I need开发者_高级运维 a kind of map which is accessible in two directions, so with a key-key structure instead of key-value. Does this exist in Java? If not, what is the best way to create it?
I am not to Clojure and attempting to figure out how to do this. I want to create a new hash-map that for a subset of the keys in the hash-map applies a function to the elements. What is the best way
I\'ve been give some lovely Java code that has a lot of things like this (in a loop that executes about 1.5 million times).
If I pass the same key multiple times to HashMap’s put method, what happens to the original value? And what if even the value repeats? I didn’t find any documentation on this.
I have data that is organized in kind of a \"key-key\" 开发者_如何学编程format, rather than \"key-value\".It\'s like a HashMap, but I will need O(1) lookup in both directions.Is there a name for this
I have a java.util.HashMap object m (a return value from a call to Java code) and I\'d like to get a new map with an additional key-value pair.
I noticed in the source code for HashMap it lists the equals method as final. Why is it that when I override itI do not get a compile error?
I recently discovered that the implementation of the hash map in C++ will be called unordered_map. When I looked up why they weren\'t just using hash_map, I discovered that apparently there are compa
I have a HashMap that I\'m using in Processing and I\'d like to increment the value in the map. I Google\'d it and it showed me that the following code is correct:
I am very new to processing.org and Java. I am trying to store objects in a HashMap, and then iterate over the values of the HashMap, calling methods on the stored objects.
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