Hopefully this example helps to explain. You can obviously skip over the creating bit as you already have a table and presumably you just want to get all of the values out of it.
% create example Java hashtable and add some key/value pairs
h = java.util.Hashtable;
h.put('Name', 'John');
h.put('Country', 'UK');
% retrieve the value for a specific key
h.get('Name');
% retrieve all key names
allKeys = arrayfun(@char, h.keySet.toArray, 'UniformOutput', false);
% retrieve all key values
allValues = cellfun(@(x) h.get(x), allKeys, 'UniformOutput', false);
