public boolean removeIf(Predicate<? super E> filter) {
for (int i=0; modCount == expectedModCount && i < size; i++) {
@SuppressWarnings("unchecked")
final E element = (E) elementData[i];
if (filter.test(element)) { //lambda表达式匹配
removeSet.set(i); //如果成功 则添加到bitset中
removeCount++;
}
}
for (int i=0, j=0; (i < size) && (j < newSize); i++, j++) {
i = removeSet.nextClearBit(i); //获得bitmap中为false的下标 也就是不删除的元素
elementData[j] = elementData[i]; //将下标对应的元素放入到新数组中
}
for (int k=newSize; k < size; k++) {
elementData[k] = null; // Let gc do its work
}