String utility : Merging 2 string arrays

public static String[] mergeStringArrays(String array1[], String array2[]) {  
  if (array1 == null || array1.length == 0)  
   return array2;  
  if (array2 == null || array2.length == 0)  
   return array1;  
  List array1List = Arrays.asList(array1);  
  List array2List = Arrays.asList(array2);  
  List result = new ArrayList(array1List);    
  List tmp = new ArrayList(array1List);  
  tmp.retainAll(array2List);  
  result.removeAll(tmp);  
  result.addAll(array2List);    
  return ((String[]) result.toArray(new String[result.size()]));  
 }