统计输入的字符串中的各种字符次数

import java.util.Scanner;

public class demo14{
    public static void main(String[] args) {
        String str ;
        int countNumber = 0;
        int countOther = 0;
        int countLower = 0;
        int countUpper = 0;

        Scanner sc = new Scanner(System.in);
        System.out.println("请输入字符串:");
        str = sc.next();
        char[] chs = str.toCharArray();

        for (int i = 0; i < chs.length; i++) {
            char ch = chs[i];

            if(ch >= 'a' && ch <= 'z')
            {
                countLower++;
            }else if(ch >= 'A' && ch <= 'Z' )
            {
                countUpper++;
            }else if(ch >= '0' && ch <= '9' ){
                countNumber++;
            }else
            {
                countOther++;
            }
        }
        System.out.println("大写字母个数:" + countUpper);
        System.out.println("小写字母个数:" + countLower);
        System.out.println("数字个数:" + countNumber);
        System.out.println("其他字符个数:" + countOther);
    }
}