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Tag: Explain HashMap

Difference between HashMap and LinkedHashMap?

Difference between HashMap and LinkedHashMap?

Difference between HashMap and LinkedHashMap? It is the child class of HashMap. The LinkedHashMap class is very similar to HashMap in most aspects. However, the linked hash map is based on both hash table and the linked list to enhance the functionality of hash map. It maintains a doubly-linked list running through all its . . . Read more

Difference between HashMap & Hashtable in Java?

Difference between HashMap & Hashtable in Java?

Difference between HashMap & Hashtable in Java? The underlying data-structure is HashTable. Insertion order is not preserved and it is based on HashCode is keys. Duplicate keys are not allowed but values can be duplicated. Heterogeneous objects are allowed for both Key and value. Null is allowed for Key(only once). . . . Read more