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The HashMap class is similar to the IdentityHashMap class. The IdentityHashMap implements the Map interface using Hashtable, and when comparing keys, it uses reference-equality rather than object-equality (and values). This class is not intended to be a general-purpose Map implementation. This class is used when the user wants to compare objects by reference. It is […]
September 14, 2022 | Java | 1 comment
The Hashtable class creates a hash table by mapping keys to values. As a key or value, any non-null object can be used. The objects used as keys must implement the hashCode and equals methods in order to successfully store and retrieve objects from a hashtable. Hashtable class Declaration: Remember the following: A Hashtable is […]
August 3, 2022 | Java | No comments
Since Java 1.2, HashMap<K, V> class has been part of the Java collection. This class can be found in java.util package. It implements the Java Map interface in its most basic form. If you try to insert the duplicate key, it will replace the associated key’s element. The key index makes it simple to conduct […]
August 1, 2022 | Java | No comments
The LinkedHashSet class is an ordered HashSet with a doubly-linked List across all entries. This class is used when the iteration order must be maintained. The order of the elements in a HashSet is unpredictable, whereas a LinkedHashSet allows us to iterate through them in the order in which they were inserted. Declaration of LinkedHashSet: […]
July 30, 2022 | Java | No comments
The Java HashSet class is used to create a collection that stores data in a hash table. It derives from AbstractSet and implements the Set interface. This class allows for the null element. The class also provides constant time performance for fundamental operations such as add, delete, contains, and size, assuming the hash function properly […]
July 29, 2022 | Java | No comments