Java中使用String数组

String数组的三种写法

String arr[] = new String[20]; //创建一个长度为20的String 类型数组。
String arr[] = {"小明","小红"};
String[] arr = new String[]{ConstantWeChat.TOKEN, timestamp, nonce };

将参数进行字典排序

Arrays.sort(arr);
StringBuilder content = new StringBuilder();
for (int i = 0; i < arr.length; i++) {
    content.append(arr[i]);
}

String转换成List

String[] arr = new String[]{"aa","bb","cc"};
List<String> list = Arrays.asList(arr);

List转换成String

List<String> list = new ArrayList<String>();
list.add("aa");
list.add("bb");
list.add("cc");
String[] arr = list.toArray(new String[list.size()]);