884. Uncommon Words from Two Sentences

// Runtime: 1 ms, faster than 100.00% of Java online submissions for Uncommon Words from Two Sentences.
// Memory Usage: 37.8 MB, less than 77.22% of Java online submissions for Uncommon Words from Two Sentences.

class Solution {
    public String[] uncommonFromSentences(String A, String B) {
    String[] aWords = A.split(" ");
    String[] bWords = B.split(" ");
    
    
    HashMap<String, Integer> freqMap = new HashMap<>(); 
        
    for (String currWord : aWords)
        freqMap.put(currWord, freqMap.getOrDefault(currWord, 0) + 1);
        
    for (String currWord : bWords)
        freqMap.put(currWord, freqMap.getOrDefault(currWord, 0) + 1);
    
    
    ArrayList<String> result = new ArrayList<>();
    for (String currWord : freqMap.keySet()) 
    {
        if (freqMap.get(currWord) == 1) 
            result.add(currWord);
    }
    
    
    String[] res = new String[result.size()];
    for (int i = 0; i < res.length; ++i)
        res[i] = result.get(i);
    
    return res;
}
}