题解 | #计算某字符出现次数#
计算某字符出现次数
https://www.nowcoder.com/practice/a35ce98431874e3a820dbe4b2d0508b1
import java.util.Scanner; // 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); // 注意 hasNext 和 hasNextLine 的区别 String line = in.nextLine(); char ch = in.nextLine().charAt(0); //char cIgnoreCase = ch < 'a' ? (char) (ch + ('a' - 'A')) : ch; line = 'a' <= ch && ch <= 'z' ? line.toLowerCase() : ('A' <= ch && ch <= 'Z' ? line.toUpperCase() : line); long count = line.chars().filter(e -> e == ch).count(); System.out.println(count); } }