what is difference betwwen hashmap and hashtable ?
- 7 Answers
- 9872 Views
- Fidelity, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / deep pratap singh
HashMap HashTable
1> Not Synchronized Synchronized
2> can contain null cann't
You may also make HashMap Synchronized using generic
methods. Using Hashtable is bad habit. Try to avoid it.
| Is This Answer Correct ? | 10 Yes | 2 No |
Answer / ravikiran
hashmap allows one null key and multiple null values.
hashtable doesn't allow null elements
hashmap is not synchronized
hashtable is snchronized
hashmap is not legacy
hashtable is legacy
| Is This Answer Correct ? | 6 Yes | 0 No |
Answer / ajay yadav
Hash Map allows null values.
Hash Table dont allows null values.
| Is This Answer Correct ? | 4 Yes | 0 No |
Answer / javablossom
The Iterator is used in the hashmap is fail-safe and
whereas the Enumerator used in hashtable is not fail-safe.
| Is This Answer Correct ? | 1 Yes | 0 No |
Answer / sekhar
Both class are under map interface.But hash table is
synchronized.hashMap is not.we can explictly synchronize
hash map by using the method
Collections.synchronizedMap(Hash Map);
| Is This Answer Correct ? | 1 Yes | 1 No |
Answer / kvn
Hash map contains null values,but hash table does not.
| Is This Answer Correct ? | 1 Yes | 3 No |
What is multi level inheritance in java?
What modifiers are allowed for methods in an interface?
Where are local variables stored?
Explain about narrowing conversion in java?
How to declare an arraylist in java?
How can we make copy of a java object?
What is percentage in java?
For ease of programming you can consider the maze as a 2D array with colors represented by below integer and characters (in capital letters). • B - Black • W -White • G- Green • R- Red R B W B W W W W W W B W B B W W W W W W W B W B W W W B W W W W B B W W W B W W W B W W B B B B W B W B W W B W W W B W W W B B B W W B W W W B W W B W B W W W B W B W W W W B B W W W W B W W W W W G Shortest Route Problem: • Solution that finds the shortest Route between Red and Green  White will have 1 Weight.  Red and Green carry no weights.  Shortest path is the path with less weight when you add up the weights in the path.
Can there be an abstract method without an abstract class?
Are maps ordered java?
How to validate the request (Eg:user name and password) in session(http session)? not in LDAP server ?
what is the difference between a java object reference and c++ pointer?
Core Java 
