HashMap in Java | Java Collections | Collection Framework | Java Tutorial For Beginners

Publicado em: 11 Julho 2022
no canal de: Krishna Sakinala (Automation Testing)

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HashMap:

To represent a group of objects as Key-Value pairs then we should go for HashMap.
The underlying data structure is Hashtable.
Duplicate Keys are NOT allowed.
Duplicate Values are allowed.
Insertion order is NOT preserved and it is based on hashcode values of Keys.
Heterogenous objects are allowed for both Keys and Values.
null insertion is possible for Key (only once as duplicate keys are not allowed).
null insertion is possible for Values ( any number of times).
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