题解 | #计算某字母出现次数#

import java.io.Serializable;
import java.util.Scanner;

/**

• HJ2 计算某字母出现次数

• 输入：

• ABCabc

• A

• 输出：

• 2

• /
  public class Main {
  public static void main(String[] args) {

    Scanner sc = new Scanner(System.in);
  
    String s = sc.nextLine();
    char[] chars = s.toCharArray();
    String s1 = sc.next();
    char c = s1.charAt(0);
    char ch = Character.isLowerCase(c) ? c : Character.toLowerCase(c);
    int sum = 0;
    for(int i=0; i<s.length(); i++){
        if(Character.isLowerCase(chars[i])){
            if(ch==chars[i]){
                sum++;
            }
        }
        if(Character.isUpperCase(chars[i])){
            char c1 = Character.toLowerCase(chars[i]);
            if(ch==c1) sum++;
        }
    }
  
    System.out.println(sum);

}

}