Merge pull request #18855 from likhith5697/fix-sliding-window-optimization

Optimize SlidingWindowGatherer: remove unused finisher and always push current state

Author: lor6

core-java-modules/core-java-streams-7/src/main/java/com/baeldung/streams/gatherer/SlidingWindowGatherer.java

@@ -18,10 +18,8 @@ public Integrator<Deque<Integer>, Integer, List<Integer>> integrator() {
             @Override
             public boolean integrate(Deque<Integer> state, Integer element, Downstream<? super List<Integer>> downstream) {
                 state.addLast(element);
-                if (state.size() == 3) {
-                    downstream.push(new ArrayList<>(state));
-                    state.removeFirst();
-                }
+                downstream.push(new ArrayList<>(state));
+                state.removeFirst();
                 return true;
             }
         };