Import Hashmap In Java

In step 3, we have used for each loop to retrieve the values from the hashmap object. I need to import data from database with hashmap, there is a table media and i need to get the media_id(integer) and media_path(string). Example illustrating working with hashmap in java import java.util.*;

In this example we have demonstrated almost all the important methods of hashmap class. Hashmap<datatypeofkey, dataytpeofvalue> <name_of_<strong>hashmap</strong>> =new hashmap<datatypeofkey, dataytpeofvalue> (); To use hashmap in your code, you must import (import java.util.hashmap package) or its parent class.

They are made for quick retrieval.

If an existing key is passed then the previous value gets replaced by the new value. Hashmaps aren’t made for sorting. If you try to insert the duplicate key, it will replace the element of the corresponding key. This means we can insert a specific key and the value it is mapping to into a particular map.