题解 | #计算某字符出现次数#

import java.util.Scanner;

import java.util.regex.Pattern;

// 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
        while (in.hasNextLine()) { // 注意 while 处理多个 case
            String a = in.nextLine();
            String b = in.nextLine();
            if(b != " ") {
                // StringBuilder c = new StringBuilder(a);
                // StringBuffer d = new StringBuffer(a);
                int length = a.length();
                int i = 0;
                int j = 0;
                while(i < length) {
                    String e = a.substring(i, i+1);
                    
                    if(e.toUpperCase().equals(b.toUpperCase())) {
                        j = j + 1;
                    }
                    i = i + 1;
                } 
                System.out.println(j);
            }
            
        }
    }
}