Question

I have game objects in an array collection, but they can be different classes. I can find the object by its coordinates:

Object obb = grid.getCellContent(insertObjectX, insertObjectY);

What I need to do is to find if obb.canBeSubmerged == true and then simply move it to another array.

The problem is that I canot get a property of that object “canBeSubmerged” because compilier does not know which class I used.

I wonder if there is a quicker way to do it then to go through "obb.getClass() == myClass.class" statements for each of the possible object classes.

.
.

EDIT: based on stuckless suggestion here is a working solution:

try {    
   java.lang.reflect.Field f1 = obb.getClass().getField("canBeSubmerged");
   java.lang.reflect.Field f2 = obb.getClass().getField("subObject"); 
   if (f1 != null) {       
      canBeSubmerged = f1.getBoolean(obb); 
      f2.setBoolean(obb, canBeSubmerged);
   } 
}catch (Exception e) { } 


//enter it into the submerged grid level and remove from the top grid level
if (canBeSubmerged){
    grid.removeObject(insertObjectX, insertObjectY);
    grid.putSubObjectInCell(insertObjectX, insertObjectY, obb);
}

Answer 1

If your obb object that contains the canBeSubmerged property is always of a particular class type, such as MyOBB.class, then you can do this…

if (obb instanceof MyOBB.class) {
    if (((MyOBB)obb).canBeSubmerged) {
       // do your work
    }
}

========= OR ============

Using Reflection (which will be slower)

try {
   Field f = obb.getClass().getField("canBeSubmerged");
   if (f!=null && f.getBoolean(obb)) {
      // do your work
   }
} catch (Exception e) {
}