Java Question List with Map

  public List FindData(BA ba){
            IndexManager im = new IndexManager(ds);
            java.util.Map<String, Object> query = new HashMap<String, Object>();
            java.util.Map<String, Object> gt12 = new HashMap<String, Object>();
            gt12.put("$gt", 0);
            query.put("product_price", gt12);
          
            List list = new List();
            list.Initialize();
          
            QueryResult result = im.find(query);
          
            java.util.Map<String, Object>map1 = new HashMap<String, Object>();
            for (DocumentRevision revision : result) {
                Map map2 = new Map();   'B4A Map
                map2.Initialize();
                map1 = revision.getBody().asMap();   'Java.Util.Map
                for (Entry<String, Object> entry1 : map1.entrySet())
               
                {
                    map2.Put(entry1.getKey(), entry1.getValue());  
                }
                list.Add(map2);      'Add the map to a list
            }
          
            return list;
        }

(MyMap) {product_description=Step out in style in this vibrant slim fit shirt by Peter England. This pure cotton shirt features a chest pocket, full sleeves and a crisp cut-away collar. Team it with smart slim fit trousers and formal shoes to look your best., product_size=[L, XL], product_name=Green long Sleeve Shirt, product_price=1399, product_features=[{BrandFitName=F-Slim Fit, Cuffs=Regular Cuff, Collar=Regular Collar, Sleeves=Full Sleeves, Fit=Slim Fit}], category_id=1, product_image=encoded image
}

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map1 = resultlist.Get(i)
java.lang.ClassCastException: anywheresoftware.b4a.objects.collections.Map cannot be cast to anywheresoftware.b4a.objects.collections.Map$MyMap
at com.genesis.cloudantdb.main._deletedoc_click(main.java:534)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:187)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:175)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:171)
at anywheresoftware.b4a.objects.ViewWrapper$1.onClick(ViewWrapper.java:78)
at android.view.View.performClick(View.java:4764)
at android.view.View$PerformClick.run(View.java:19844)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5297)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:908)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:703)
java.lang.ClassCastException: anywheresoftware.b4a.objects.collections.Map cannot be cast to anywheresoftware.b4a.objects.collections.Map$MyMap

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Erel said:

1. List hold objects.
2. The compiler doesn't know what is the type of each object.
3. Map is a wrapper object.
4. When the compiler needs to cast an unknown object to a wrapper type it assumes that the object stored is unwrapped.
5. You need to add map2.getObject() to the list instead of map2.

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