Java: LinkedHashMaps overlaps over themselves -

-

i want create copy of linked hash map , want remove values (from list) instead of first entry. here got:

linkedhashmap<string, list<value>> facetsincategoriescopy = new linkedhashmap<>(facetsincategories);  if (!facets.equals("something")) {     (list<value> value : facetsincategoriescopy.values()) {         if (value.size() > 1) {             int nbrofelements = value.size();             (int = nbrofelements-1; > 0; i--) {                 value.remove(i);             }         }     } }

after operation turns out facetsincategories modified too. why? , how solve issue? appreciated.

i don't have 50 reputation add comment. see answer assigning hashmap hashmap

essentially, copy constructor used make new map has references mutable objects i.e. facetsincategories , update when update facetsincategoriescopy map.

the solution instead deep copy instead. have added test code below, used string instead of value

  //test https://stackoverflow.com/questions/27324315/   public static void teststacko_q_27324315() {      map<string, list<string>> facetsincategories = new linkedhashmap<string, list<string>>();     string[] values = new string[]{"test1", "test2", "test3"};     list<string> valueslist = new arraylist<string>(arrays.aslist(values));     facetsincategories.put("test", valueslist);      map temp = collections.unmodifiablemap(facetsincategories);     linkedhashmap<string, list<string>> facetsincategoriescopy = (linkedhashmap<string, list<string>>)deepcopy(temp);      string facets = "test_me";      if (!facets.equals("something")) {         (list<string> value : facetsincategoriescopy.values()) {             if (value.size() > 1) {                 int nbrofelements = value.size();                 (int = nbrofelements-1; > 0; i--) {                     value.remove(i);                 }             }         }     }      system.out.println(facetsincategories);     system.out.println(facetsincategoriescopy); }  public static <k1, k2, v> map<k1, list<v>> deepcopy(       map<k1, list<v>> original){        map<k1, list<v>> copy = new linkedhashmap<k1, list<v>>();       for(map.entry<k1, list<v>> entry : original.entryset()){           copy.put(entry.getkey(), new arraylist<v>(entry.getvalue()));       }       return copy;   }

Comments

Post a Comment

Popular posts from this blog

python - mat is not a numerical tuple : openCV error -

-
i have write down code showing error ma not getting it: please help: showing mat not numerical tuple: import cv import cv2 capture = cv2.videocapture("j.3gp") while(1): _, frame1 = capture.read() grayimage1 = cv2.cvtcolor(frame1, cv2.color_bgr2gray) _, frame2 = capture.read() grayimage2 = cv2.cvtcolor(frame2, cv2.color_bgr2gray) differenceimage = cv2.absdiff(grayimage1,grayimage2) thresholdimage = cv2.threshold(differenceimage,25,255,cv2.thresh_binary) cv2.imshow("difference image", differenceimage) cv2.imshow("threshold image", thresholdimage) cv2.imshow("image", frame1) k = cv2.waitkey(30) & 0xff error arising : ----------------------------------------------------------------------------------------- traceback (most recent call last): file "desk.py", line 15, in <module> cv2.imshow("threshold image", thresholdimage) typeerror: mat not numerical tuple ...
Read more

c# - MSAA finds controls UI Automation doesn't -

-
i'm working on automating windows application. i'm using teststack white framework. i've hit problem. program has 'window' object cannot see inside of. white shows no controls inside of it. inspect.exe shows no controls inside of either when running in ui automation mode. if switch inspect msaa see controls inside fine. there anyway me use msaa c# handle on these controls? if can identify msaa functions need, can use p/invoke call them c#. here's example article doing msaa: http://www.codeproject.com/articles/38906/ui-automation-using-microsoft-active-accessibility also, pinvoke.net can used identify iaccessible (msaa) functions: http://www.pinvoke.net/search.aspx?search=iaccessible&namespace=[all] here's answer along lines: msaa com-based? finally, alternative p/invoke, might able use tlbimp.exe create wrapper assembly oleacc.dll, , access msaa functions through it. i'm not sure if works msaa, it's worth try. as e...
Read more

wordpress - .htaccess: RewriteRule: bad flag delimiters -

-
pulling hair out on one. have following .htaccess file custom redirects in addition wordpress's default settings. when tested on local wamp server worked fine after moving production i'm not getting rewriterule: bad flag delimiters error in server log , after while site goes down internal server error any appreciated. in advance! <ifmodule mod_rewrite.c> rewriteengine on rewritebase / rewriterule ^rockford_weddings___welcome\.html$ /wedding/ [r=301,l] rewriterule ^blog/?$ /journal/ [r=301,l] rewriterule ^blog/(.*)$ /$1 [r=301,l] rewriterule ^portraitinvestment/?$ /portraitinvestment\.pdf [r=301,l] rewriterule ^weddinginvestment/?$ /weddinginvestment\.pdf [r=301,l] rewriterule ^holidaycards2014/?$ /holidaycards2014\.pdf [r=301,l] </ifmodule> # begin wordpress <ifmodule mod_rewrite.c> rewriteengine on rewritebase / rewriterule ^index\.php$ - [l] rewritecond %{request_filename} !-f rewritecond %{request_filename} !-d rewriterule . /index.php [l] </...
Read more