public static void main(String[] args) throws IOException {
List<Integer> list = addnum();
System.out.println("输入:");
// 方法一:强大的Scanner类
Scanner sc = new Scanner(System.in);
System.out.println("输入的是:" + sc.next());
// 方法二:
// BufferedReader br = new BufferedReader(new
// InputStreamReader(System.in));
// System.out.println(br.readLine());
// 方法三:
// char i = (char) System.in.read();
// System.out.println(i);
}