在控制台输入一串英文字符，然后统计出每个字母出现的次数忽略大小写

Posted 2022-08-05 anonymityning

import java.util.Scanner;

public class Demo2 
    public static void main(String[] args) 
        //首先输入一串字符，并将字符转化为小写
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入一串英文字母");
        char[] str = scanner.next().toLowerCase().toCharArray();

        //利用for（）循环将字符从a-z 便利一遍，再依次找出出现的次数
        System.out.println("每个字符出现的次数是：");
        for (char j = ‘a‘; j < ‘z‘; j++) 
            int count = 0;
            for (int i = 0; i < str.length; i++) 
                if (j == str[i]) 
                    count++;
                
            
            //假如该字符存在
            if (count != 0) 
                System.out.println("字母" + j + "出现:" + count + "次");