Difference between HashMap and HashTable.
Difference between HashMap and HashTable can be seen below:
| HashMap | HashTable |
|---|
| Methods are not synchronized | Key methods are synchronized |
| Not thread safety | Thread safety |
| Iterator is used to iterate the values | Enumerator is used to iterate the values |
| Allows one null key and multiple null values | Doesn’t allow anything that is null |
| Performance is high than HashTable | Performance is slow |
