list是一个ArrayList的对象,哪个选项的代码填写到//todo delete处,可以在Iterator遍历的过程中正确并安全的删除一个list中保存的对象?( )Iterator it = list.iterator(); int index = 0;while (it.hasNext()){ Object obj = it.next(); if (needDelete(obj)) { //needDelete返回boolean,决定是否要删除 //todo delete } index ++; }