需求:
將集合轉爲數組,List<Long> --> Long[]
代碼:
List<Long> list = new ArrayList<>();
list.add(10000000000L);
list.add(10000000001L);
list.add(10000000002L);
list.add(10000000003L);
list.add(10000000004L);
Long[] arr = new Long[list.size()];
Long[] longsArr = list.toArray(arr);
for(int i = 0; i < arr.length; i++){
System.out.println(longsArr[i]);
}