Not really...
(It is possible, but convoluted, and it is not the way most programmers would do.)

One alternative is to use a function identifier. Something like:

1. int functionNb;
2. void keyPressed()
3. {
4.   if (key == 'a') functionNb = 1;
5.   if (keyCode == UP) functionNb = 20;
6.   // You can put the numbers above in an array, then iterate on them in ENTER
7.   if (lkeyCode == ENTER)
8.   {
9.     switch (functionNb)
10.     {
11.     case 1: move(mouseX, mouseY); break;
12.     case 2: move(mouseX, UP_MOVE); break;
13.     // And so on
14.     }
15.   }
16. }

You could use Runnables in a HashMap. Something like:

HashMap<String,Runnable> functionsByKey = new HashMap<String,Runnable>();
functionsByKey.put("a", new Runnable() { public void run() { //doStuff } });

Then on keyPress:

String keyString = key+"";
Runnable function = functionsByKey.get(keyString);
if(function != null) function.run();