博客

一、List 转 String[]

 @Test
    void arraysTostr() {
        List<String> list = new ArrayList<>();
        list.add("mm");
        list.add("nn");
        list.add("hh");
        String[] strings = list.toArray(new String[list.size()]);
        System.out.println(strings.length);
    }

二、 String[] 转List

 @Test
    void strToArrays() {
        String[] strs = new String[]{"mm","nn","hh"};
        List<String> list = Arrays.asList(strs);
        System.out.println(list.toString());
    }