string list转string,string转换list

List 转换为 String数组 List<String> list = new ArrayList<String>(); list.add("a"); list.add("b"); String[] arr = list.toArray(new String[list.size()]); String 数组转换为 List String[] arr = new String[] {"c", "d"}; 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