Hello,

I am trying to find code for a dictionary class, similar to:

http://java.sun.com/j2se/1.4.2/docs/api/java/util/Dictionary.html

or also-known-as:

http://en.wikipedia.org/wiki/Associative_array

in order to associated key/value pairs with fast hash table lookup. Does anyone know of any code for this that will work with Processing?

Thanks,
John B.

Thanks, Dave!

I've never used Java before Processing (and I've only used Processing for a day), but I poked around a bit and couldn't immediately see how to use anything other than String key/value pairs in Processing.

<googles>

Sun's documentation for the HashMap class defines the params for HashMap.Put() as such: Object key, Object value, so I assume that when your example, above, uses Strings, some sort of implicit coercion is occurring or perhaps Java's strings are objects and Integers are primitive types (not objects).

<fiddles>

Let's try this:

Code:

import java.util.HashMap;
import java.lang.Number;

HashMap hm = new HashMap(); 

hm.put(new Integer(7),new Integer(10)); 
println(hm.get(new Integer(7)));
 

Well, storing the Integer works when I wrap it in an Integer object, but that seems pretty circuitous. Even doing the following to coerce Integers to Strings:

Code:

hm.put(str(7),str(10)); 
println(hm.get(str(7)));
 

Leaves me a bit concerned about performance -- I'm hoping there is an easier way, perhaps there is a Java class that will store Integer/Integer key/value pairs or Integer/Object key/value pairs. Perhaps I will have to roll my own Dictionary/HashMap class?

Thanks,
John B.