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sahil girdhar
retrieve kv pairs using hashmap
1 Answer(s)      2 years and 11 months ago
Posted in : Java Beginners


i want to retrieve k,v-pairs from a hashmap. the entrys are like this:

a = 3,4 b = 5,6

and so on. i need combinations of these values.

a=3, b=5. a=3, b=6. a=4, b=5. a=4, b=6.

I don't know how many keys and how many entrys the values have. with entryset i can get the values but not combinations. it looks like recursion but how?


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January 26, 2012 at 5:58 PM


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


public class R2T2Generator {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub

        R2T2Generator r2t2generator=new R2T2Generator();
        Map<String,String[]>map=new TreeMap<String,String[]>();
        map.put("ProductSet",new String[]{"IA","EA"});
        map.put("role",new String[]{"Internal","External"});
        map.put("mode",new String[]{"D"});
        r2t2generator.mapPermute(map, "");
    }
    public void mapPermute(Map<String, String[]> map, String currentPermutation) {
        String key = map.keySet().iterator().next(); // get the topmost key

        // base case
        if (map.size() == 1) {          
            for (String value : map.get(key)) {
                System.out.println(currentPermutation + key + "=" + value);
            }
        } else {
            // recursive case
            Map<String, String[]> subMap = new TreeMap<String, String[]>(map);

            for (String value : subMap.remove(key)) {
                mapPermute(subMap, currentPermutation + key + "=" + value + ", ");
            }
        }
    }

}


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