Answers for "counting frequency through hashmap"

frequency count in java using hashmap

static void countFreq(int arr[], int n)
    {
        Map<Integer, Integer> mp = new HashMap<>();
 
        // Traverse through array elements and
        // count frequencies
        for (int i = 0; i < n; i++)
        {
            if (mp.containsKey(arr[i]))
            {
                mp.put(arr[i], mp.get(arr[i]) + 1);
            }
            else
            {
                mp.put(arr[i], 1);
            }
        }
        // Traverse through map and print frequencies
        for (Map.Entry<Integer, Integer> entry : mp.entrySet())
        {
            System.out.println(entry.getKey() + " " + entry.getValue());
        }
    }