What are the differences between a HashMap and a Hashtable in Java?

What are the differences between a HashMap and a Hashtable in Java?

java collections hashmap hashtable

java

What happens when a duplicate key is put into a HashMap?

java hashmap hashtable

java

Good Hash Function for Strings

java hash hashtable hashcode

java

How do HashTables deal with collisions?

java hashtable collision-detection

java

ConcurrentHashMap and Hashtable in Java [duplicate]

java hashmap hashtable

java

Does "put" overwrite existing values?

java hashmap hashtable

java

What hashing function does Java use to implement Hashtable class?

java algorithm hashtable hash

java

How does Java order items in a HashMap or a HashTable?

java map hashtable hashmap hashcode

java