java - Method performance on Android -

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i have method should find number of appearances of following words combination in array. method re-written in java c# code i've made performs 50 times slower makes me think don't know in java internals translate it.

this java code:

 private map<string, long> weightwords(map<sentence, long> wordswithweight) {      map<string, long> newwordswithweight = new hashmap();     (map.entry<sentence, long> item : wordswithweight.entryset()) {          string title = item.getkey().gettitle().tolowercase();         string[] split = title.split("-");         string goodname = title.replace(split[0].trim() + " - ", "");         if (title.contains(split[0].trim() + " - ")) {             goodname = title.replace(split[0].trim() + " - ", "");         } else if (title.contains(split[0].trim() + "- ")) {             goodname = title.replace(split[0].trim() + "- ", "");         }          string[] strings = goodname.split(" ");         string fullstring = "";          (string s : strings) {             if (!s.isempty()) {                 fullstring += s + " ";                 string currentstring = fullstring.trim();                 long counter = 0l;                 (map.entry<sentence, long> wordentry : wordswithweight.entryset()) {                     {                         if (wordentry.getkey().gettitle().tolowercase().trim().contains(currentstring))                             counter++;                     }                 }                 if (!newwordswithweight.containskey(s))                     newwordswithweight.put(s, counter);             }         }     }     return utils.sortbyvalue(newwordswithweight); }

in code run n*n on same entry set named 'wordswithweight', , on each iteration call tolowercase() , trim(). can prepare entry set before , remove tolowercase() , trim() calls on each iteration.this should increase performance.


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