Java 8 nested for loop and conditions

Question

I am having a bit of trouble reducing this for loop into a stream in Java 8, the output from the stream does not match with the for loop

for (Object1 ob1s : getObject1s){
            if (ob1s.hasChild != null){
                map1.get(ob1holder).add(ob1s);
                if(Objects.equals(ob1.getHolder, Boolean.TRUE))
                {
                    map1.get(ob11holder).add(ob1s.getID);
                }
                if (ob1s.getObject2 != null){
                for (Object2 ob2 : ob1s.getObject2.getObjects){
                    map.get(ob2holder).add(ob2);
                }
            }
        }
}

Attempted:

getObject1s.stream()
                .filter(ob1s -> ob1s.hasChild != null)
                .map(ob1s ->
                    {map.get(ob1holder).add(ob1s);
                    if (Objects.equals(ob1.getHolder, Boolean.TRUE))
                        { map.get(ob11holder).add(ob1s.getID);}
                    return ob1s;})
                .filter(ob1s -> ob1s.getObject2 != null)
                .flatMap(ob1s -> ob1s.getObject2.getObjects.stream())
                .map(ob2 -> map.get(ob2holder).add(ob2));

Answer 1

You have no terminal operation in your stream so stream is not executed.

getObject1s.stream()
        .filter(ob1s -> ob1s.hasChild != null)
        .forEach(ob1s ->{
            map1.get(ob1holder).add(ob1s);
            if(Boolean.TRUE.equal(ob1.getHolder)){  //null safe
                map1.get(ob11holder).add(ob1s.getID);
            }
            if (ob1s.getObject2 != null){
              ob1s.getObject2.getObjects.stream()
                     .forEach(ob2 -> map.get(ob2holder).add(ob2));
            }
    })