刪除數據和Arraylist循環

我有一個3變量（id（string），year（int），pay（double））對象我創建了一個包含對象的數組列表。刪除數據和Arraylist循環

所以現在我需要總結薪酬，如果他們有相同的ID和年份，並將其存儲在一個新的數組中！那可能嗎？

ArrayList<Earning> temp = new ArrayList(); 
ArrayList<Earning> temp = new ArrayList(); 

    double tempEarning = 0.0; 
    int count = 0; 


    for (int i = 0; i < weeklyEarnings.size(); i++) { 
     Earning e = weeklyEarnings.get(i); 
     String id = e.getId(); 
     int year = e.getYear(); 
     tempEarning = e.getEarning(); 

     Earning e2 = weeklyEarnings.get(i + 1); 

     if (id.equalsIgnoreCase(e2.getId()) && year == e2.getYear()) { 
      tempEarning += e2.getEarning(); 
     } else { 
      Earning tempEarn = new Earning(); 

      tempEarn.setEarning(tempEarning); 
      tempEarn.setId(id); 
      tempEarn.setYear(year); 

      temp.add(tempEarn); 

      count++; 


      tempEarning = 0.0; 


     } 

    } 

    weeklyEarnings.clear(); 
    weeklyEarnings = temp; 
    temp.clear();

有人可以幫我嗎？非常感謝！

來源

2012-02-13 Brian Li

試試這個：

 
HashMap<String, Earning> totalEarnings = new HashMap<String, Earning>(); 
for (Earning earning : weeklyEarnings) { 
    Earning tmpEarning = totalEarnings.get(earning.getId() + earning.getYear()); 
    if (tmpEarning == null) { 
     tmpEarning = new Earning(); 
     tmpEarning.setId(earning.getId()); 
     tmpEarning.setYear(earning.getYear()); 
     totalEarnings.put(earning.getId() + earning.getYear(), tmpEarning); 
    } 
    tmpEarning.setEarning(tmpEarning.getEarning() + earning.getEarning()); 
} 

for (Earning earning : totalEarnings.values()) 
{ 
    System.out.println(earning.getId() + ' ' + earning.getyear() + ' ' + earning.getEarning()); 
}

來源

2012-02-13 05:28:33 brettw

感謝您的幫助！ – 2012-02-13 05:54:17

你可以這樣做。

遍歷整個列表。
將列表中的每個項目與一個ID進行匹配。
如果找到匹配的「總支付」。
繼續爲列表中的每個項目。

來源

2012-02-13 05:00:17 nidhin

可以進一步推敲，因爲我完全迷失了方向，在此！謝謝！ – 2012-02-13 05:05:14

刪除數據和Arraylist循環

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