LinkedHashMap preserves the insertion order Hashtable is synchronized, in contrast to HashMap. This gives us the reason that HashMap should be used if it is thread-safe, since Hashtable has overhead for synchronization. 2. HashMap If key of the HashMap is self-defined objects, then equals...
* <p>The method is called without synchronization: other threads may * access the cache while this method is executing. * * <p>If a value for {@code key} exists in the cache when this method * returns, the created value will be released with {@link #entryRemoved} * and discarded. ...
Hashtable is synchronized, in contrast to HashMap. This gives us the reason that HashMap should be used if it is thread-safe, since Hashtable has overhead for synchronization. 2. HashMap If key of the HashMap is self-defined objects, then equals() and hashCode() contract need to be f...