1.String[]转list
String[] arr = {"a", "b"}; List<String> list = Arrays.asList(arr); //此集合无法操作添加元素 List<String> list1 = new ArrayList<String>(list); //此集合可操作元素
2.list转String[]
List<String> list = new ArrayList<>(); list.add("a"); list.add("b"); String[] arr = list.toArray(new String[list.size()]);