Which One is optimal to choose ?
Syncronized hash map or Hash table with single thread model?
How can a hash map syncronized with out using syncrozed
blocks in programm?
- 3 Answers
- 8551 Views
- Four soft, I also Faced
- E-Mail Answers
Answer Posted / ranganathkini
The java.util.Hashtable provides a synchronized collection
implementation to store key-value pairs. Hence
synchronization of a Hashtable is not necessary.
Synchronization has a performance overhead and therfore must
be used with caution in only those situations where a
resource(s) is shared by multiple threads. Hence a
java.util.HashMap implementation can be used for single
threaded model and it can be externally synchronized if it
is to be used in a mult-threaded model.
To get a synchronized version of a java.util.HashMap without
using synchronized blocks, do this:
// make sure this is in imports
import java.util.*;
// our unsynchronized map object
Map myMap = new HashMap();
// get a synchronized map from our unsynchronized map
Map mySyncMap = Collections.synchronizedMap( myMap );
After this, all access to the map must be via mySyncMap
reference and NOT myMap.
Another way to acquire a synchronized map is:
Map mySyncMap = Collections.synchronizedMap( new HashMap() );
| Is This Answer Correct ? | 5 Yes | 1 No |
Post New Answer View All Answers
In java, how many ways you can take input from the console?
Differentiate between stringbuffer and stringbuilder in java.
What is the right data type to represent a price in java?
What is thread pool? How can we create thread pool in java?
Can you override private or static method in java?
What is try-with-resources in java?
Can we serialize singleton class?
Why is inheritance used in java?
How to display names of all components in a Container?
What does this () mean in java?
Why do we use string?
What are the main concepts of oops in java?
How many threads does a core java have?
Distinguish between a predicate and a function?
Explain importance of inheritance in java?
