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"]