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|Why is String immutable in Java ?|
|Why Char array is preferred over String for storing password?|
|How does making string as immutable helps with securing information ? How does String Pool pose a security threat ?|
|Difference between HashMap and Hashtable?|
|How is string object immutable if we can concat a string to it ?|
|How to implement an immutable class ?|
|If you are given a choice to implement the code to either Insert a Record or Update if already exist, Which approach will you follow ?|
|Why HashTable has been deprecated ?|
|Can we use null as a key for a map collection ?|
|What is an Immutable Object ?|