/**
* Returns <tt>true</tt> if this set contains the specified elements.
*
* @param o element whose presence in this set to be tested
* @return <tt>true</tt> if this set contains the specified element
*/
@Override
public boolean contains(Object o) {
if (o == null) {
return false;
}
if (!(o instanceof Integer)) return false;
Integer i = (Integer) o;
if (i < 0) throw new RuntimeException("i < 0: " + i);
checkInvariants();
int wordIndex = wordIndex(i);
return (wordIndex < wordsInUse) && ((words[wordIndex] & (1L << i)) != 0);
}
/**
* Removes the specified element from this set if it is present.
*
* @param o object to be removed from this set, if present
* @return <tt>true</tt> if the set contained the specified element
*/
@Override
public boolean remove(Object o) {
if (!(o instanceof Integer)) {
return false;
}
Integer i = (Integer) o;
if (i < 0) return false;
if (!contains(i)) {
return false;
}
int wordIndex = wordIndex(i);
if (wordIndex >= wordsInUse) return false;
words[wordIndex] &= ~(1L << i);
--size;
modCount++;
recalculateWordsInUse();
checkInvariants();
return true;
}
