Get ArrayList Index according to HashMap Key Value

Question

I Have a ArrayList as ArrayList<HashMap<String, String>> arrayList_LatLong = new ArrayList<HashMap<String, String>>(); in which I put HashMap into that ArrayList. The HashMap key-value pair suppose as follows

map.put(key1,value1);  
map.put(key2,value2);  
map.put(key3,value3);  
map.put(key4,value4);  
map.put(key5,value5);

Now I want ArrayList Index according to Value1, that means I have Value1 and I want the respective ArrayList Index so that I can get Other Values also from the respective HashMap.

Explain with example..

Pankaj Kumar
– Pankaj Kumar

2013-09-06 08:37:42 +00:00
Commented Sep 6, 2013 at 8:37 — Pankaj Kumar
– Pankaj Kumar, Commented Sep 6, 2013 at 8:37

mrsus · Accepted Answer · 2013-09-06 08:49:33Z

4

try this--->

public static int getIndexOFValue(String value, List<Map<String, String>> listMap) {

    int i = 0;
    for (Map<String, String> map : listMap) {
        if (map.containsValue(value)) {
            return i;
        } 
        i++;
    }
    return -1;
}

answered Sep 6, 2013 at 8:49

mrsus

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Comments

Antoine Marques · Accepted Answer · 2013-09-06 08:37:37Z

0

I think you just need to defined it this way :

ArrayList<HashMap<String, Integer>> arrayList_LatLong = new ArrayList<HashMap<String, Integer>>();

When you want to get the index in the list you just gotta do :

Integer newIndex = arrayList_LatLong.get(someIndex).get("aKey");
HashMap<String, Integer> indexes = arrayList_LatLong.get(newIndex);

answered Sep 6, 2013 at 8:37

Antoine Marques

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Comments

user2746424 · Accepted Answer · 2013-09-06 09:29:11Z

0

You can do something like:

Here i am searching for the value "android". you can change it according to your code

String value = "android";

int getIndex(){
  int i = -1;
  for (Map<String, String> map : arrayList_LatLong) {
    for (String key : map.keySet()) {
      if (map.get(key).equals(value)) {

          i = arrayList_LatLong.indexOf(map);

      }
   } 
}

return i;
}

answered Sep 6, 2013 at 9:29

user2746424

1

Comments

Artem · Accepted Answer · 2015-06-14 07:31:23Z

0

public static int getIndexOFkey(String key, ArrayList> listMap) {

    int i = 0;
    for (i=0; i<listMap.size(); i++)
    {
        if(listMap.get(i).get("id").equalsIgnoreCase(key))
        {
         return i;
        }
    }

    return -1;
}

answered Jun 14, 2015 at 7:31

Artem

1

1 Comment

ZygD Over a year ago

How about indenting the first line and commenting a bit the code?

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