需求：
将集合转为数组，List<Long> --> Long[]
代码：
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
]);
}
