Fast lookups: Lookups take O(1) time on average. Flexible keys: Most data types can be used for keys, as long as they're hashable. Initial Capacity: It is the capacity of HashMap at the time of its ...

In other words, it was impossible to have a key be in the map without having a corresponding non-null value. package dustin.examples; import java.util.EnumMap; import java.util.HashMap ...

If the value * already exists in the HashMap, update the value. * get(key): Returns the value to which the specified key is mapped, or -1 if * this map contains no mapping for the key. * remove(key) : ...

And, of course, when we put things into a HashMap, it's always a key-value pair, right? It's always two things. So, here's how the Java Virtual Machine gets around that. It creates its own class ...

While the Hashtable was part of the initial Java release over two decades ago, the HashMap is the correct key-value store to use today. One key HashMap vs. Hashtable difference is the fact that the ...