list转long[]数组

//list转long数组
List<Long> list = new ArrayList<>();
 Long[] skuIds = list.toArray(new Long[list.size()]);

//list转string数组
List<String> list = new ArrayList<String>();
        list.add("a1");
        list.add("a2");
        String[] toBeStored = list.toArray(new String[list.size()]);
        for (String str : toBeStored) {
            System.out.println(str);
        }