A colleague of mine recently ran into an issue that I have not run into myself, but found to be interesting and, in my opinion, worth blogging about here. During some distributed Java development ...

如果HashMap的键(key)是自定义的对象，那么需要按规则定义它的equals()和hashCode()方法。 class Dog { String color; Dog(String c) { color = c ...

Get() When we want to get a value from the map, HashMap calculates the bucket and gets the value with the same key from the list (or tree). Example Code Lets try to create a hashmap of products. We ...

What if a developer needs constant, low-level synchronization at the class level? It's still not a justification to choose a Hashtable. A developer can create a synchronized HashMap through the ...