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Arraylist elements Compare with HashMap keys

Posted on 2009-06-30
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Last Modified: 2013-12-29

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");

I have to copmapre superList elements with the keys of HashMap hm where the matching key is there

there i have to pull the corresponding value of it and put it in a List.

Like
ArrayList al = new ArrayList();
al sud contain {1113,1111,1114,1112}


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");
 
I have to copmapre superList elements with the keys of HashMap hm where the matching key is there
 
there i have to pull the corresponding value of it and put it in a List.
 
Like
ArrayList al = new ArrayList();
={1113,1111,1114,1112}

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Question by:satyabrata25
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9 Comments
 
LVL 86

Expert Comment

by:CEHJ
ID: 24745804
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Author Comment

by:satyabrata25
ID: 24746374
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....
            
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LVL 86

Accepted Solution

by:
CEHJ earned 750 total points
ID: 24746517
>>Set common = new HashSet(set.keySet());

should be

Set common = new HashSet(superList);
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LVL 86

Expert Comment

by:CEHJ
ID: 24746521
With generics:

Set<String> common = new HashSet<String>(superList);
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 24748386
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);

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LVL 86

Expert Comment

by:CEHJ
ID: 24752768
:-)
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Author Comment

by:satyabrata25
ID: 24753020

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..
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 24753369
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
0
 

Author Comment

by:satyabrata25
ID: 24754040
i modified the logic its working...no need to proceed...
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