Map and Types of Map - Collection Framework

Written by?- Prajval Bhale

mail: [email protected] | GitHub: github.com/prajvalbhale

(all content are available on my github Profile in PDF or Doc Format)

Key Takeaways:

>> Map Take's Care about Unique Identifier.

>> We can map Unique Key to specific Value.

>> Their is Key Value Pair in Map.

>> Followings are the types of HashMap:

A). HashMap:

• this is unordered and unsorted.
• we can use HashMap when we not care about Insertion order.
• this allow one null key and multiple null Values.
• Duplicates are not allow.
• This set is not maintain any Insertion order and it is an unsorted.

B). HashTable:

• this is Synchronised and Thread Safe
• this not allow anything which is a Null.
• Duplicate Keys are not allowed.

C).LinkedHash Map:

• This maintain insertion order.
• slower than HashMap
• By using this I can expect fast Iteration.
• Duplicate keys are not allowed.

D). TreeMap:

• This is sorted in ascending order based on the key.
• Duplicate keys are not allowed.