字符串题解答

Question

判断字符A在字符串ADSAAAAAERGASDF中出现的次数，求过程

Answer 1

int count = 0;
        String str = "ADSAAAAAERGASDF";
        for(int i=0;i<str.length();i++){
            if(str.charAt(i)=='A'){
                count++;
            }
        }
        System.out.println(count);

Answer 2

var str='ADSAAAAAERGASDF'

var arr=str.match(/A/gi);

console.log(arr.length);

Answer 3

<?php

    $str = "ADSAAAAAERGASDF";

    $num = substr_count($str,'A');

    echo $num;

Answer 4

循环字符串，计算次数就行了

Answer 5

不要做伸手党