Hashmap is not Synchronized where as Hashtable is Synchronized. Hashm

what is Hashmap & Hashtable wirh example?

Question Posted / sivadasan

Answer Posted / sivadasan

Hashmap is not Synchronized where as Hashtable is
Synchronized.

Hashmap allows null values as keys.
Hashtable doesn't allows null values as keys.

Is This Answer Correct ?

3 Yes

6 No

Please Help Members By Posting Answers For Below Questions

How do you declare an empty string?

1058

What is a databasemetadata?

946

Does java have extension methods?

970

Which collection does not allow duplicates in java?

970

What is super constructor?

993

How to make a write-only class in java?

1054

Explain inheritance in java?

979

Can a class be protected in java?

961

Are the imports checked for validity at compile time? Will the code containing an import such as java.lang.abcd compile?

1101

What happens if a constructor is declared private?

1027

What is default exception handling in java?

1025

Is 0 a real number?

1036

what is encapsulation in java? Explain

1103

What is meant by class loader? How many types are there? When will we use them?

964

Explain how to convert any java object into byte array.

966