Arraylist elements Compare with HashMap keys

Add the List elements to a Set and use the technique here:

https://www.experts-exchange.com/questions/24528143/Comparing-Hash-Tables-and-accessing-values-dynamically.html?cid=1131&anchorAnswerId=24731075#a24731075

ArrayList<String> superList = new ArrayList<String>();

            superList.add("A");superList.add("B");superList.add("C");superList.add("E");superList.add("D");

            HashMap hm = new HashMap();
            hm.put("B","1111");hm.put("D","1112");hm.put("A","1113");hm.put("E","1114");
            
            Set<String> set =new HashSet<String>();
        Iterator it = superList.iterator();
         while (it.hasNext())
         {
                // Get element
                String element = (String)it.next();
                set.add(element);
          }
         System.out.println("list in set"+set);
         
         Set common = new HashSet(set.keySet());
         common.retainAll( hm.keySet());
           System.out.println(common);
After converting my list to hashset the set.keySet() will not work right.
ur logic will not work in that case...how to get those values to fit into ur logic....
            

With generics:

Set<String> common = new HashSet<String>(superList);

The rest of it would be as follows:

        common.retainAll(hm.keySet());
        List<String> valuesList = new ArrayList<String>(common.size());
        for (String key : common) {
            valuesList.add(hm.get(key));
        }
        System.out.println(valuesList);

Select allOpen in new window

:-)

ITS FAILING>>>>
public class test5
{
      public ArrayList<String> getData(HashMap<String, ArrayList<String>> AMap,ArrayList<String> temp)
      {
            
            System.out.println(" Invloking getData ");
            Set<String> tempSet = new HashSet<String>(temp);
        System.out.println("getData "+tempSet);
        Set commonKeys = new HashSet(AMap.keySet());
        ArrayList<String> ruleGroupIds = new ArrayList<String>(commonKeys);
        commonKeys.retainAll( tempSet );
           System.out.println(commonKeys);
             for (Object key : commonKeys)
           {
                  ArrayList<String>  value = (ArrayList<String>) AMap.get(key);
                   ruleGroupIds.addAll(value);
             }
             System.out.println("result " + ruleGroupIds);
           return ruleGroupIds;
      }
      public static void main(String args[])
      {
            ArrayList<String> compareList = new ArrayList<String>();
            compareList.add("A");      compareList.add("B");      compareList.add("D");
            ArrayList<String> superList = new ArrayList<String>();
            ArrayList<String> ruleGroupIds = new ArrayList<String>();
            ArrayList<String> ruleGroupIdsss = new ArrayList<String>();
            ruleGroupIdsss.add("1234");ruleGroupIdsss.add("12345");
            superList.add("A");superList.add("B");superList.add("C");superList.add("E");//superList.add("D");

            HashMap<String, ArrayList<String>> hm = new HashMap<String, ArrayList<String>>();
            hm.put("B",ruleGroupIdsss);hm.put("D",ruleGroupIdsss);hm.put("A",ruleGroupIdsss);hm.put("E",ruleGroupIdsss);
            hm.put("C",ruleGroupIdsss);
            
            test5 t = new test5();
            t.getData(hm, compareList);
      }
}


ITS FAILING.The result is
result [C, B, A, E, D, 1234, 12345, 1234, 12345, 1234, 12345] which is wrong.
It sud pull corresponding arraylist instead of keeping all keys and values..
can u check..

Haven't really got time to look in detail but i would put more debug printouts in to see what you're starting and ending with

i modified the logic its working...no need to proceed...