Java TreeMap class is a red-black tree based implementation. It implements the NavigableMap interface, which in turn extends the SortedMap interface. SortedMap is an interface in the collection framework.This interface extends the Map interface and provides a total ordering of its elements (elements can be traversed in sorted order of keys). Java TreeMap class. TreeMap(SortedMap sortedMap): It also initializes a TreeMap with the entries from sortedMap, which will be sorted in the same order as sortedMap. TreeMap. The class that implements this interface is TreeMap.. TreeMap offers O(log N) lookup and insertion. TreeMap(SortedMap sm) Initializes a treemap with the entries from the SortedMap sm, which will be sorted in the same order as sm. The main characteristic of a SortedMap is that it orders the keys by their natural ordering, or by a specified comparator. TreeMap ( SortedMap < K ,? It implements the NavigableMap interface and extends AbstractMap class. The Java SortedMap interface, java.util.SortedMap, is a subtype of the java.util.Map interface, with the addition that the elements stored in a Java SortedMap map are sorted internally. This means you can iterate the elements stored in a SortedMap in the sort order.. It provides an efficient means of storing key-value pairs in sorted order. Java TreeMap is a Red-Black tree based implementation of Java's Map interface. The keys inserted into a sorted map need to implement the Comparable interface (or be accepted by the specified comparator). * If we want to represent a group of key-value pairs according to some sorting order of keys then we should go for SortedMap. Java SortedMap is a Map that further provides a total ordering on its keys. Prerequisite : HashMap and TreeMap in Java TreeMap, HashMap and LinkedHashMap: What’s Similar? On other hand HashMap implements simple Map interface and internally uses hashing for … As we have seen various overloaded constructors of a TreeMap. The TreeMap SortedMap Implementation. Keys are ordered, so if you need to iterate through the keys in sorted order, you can. Time complexity for put() and get() operation is O (log n). TreeMap implements SortedMap interface of Collection framework which is a child of Map.And internally TreeMap implements Red-Black Tree(a Self Balancing Binary Search Tree). extends V > m) Constructs a new tree map containing the same mappings and using the same ordering as the specified sorted map. TreeMap in Java, Java TreeMap class is a red-black tree based implementation. TreeMap is a SortedMap, based on Red-Black Binary Search Tree which maintains order of its elements based on given comparator or comparable. TreeMap is implemented NavigableMap whose super interface are SortedMap and Map. SortedMap * SortedMap is the child interface of Map. The most important distinction between these classes is the time guarantees and the ordering of the keys. 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