Explain the difference between HashMap and TreeMap in Java
HashMap and TreeMap are both types of Map in Java. A HashMap is a collection of Key-Value pairs and the order of the keys is not significant. On the other hand, a TreeMap is a specialized map that is organized as a tree structure and requires that the key passed in must be ordered. In addition, TreeMap has an optional parameter to control the insertion of keys in the sorted order.
A HashMap is a collection of key-value pairs that is used to store and retrieve values. It is a type of data structure that uses iterators to access keys and values. A TreeMap is a specialized type of map that uses a tree structure to store and access values. It uses a Comparator to define the sort order of keys, and it allows for full customization of how keys are sorted.