What is difference between hash mapping and hash table?

Answers were Sorted based on User's Feedback



What is difference between hash mapping and hash table?..

Answer / khalid

Both provide key-value access to data. The Hashtable is one
of the original collection classes in Java. HashMap is part
of the new Collections Framework, added with Java 2, v1.2.
The key difference between the two is that access to the
Hashtable is synchronized on the table while access to the
HashMap isn't. You can add it, but it isn't there by
default.

Another difference is that iterator in the HashMap is fail-
safe while the enumerator for the Hashtable isn't. If you
change the map while iterating, you'll know.

And, a third difference is that HashMap permits null values
in it, while Hashtable doesn't.

For new code, I would tend to always use HashMap.

Is This Answer Correct ?    11 Yes 1 No

What is difference between hash mapping and hash table?..

Answer / murali.s

hashtable is a Synchronized.
hashmap is not a Synchrobnized.
Hashtable doesn,t accept null key,values
Hashmap accept null key,values

Is This Answer Correct ?    4 Yes 0 No

What is difference between hash mapping and hash table?..

Answer / ravi jain

Khalid's answer is right but it has one mistake i.e.

in second point HashMap is also fail-fast...

Is This Answer Correct ?    1 Yes 0 No

What is difference between hash mapping and hash table?..

Answer / sandya

Yes... I agree with u khalid.
can u send the examples in CFW.
Thanks in Advance.

Is This Answer Correct ?    0 Yes 1 No

What is difference between hash mapping and hash table?..

Answer / khalid

Both provide key-value access to data. The Hashtable is one
of the original collection classes in Java. HashMap is part
of the new Collections Framework, added with Java 2, v1.2.
The key difference between the two is that access to the
Hashtable is synchronized on the table while access to the
HashMap isn't. You can add it, but it isn't there by
default.

Another difference is that iterator in the HashMap is fail-
safe while the enumerator for the Hashtable isn't. If you
change the map while iterating, you'll know.

And, a third difference is that HashMap permits null values
in it, while Hashtable doesn't.

For new code, I would tend to always use HashMap.

Is This Answer Correct ?    0 Yes 5 No

Post New Answer

More Core Java Interview Questions

What is super keyword explain with example?

0 Answers  


Which is faster string or stringbuilder?

0 Answers  


How do you call a reference in java?

0 Answers  


why java is not supporting multiple inheritence?

3 Answers  


What are computer functions?

0 Answers  






What is the difference between the synchronized() & static synchronized()?

2 Answers   HP, SparkTG,


Give a brief description of java socket programming?

0 Answers  


What is a bubble sort in java?

0 Answers  


Howto get an object that will perform date & time calculations then format it for output in some different locales with different date style.can ne1 tel me the answer of this question.pls

0 Answers  


Which containers use a FlowLayout as their default layout?

3 Answers  


Can a class have multiple constructors?

0 Answers  


What are the 4 types of characters?

0 Answers  


Categories