Difference Between Map And Hashmap Java
distinguishing map and hashmap in Java
Difference Between Map And Hashmap Java
In Java, a map is a collection interface that stores key-value pairs, allowing you to retrieve values based on their corresponding keys. HashMap is one of the classes that implement the map interface, providing a way to store and retrieve key-value pairs efficiently. The main difference between map and hashmap in Java is that map is an interface that defines key-value mapping, while hashmap is a specific implementation of the map interface that uses a hash table to store key-value pairs. HashMap allows for fast retrieval of values based on keys and does not guarantee the order in which elements are stored. Additionally, hashmap allows null values and keys, while some other map implementations may have restrictions on null values or keys.
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1 - Map Interface:
The Map interface in Java represents a key value pair mapping where each key is unique.
It is an interface and does not provide concrete implementations.
Common implementations of the Map interface are HashMap, TreeMap, and LinkedHashMap.
The Map interface provides methods for adding, removing, and retrieving elements based on the key.
2) HashMap class:
HashMap is a specific implementation of the Map interface in Java.
It allows null keys and values, and permits one null key along with multiple null values.
HashMap uses the hash table data structure to store key value pairs.
It does not maintain any order in which the elements are stored.
HashMap allows quick retrieval of elements based on the hash code of the key.
3) Differences between Map and HashMap:
Map is an interface that defines the general contract for key value mappings, while HashMap is a specific implementation of the Map interface using a hash table.
Map does not provide concrete implementation, whereas HashMap is an actual class providing functionalities to store key value pairs.
HashMap allows null keys and values, while Map interface itself does not specify rules for handling null keys and values.
HashMap provides fast retrieval of elements based on hash codes, whereas some other implementations of Map like TreeMap maintain order based on keys.
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