![]() The hashcode() method returns the integer value generated by the hashing algorithm, while the equals() method compares two strings based on the content of the strings. In HashMap, the key or value object must implement the equals() and hashcode() method.īecause, When we insert the key object into the map, we need to use hashcode() there, while we need the equals() method when we try to get the value from the map. Java HashMaps FAQs Question: What is the requirement for using Object as a key or value in HashMap? In which order are mappings stored in HashMap?įor more commonly asked interview questions at FAANG and tier-1 tech companies, visit the Interview Questions page.How to remove the mapping while iterating over HashMap in Java?.What are some ways to iterate over the HashMap in Java?.What happens if we use HashMap in a Java multithreaded application?.Which data structure HashMap represents?.How does HashMap handle collisions in Java?.How does the put() method of HashMap works in Java?.MyMap: Difference Between HashMap and HashSet in Java It can be also declared like: HashMap myMap= new HashMap() Here is the example containing the declaration of HashMap in java. We can declare the Map in the following ways: Public class HashMap extends AbstractMapimplements Map, Cloneable, Serializable Instead, we can use wrapper classes (like Integer or Double). HashMap only stores object reference, making it impossible to use primitive data types like double or int. ![]()
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