L Question: Common characters

public int getNumOfCommonChars(String[] inputs) {
  // Return 0 if null / empty input or only one string is provided
  if(inputs == null || inputs.length < 2) {
   return 0;
  } else {
   //create an int array to hold # times character appears 
   int[] charCounts = new int[256];
   for(String input : inputs) {
    Set<Character> uniqueCharSet = new HashSet<Character>();
    for(int i=0; i < input.length(); i++) {
     char ch = input.charAt(i);
     if (!uniqueCharSet.contains(ch)) {
      uniqueCharSet.add(ch);
      charCounts[(int) ch] += 1;
     }
    } 
   }
  
   int commonCharCount = 0;
   for (int i=0; i < 256; i++) {
    if (charCounts[i] == inputs.length()) {
     commonCharCount++;
    }
   }
   
   return commonCharCount;
  }
 }