Question

求助，怎么给List<Long>赋值

Answer 1

List<Long> longList = new ArrayList<Long>();
longList.add(1L);
longList.add(2L);
longList.add(3L);
Long[] longArr = new Long[longList.size()];
longList.toArray(longArr);
System.out.println(longArr);
}

Answer 2

可以先声明
List<Long> list = new ArrayList<Long>();
Long l = 10000L;
list.add(l);