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So for creating a dictionary in Java you can use Hashtable. This class implements a hash table, which maps keys to values and any non-null object can be used as a key or as a value. In Java hierarchy Hashtable extends Dictionary and implements Map.
A Java dictionary is an abstract class that stores key-value pairs. Given a key, its corresponding value can be stored and retrieved as needed; thus, a dictionary is a list of key-value pairs. The Dictionary object classes are implemented in java. util .
In Java the HashMap implements the Map interface while the Dictionary does not. That makes the Dictionary obsolete (according to the API docs). That is, they both do a similar function so you are right that they seem very similar...a HashMap is a type of dictionary. You are advised to use the HashMap though.
Java Dictionary API Client Library (maven project) You can integrate this library into a Java application. In the sample, using the library simplifies the request process to the API server and directly returns the result object in string form.
You'll want a Map<String, String>. Classes that implement the Map interface include (but are not limited to):
HashMapLinkedHashMapHashtableEach is designed/optimized for certain situations (go to their respective docs for more info). HashMap is probably the most common; the go-to default.
For example (using a HashMap):
Map<String, String> map = new HashMap<String, String>();
map.put("dog", "type of animal");
System.out.println(map.get("dog"));
type of animal
This creates dictionary of text (string):
Map<String, String> dictionary = new HashMap<String, String>();
you then use it as a:
dictionary.put("key", "value");
String value = dictionary.get("key");
Works but gives an error you need to keep the constructor class same as the declaration class. I know it inherits from the parent class but, unfortunately it gives an error on runtime.
Map<String, String> dictionary = new Map<String, String>();
This works properly.
Use Map interface and an implementation like HashMap
There's an Abstract Class Dictionary
http://docs.oracle.com/javase/6/docs/api/java/util/Dictionary.html
However this requires implementation.
Java gives us a nice implementation called a Hashtable
http://docs.oracle.com/javase/6/docs/api/java/util/Hashtable.html
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