package com.company;

import java.util.Scanner;

public class isNumeric {
    public static int isNumeric(String str) {
        int count = 0;
        for (int i = 0; i < str.length(); i++) {
            if (str.charAt(i) > '0' && str.charAt(i) < '9') {  //找数字
                count++;   //数字在0~9之间，计数器+1
            }
        }
        return count;
    }

    public static void main(String[] args) {
        System.out.println("请输入一个字符串：");
        Scanner scanner = new Scanner(System.in);
        String str = scanner.nextLine();
        System.out.println("字符串中的数字个数为："+isNumeric(str));
    }
}