java怎么判断两个Set 里的对象的值是否相同

Set里的元素是不能重复的，那么用iterator()方法来区分重复与否

public static boolean isSetEqual(Set set1, Set set2) {
  
  if (set1 == null && set2 == null) {
   return true; // Both are null
  }

  if (set1 == null || set2 == null || set1.size() != set2.size()
    || set1.size() == 0 || set2.size() == 0) {
   return false;
  }
  
  Iterator ite1 = set1.iterator();
  Iterator ite2 = set2.iterator();
  
  boolean isFullEqual = true;
  
  while (ite2.hasNext()) {
   if (!set1.contains(ite2.next())) {
    isFullEqual = false;
   }
  }
  
  return isFullEqual;
 }