题解 | #计算某字符出现次数#

• 不区分大小写，因此传递参数时统一转换成小写

import java.util.Locale;
import java.util.Scanner;

/**
 * class com.sloera.nowcoder
 * user sloera
 * date 2022/2/23
 */
public class Main {
  public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
    // 注意 hasNext 和 hasNextLine 的区别
    while (in.hasNextLine()) { // 注意 while 处理多个 case
      final String source = in.nextLine();
      final String alphabet = in.nextLine();
      int a = count(source.toLowerCase(Locale.ROOT), alphabet.toLowerCase(Locale.ROOT));
      System.out.println(a);
    }
  }

  private static int count(String source, String alphabet) {
    final char c = alphabet.charAt(0);
    int count = 0;
    for (int i = 0; i < source.length(); i++) {
      if (source.charAt(i) == c) {
        count++;
      }
    }
    return count;
  }
}