List转为数组以及数组转为List

public class Demo {
    public static void main(String[] args) {
        List<Integer>list = new ArrayList<>();
        list.add(20);
        list.add(30);
        list.add(10);
        list.add(50);
        Collections.sort(list);
        System.out.println(list);
        //list转成数组
        Integer[] arr = list.toArray(new Integer[list.size()]);
        System.out.println(Arrays.toString(arr));
        //数组转成集合list  是受限集合
        String[] names = {"q","w"};
        List<String>list2 = Arrays.asList(names);
        System.out.println(list2);

    }
}