I am looking to retrieve key from the value for a SingletonMap

```
Map<String,String> map = Collections.singletonMap("key1", "value1");

```

I am looking for a easy way to get the key, based on value. Rather then way that I have done before. Which I feel is too much overhead for a singleTon Map.

```
public static List<String> getKey(String value, Map<String, String> map) 
{
    List<String> keys = new ArrayList<String>();
    for(Entry<String, String> entry:map.entrySet()) 
    {
        if(value.equals(entry.getValue())) 
        {
            keys.add(entry.getKey());
        }
    }
    return keys;
}

```

Any inputs or suggestion will be helpful.