Indeed, if a Java Map implementation allows for null values, then it is possible for the Map to return its value for the given key, but that value might be a null.

Cannot Assume Serializability for Java Map’s Nested Classes. how-to. Oct 23, 2010 7 mins. Software Development.

Java Maps Two. Create a Column class with the following fields and include appropriate constructors, getters, setters: - Int columnId - String columnName - String dataType Create a Table class with ...