What is the use of Hashmap in java?? | SoloLearn: Learn to code for FREE!


What is the use of Hashmap in java??


1/31/2019 2:31:31 PM


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In a HashMap you can store data collections. You store a pair (key, value). For example you want a list of persons and their jobs. Person --> key Job --> value "John Doe"; "Teacher" "Jane Doe"; "Programmer" ... Hashmap: [John Doe = Teacher, Jane Doe = Programmer] The special thing is that you can not use a key more than one time. Adding a key that already exists, overwrites the old element. In the challenge adjacent clone letters I used a Hashmap for the letters (key) and the number of clones (values). Because I wanted the connection between the letter and their clones. And I didn't want duplicates. https://code.sololearn.com/cy5oNTefTXIb/?ref=app


Thank you


You can also look here: https://www.sololearn.com/learn/Java/2181/?ref=app


How do you format it correctly? I've been searching for this function similar to a dictionary in python. Can you assign the same name to a key and value such as "Apple"; "Apple" ?