What is the Difference Between Hashtable and Hashmap?
🆚 Go to Comparative Table 🆚The main differences between Hashtable and HashMap in Java are:
- Thread Safety: Hashtable is synchronized, which means it can be shared between multiple threads and is thread-safe. HashMap, on the other hand, is non-synchronized, meaning it cannot be accessed by multiple threads without additional synchronization code.
- Null Values: HashMap allows one null key and multiple null values, while Hashtable does not allow any null keys or values.
- Performance: HashMap generally offers better performance than Hashtable since it is non-synchronized, making it faster in single-thread applications.
In summary, if thread synchronization is not needed, HashMap is generally preferred over Hashtable due to its better performance and ability to handle null values. However, if you require thread safety, you should use Hashtable or a synchronized version of HashMap.
On this pageWhat is the Difference Between Hashtable and Hashmap? Comparative Table: Hashtable vs Hashmap
Comparative Table: Hashtable vs Hashmap
Here is a table comparing the differences between Hashtable and HashMap in Java:
Feature | HashMap | Hashtable |
---|---|---|
Synchronization | Not synchronized, not thread-safe | Synchronized, thread-safe |
Null values | Allows one null key and multiple null values | Doesn't allow any null key or value |
Performance | Faster due to no synchronization | Slower because of synchronization |
Use case | Preferred for non-threaded applications | Recommended for multithreaded implementations |
Synchronization method | Cannot be directly synchronized | Can be unsynchronized using Collections.synchronizedMap() |
Order | Does not guarantee constant order over time | Order remains constant over time |
HashMap and Hashtable are both data structures that map keys to values. HashMap is not synchronized, making it faster and suitable for non-threaded applications. On the other hand, Hashtable is synchronized, making it thread-safe and suitable for multithreaded implementations.
Read more:
- Dictionary vs Hashtable
- HashMap vs TreeMap
- equals vs hashCode in Java
- TreeSet vs HashSet
- Map vs Atlas
- TreeSet vs TreeMap
- Hashing vs Encrypting
- Arraylist vs Vector
- Blockchain vs Hashgraph
- Hash vs Weed
- ArrayList vs LinkedList
- Stack vs Heap
- RDBMS vs Hadoop
- Memcached vs Redis
- Hash vs Weed vs Pot
- Big Data vs Hadoop
- JPA vs Hibernate
- List vs Set
- Bitmap vs Vector