java collections framework

The Treemap is a component of the Java Collections Framework that implements the SortedMap interface. It keeps its elements ordered according to the natural ordering of keys or a defined comparator.

HashMap is a component of the Java Collections Framework that implements the Map interface. It offers a key-value pair data structure in which elements are stored as a combination of keys and their corresponding values. HashMap does not support duplicate keys, but it does support mapping multiple values to the same key. It provides constant-time performance for simple operations like as element addition, removal, and retrieval.

The Java Collections Framework's LinkedHashSet is an implementation of the Set interface. It combines the advantages of LinkedList and HashSet. The order in which the elements were added to the set is the iteration order that the LinkedHashSet preserves. It offers constant-time performance for fundamental operations and disallows duplicate elements, just like HashSet.

HashSet is a Java Collections Framework class that implements the Set interface. It gives a collection with no duplicate elements and no set order for its elements. HashSet is built on a hash table data structure, which allows it to add, remove, and search for elements in constant time (O(1)).

A dynamic array implementation that is a part of the Java Collections Framework is the Vector class in Java. It offers a resizable array that can expand or contract as necessary. Similar to ArrayLists, vectors are thread-safe for use in multi-threaded situations since they are synchronised.

In Java, the ArrayList class implements the List interface as a resizable array. It offers dynamic arrays that can expand or contract in size as needed. ArrayLists are a component of the Java Collections Framework and provide a variety of methods for modifying the elements contained in them.