数组和集合List的相互转化

一、数组转为List

调用Arrays类的静态方法asList

　　static void convertArray2List() {
        String[] strs = new String[]{"hehe","haha","heihei"};
        List<String> list = Arrays.asList(strs);
        
        System.out.println(JSON.toJSONString(list));
    }

结果 ： ["hehe","haha","heihei"]

 

二、List转为数组（以ArrayList为例）

①、Object[] toArray();

②、T[] toArray(T[] a);

　　static void convertList2Array() {
        List<String> list = new ArrayList<String>();
        list.add("hehe");
        list.add("haha");
        list.add("heihei");
        String[] strs =  list.toArray(new String[]{});
        
        System.out.println(JSON.toJSONString(strs));
    }

结果 ：["hehe","haha","heihei"]