Online references to this issue include Java HashMap.keySet return value, Bug Report 4501848, Bug Report 4756277, HashMap.Entry Not Serializable?, and Java Core APIs: private nonserializable ...

In Java, nested classes are categorized as either static member classes or inner classes. ... we’ll look at the HashMap class, which is part of the Java Collections Framework in the java.util ...

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. When Java 2 was released, the architects of the language ...