TreeMap in Java

What is TreeMap It is a Red-Black tree based NavigableMap implementation. Like HashMap it contains only unique elements. Unlike HashMap it cannot have null key but like HashMap it can have multiple null values. The map is sorted according to the natural ordering (ascending order) of its keys, or by a Comparator provided at map […]

Read More

LinkedHashMap in Java

What is LinkedHashMap A LinkedHashMap like HashMap is a simple yet powerful way to store and get data. Unlike HashMap, LinkedHashMap is based on HashTable and Linked list implementation of the Map interface and stores items as key/value pairs. Like HashMap, LinkedHashMap permits only unique keys. It also permits only one null key (whereas HashTable […]

Read More