import java.util.HashMap; import java.util.HashSet ... the class of the key that's put in as the key-value pair. But you can override that, right? So, you can see that I've overridden that hashCode ...

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 ...