判断字符的类型个数

package com.javabin.interface_;

/**
 * Copyright (C), 2018-2021, Mr.Lin
 * Author: Mr.Lin
 * Date: 2021/11/20 2:05
 * FileName: Homework05
 * Description:判断一个字符有多少个a~z,A~Z,0~9
 */
public class Homework05 {
    public static void main(String[] args) {
        String str="326afef a32faADF 22SA";
        conStr(str);
    }

    public static void conStr(String str) {
        if (str == null) {
            System.out.println("输入的字符为空！");
            return;
        }

        int strLen = str.length();
        int numCont = 0;
        int lowerCont = 0;
        int upperCont = 0;
        int everCont = 0;
        for (int i = 0; i < strLen; i++) {
            if (str.charAt(i) >= '0' && str.charAt(i) <= '9') {
                numCont++;
            } else if (str.charAt(i) >= 'a' && str.charAt(i) <= 'z') {
                lowerCont++;
            } else if (str.charAt(i) >= 'A' && str.charAt(i) <= 'Z') {
                upperCont++;
            }else {
                everCont++;
            }
        }
        System.out.printf("%s该字符一共有: %n %d个数字;%n %d个小写;%n %d个大写;%n %d个其他;",str,numCont,lowerCont,upperCont,everCont);
    }
}