Hey guys everything is fine with my code it works and is verified succesfully. I am posting this so that you guys could suggest me any further modifications in my code(i.e if there is some unnecessary code, or may be i could have written some logic better etc). Go through my code and suggest me if any. 
public class Solution {
    public static void main(String[] args) throws Exception {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        ArrayList<String> words = new ArrayList<>();
        for (int i = 0; i < 20; i++) {
            words.add(reader.readLine());
        }

        Map<String, Integer> map = countWords(words);

        for (Map.Entry<String, Integer> pair : map.entrySet()) {
            System.out.println(pair.getKey() + " " + pair.getValue());
        }
    }

    public static Map<String, Integer> countWords(ArrayList<String> list) {
        HashMap<String, Integer> result = new HashMap<>();
        int[] count = new int[list.size()];

        for (int i = 0; i < list.size(); i++){
            result.put(list.get(i), count[i]);
        }

        Iterator<Map.Entry<String, Integer>> iterator = result.entrySet().iterator();

        while (iterator.hasNext())
        {
            Map.Entry<String, Integer> pair = iterator.next();
            String key = pair.getKey();
            Integer value = pair.getValue();
            for (String i : list){
                if (i.equals(key)){
                    value++;
                    result.replace(key,value);
                }
            }
        }

        while (iterator.hasNext())
        {
            Map.Entry<String, Integer> pair = iterator.next();
            String key = pair.getKey();
            Integer value = pair.getValue();
                if (key.equals(iterator.next().getKey())){
                    value++;
                    result.replace(key,value);
                }
        }

        return result;
    }

}