utility += costUtilities.get(n - 1); 
       rcost += resourceCost.get(n - 1); 
      } 
     } 
     if (rcost < batteryCost) { 
      return utility; 
     } 
    } 
     return utility * 0.50; 
    } 

} 

基本上，我實現了一個HashMap是需要從主活動的用戶輸入，並分配這些輸入與被用作位的int值bits []數組。這是我的錯誤...

Caused by: java.lang.ArrayIndexOutOfBoundsException: length=0; index=0 
        at test_classes.CustomService.getGoodness(CustomService.java:60) 
        at bpso.BinaryPso.optimize(BinaryPso.java:45) 
        at android_tests.CustomUseCase.test(CustomUseCase.java:56) 
        at ai69.psoui.ParticleActivity.runTest(ParticleActivity.java:108) 
        at ai69.psoui.ParticleActivity$runTests.doInBackground(ParticleActivity.java:59) 
        at ai69.psoui.ParticleActivity$runTests.doInBackground(ParticleActivity.java:56) 
        at android.os.AsyncTask$2.call(AsyncTask.java:295) 
        at java.util.concurrent.FutureTask.run(FutureTask.java:237) 
        at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234) 

Answer 1

在我看來，你要使用的bits數組作爲輸入/輸出參數。但是，創建後無法更改數組的大小。所以，你有幾種選擇：

1）確保陣列具有傳遞時，它的尺寸爲serviceNames相同

2）使用一個對象，可以調整（如BitSet或List<Boolean>）。而不是陣列。

3）創建所述陣列內部getGoodness和返回具有double和所創建的bits陣列的getGoodness返回值的複合值。