Solution884.java

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;

public class Solution884 {
 public String[] uncommonFromSentences(String A, String B) {
 String unionSentence = A +" "+ B;
 String[] unionSentenceList = unionSentence.split(" ");
 HashMap<String,Integer> hashMap = new HashMap<>();

 List<String> ans = new ArrayList<>();

 for (String item:unionSentenceList) {
 if (hashMap.containsKey(item)){
 hashMap.put(item,2);
 }else {
 hashMap.put(item,1);
 }
 }

 for (String key:hashMap.keySet()){
 if (hashMap.get(key)==1) {
 ans.add(key);
 }
 }

 return ans.toArray(new String[ans.size()]);
 }

 public static void main(String[] args) {
 Solution884 s = new Solution884();
 String A = "apple apple";
 String B = "banana";
 System.out.println(Arrays.toString(s.uncommonFromSentences(A,B)));
 }
}