HashMap

[Brucy]

Hi,
i'm trying to edit a hashmap in a method, i can get it to return the non-key value (using get() ) but it returns it as an object and i'm strugling to convert in into an integer to edit it. I don't know if i'm being an idiot (more then likely ) or not.

If anyone could help i'd be very grateful

Andy

[ArchAngel]

You need to cast objects can come out of HashMap:

import java.util.Map;
import java.util.HashMap;

public class Test {
        public static void main(String[] args) {
                Map myMap = new HashMap(); // Program by interfaces.
                myMap.put("One", new Integer(1));
                myMap.put("Two", new Integer(2));
                Integer associatedWithOne = (Integer)myMap.get("One"); // Note the cast
                Integer associatedWithTwo = (Integer)myMap.get("Two"); // Note the cast
                System.out.println(associatedWithOne);
                System.out.println(associatedWithTwo);
        }
}

It seems a little strange to begin with, but you soon get used to it (the next version of Java will make this much nicer).

Note - you can't put primitives (int, char, long) directly into a HashMap, you have to put them in 'wrapper' classes (Integer, Character, Long).

[Brucy]

ok cheers for that, got one error less now