HashMap dans ArrayList dosent existe en dehors de la boucle

Question

J'ai une ArrayList qui contient une HashMap.

Example of one of the Arraylist lines: 
1 = {HashMap@831906200928} size = 10 
0 = {HashMap$HashMapEntry@831906220224} "0" -> "false" 
1 = {HashMap$HashMapEntry@831906220256} "1" -> "false"  
2 = {HashMap$HashMapEntry@831906220288} "2" -> "false" 
3 = {HashMap$HashMapEntry@831906220320} "3" -> "false" 
4 = {HashMap$HashMapEntry@831906220352} "4" -> "false" 
5 = {HashMap$HashMapEntry@831906220384} "5" -> "false" 
6 = {HashMap$HashMapEntry@831906220416} "6" -> "false" 
7 = {HashMap$HashMapEntry@831906220448} "7" -> "false" 
8 = {HashMap$HashMapEntry@831906220480} "8" -> "false" 
9 = {HashMap$HashMapEntry@831906220512} "9" -> "false" 

Lorsque je quitte la boucle, tous les HashMap est parti et istead, la taille ArrayList reste, mais c'est toute la liste:

iscompleted = {ArrayList@831906354944} size = 11 
0 = {HashMap@831906354968} size = 0 
1 = {HashMap@831906354968} size = 0 
2 = {HashMap@831906354968} size = 0 
3 = {HashMap@831906354968} size = 0 
4 = {HashMap@831906354968} size = 0  
5 = {HashMap@831906354968} size = 0 
6 = {HashMap@831906354968} size = 0 
7 = {HashMap@831906354968} size = 0 
8 = {HashMap@831906354968} size = 0 
9 = {HashMap@831906354968} size = 0 
10 = {HashMap@831906354968} size = 0 


>   ArrayList<HashMap<String, Boolean>> iscompleted = new ArrayList<HashMap<String, Boolean>>(); 
>   HashMap map = new HashMap<String, Object>(); 
>   for (i=0; i<_listDataHeader.size(); i++) { 
>    for (int j=1; j<_listDataChild.size(); j++){ 
>     map.put(j-1, tasks.get(x).get("isCompleted")); 
>     x++; 
>    } 
>    iscompleted.add(map); 
>    map.clear(); 
>   } 

Answer 1

Vous mettez la même instance HashMap dans la liste et vous l'effacez après chaque itération.

Vous devez créer un nouveau HashMap pour chaque élément que vous ajoutez à la liste:

 ArrayList<HashMap<String, Boolean>> iscompleted = new ArrayList<HashMap<String, Boolean>>(); 
    for (i=0; i<_listDataHeader.size(); i++) { 
     HashMap map = new HashMap<String, Object>(); 
     for (int j=1; j<_listDataChild.size(); j++){ 
      map.put(j-1, tasks.get(x).get("isCompleted")); 
      x++; 
     } 
     iscompleted.add(map); 
    }