ArrayList to HashMap

[S Majumder]

Hi everybody ,
Is there any java methods available by which I can take the ArrayList values and put into the HashMap's key or value ?

I am giving one example here :

List<Integer> myList = new ArrayList<Integer>();

 myList .add(6);
 myList .add(7);
 myList .add(8);
 myList .add(9);
 
Map<Integer,Integer> myMap = new HashMap<Integer,Integer>();

I know I can do it by iterating the myList into loop & get those values & put into myMap.

Thanks

S

[Campbell Ritchie]

It is quite easy to put keys or values into a Map, but you need to put them in pairs. If your elements from the Map go as Keys, what would you use as Values? If your elements from the Map go as Values, what would you use as Keys?

[Rob Spoor]

Nope, that's the only one. The reason is the completely different structure of List (and Set, Collection, Queue, etc - all flat sequence structures) versus Map (key-to-value mapping).