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- [Collections.emptyList() vs. New List Instance](https://www.baeldung.com/java-collections-emptylist-new-list)
- [Initialize a HashMap in Java](https://www.baeldung.com/java-initialize-hashmap)
- [](https://www.baeldung.com/java-hashset-arraylist-contains-performance)
- [Differences Between Collection.clear() and Collection.removeAll()](https://www.baeldung.com/java-collection-clear-vs-removeall)