题解 | #统计字符#
统计字符
https://www.nowcoder.com/practice/539054b4c33b4776bc350155f7abd8f5
import java.util.*; // 注意类名必须为 Main, 不要有任何 package xxx 信息 public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); String str = in.nextLine(); in.close(); System.out.println(str.length() - str.replaceAll("[A-Za-z]", "").length()); System.out.println(str.length() - str.replaceAll("\\s", "").length()); System.out.println(str.length() - str.replaceAll("[0-9]", "").length()); System.out.println(str.length() - str.replaceAll("[^0-9a-zA-Z\\s]","").length()); } }