Cannot compare two objects using instanceof

Question

When trying to compare two objects passed as arguments: first as object, second as array of objects (the same kind). Getting error Incompatible conditional operand types Room and allRooms[]. I am trying to iterate in while cycle until thisRoomType is not equals to some object from rooms. How to fix it?

public abstract class Room { ...}
public class LightRoom extends Room  {...}
public class DarkRoom extends Room {...}

Caller:

release(thisRoomType, rooms)

with parameters

private Room thisRoomType = this; // is defined in DarkRoom and LightRoom 
private Room[] rooms; // is defined in DarkRoom and LightRoom 

in method:

public synchronized void release( Room thisRoom,  Room[] allRooms) {

        try {
            int j = 0;
            while(thisRoom instanceof allRooms[j]){     
                jj++;
            }
                        int nextRoom = jj;
...
    }
}

Answer 1

Try this instead:

while (j < allRooms.length && thisRoom.getClass().equals(allRooms[j].getClass()))