题解 | #计算某字符出现次数#

题目 计算某字符出现次数

日期：2022/03/15

思路

将给定字符和字符串都转化成大写，然后再遍历比较

代码

import java.util.*;
public class Main{
    public static void main(String[] args){
        
        Scanner sc = new Scanner(System.in);
        String str = sc.nextLine();
        char c = sc.next().charAt(0);
        int count = countTimes(str,c);
        System.out.println(count);
        
    }
            public static int countTimes(String str,char c){
            String newstr = str.toUpperCase();
            char[] arr = newstr.toCharArray();
            char newc = ch_toUpperCase(c);
            int count=0;
            for(char ch:arr){
                if(ch==newc)
                    count++;
            }
            return count;
        }
        
        public static char ch_toUpperCase(char c){
            if(c>='a' && c<='z')
                return  (char)(c-'a'+'A');
            return c;
        }
}