Difference Betwixt Hashmap Too Hashset Inwards Java

Monday, September 16, 2019 Add Comment Edit

HashMap vs HashSet is the most oftentimes asked inquiry during whatever core coffee interview and interview is non said completed until they volition non comprehend the Collection Framework and multi-threading interview in addition to collections are uncompleted without Covering Hash Set in addition to HashMap.

Both HashMap in addition to HashSet are role of collection framework which allows us to move amongst a collection of objects. Collection Framework has their ain interfaces in addition to implementation classes. Basically, a collection is divided every bit Set Interface, List, in addition to Queue Interfaces. All these interfaces own got their ain belongings besides apart from they larn from a collection similar Set allows Collection of objects precisely forbids duplicate value, List allows duplicate along amongst indexing.Queue plant on FCFS algorithm.

First, nosotros own got ane expect on What HashMap in addition to HashSet are in addition to hence volition move out for Differences betwixt HashSet in addition to HashMap

What is HashSet inwards Java?

HashMap vs HashSet is the most oftentimes asked inquiry during whatever Difference betwixt HashMap in addition to HashSet inwards Java

override equals() in addition to hashCode() method hence that nosotros tin hand the axe banking concern tally for equality in addition to no duplicate value are stored inwards our set.if nosotros own got created our ain objects nosotros demand to implement hashCode() in addition to equal() inwards such a way that volition move able to compare objects correctly when storing inwards a ready hence that duplicate objects are non stored,if nosotros own got non override this method objects volition accept default implementation of this method.

public boolean add(Object o) Method is used to add together an chemical component inwards a ready which returns faux if it’s a duplicate value inwards instance of HashSet otherwise returns truthful if added successfully.

What is HashMap?

HashMap is an implementation of Map Interface, which maps a telephone substitution to value.Duplicate keys are non allowed inwards a map.Basically map Interface has ii implementation classes HashMap in addition to TreeMap the principal departure is TreeMap maintains fellowship of the objects precisely HashMap volition not.HashMap allows cipher values in addition to cipher keys.HashMap is non synchronized,but collection framework supply methods hence that nosotros tin hand the axe brand them synchronized if multiple threads are going to access our hashmap in addition to ane thread structurally changes our map.

public Object put(Object Key,Object value) method is used to add together an chemical component inwards the map.

You tin hand the axe read to a greater extent than nearly HashMap inwards my article How HashMap plant inwards Java in addition to Difference betwixt HashMap in addition to hashtable inwards Java

Difference betwixt HashSet in addition to HashMap inwards Java

Following are closed to differences betwixt HashMap in addition to HashSet:

HashMap	Hash Set
HashMap is an implementation of Map interface	HashSet is an implementation of Set Interface
HashMap Stores information inwards cast of key-value pair	HashSet Store entirely objects
Put method is used to add together chemical component inwards map	Add method is used to add together chemical component is Set
In hash map hashcode value is calculated using telephone substitution object	Here fellow member object is used for calculating hashcode value which tin hand the axe move same for ii objects hence equal () method is used to banking concern tally for equality if it returns faux that way ii objects are different.
HashMap is faster than HashSet because unique telephone substitution is used to access object	HashSet is slower than Hashmap

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