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Tag: What is HashMap in Java

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