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## Core Java Collections Cookbooks and Examples

### Relevant Articles: 
- [Immutable ArrayList in Java](http://www.baeldung.com/java-immutable-list)
- [Converting between an Array and a List in Java](http://www.baeldung.com/convert-array-to-list-and-list-to-array)
- [Converting between an Array and a Set in Java](http://www.baeldung.com/convert-array-to-set-and-set-to-array)
- [Converting between a List and a Set in Java](http://www.baeldung.com/convert-list-to-set-and-set-to-list)
- [Convert a Map to an Array, List or Set in Java](http://www.baeldung.com/convert-map-values-to-array-list-set)
- [Guide to the Java ArrayList](http://www.baeldung.com/java-arraylist)
- [Random List Element](http://www.baeldung.com/java-random-list-element)
- [Java - Combine Multiple Collections](http://www.baeldung.com/java-combine-multiple-collections)
- [Guide to WeakHashMap in Java](http://www.baeldung.com/java-weakhashmap)
- [Guide to the Guava BiMap](http://www.baeldung.com/guava-bimap)
- [The Java HashMap Under the Hood](http://www.baeldung.com/java-hashmap)
- [A Guide to LinkedHashMap in Java](http://www.baeldung.com/java-linked-hashmap)
- [A Guide to TreeMap in Java](http://www.baeldung.com/java-treemap)
- [Removing all nulls from a List in Java](http://www.baeldung.com/java-remove-nulls-from-list)
- [Removing all duplicates from a List in Java](http://www.baeldung.com/java-remove-duplicates-from-list)
- [Flattening Nested Collections in Java](http://www.baeldung.com/java-flatten-nested-collections)
- [HashSet and TreeSet Comparison](http://www.baeldung.com/java-hashset-vs-treeset)
- [Iterate over a Map in Java](http://www.baeldung.com/java-iterate-map)
- [Collect a Java Stream to an Immutable Collection](http://www.baeldung.com/java-stream-immutable-collection)
- [Converting a List to String in Java](http://www.baeldung.com/java-list-to-string)
- [Introduction to the Java ArrayDeque](http://www.baeldung.com/java-array-deque)
- [A Guide to HashSet in Java](http://www.baeldung.com/java-hashset)
- [A Guide to TreeSet in Java](http://www.baeldung.com/java-tree-set)
- [Java TreeMap vs HashMap](http://www.baeldung.com/java-treemap-vs-hashmap)
- [How to TDD a List Implementation in Java](http://www.baeldung.com/java-test-driven-list)
- [How to Store Duplicate Keys in a Map in Java?](http://www.baeldung.com/java-map-duplicate-keys)
- [Getting the Size of an Iterable in Java](http://www.baeldung.com/java-iterable-size)
- [Iterating Backward Through a List](http://www.baeldung.com/java-list-iterate-backwards)
- [How to Filter a Collection in Java](http://www.baeldung.com/java-collection-filtering)
- [Add Multiple Items to an Java ArrayList](http://www.baeldung.com/java-add-items-array-list)
- [Remove the First Element from a List](http://www.baeldung.com/java-remove-first-element-from-list)
- [How to Convert List to Map in Java](http://www.baeldung.com/java-list-to-map)
- [Initializing HashSet at the Time of Construction](http://www.baeldung.com/java-initialize-hashset)