题目：
例如给规定字符串str = "a_3_b_4_c_5",给定下标4,会得到字符'b'
str = "a_3_b_4_c_5" 就意味着字符串是str = "aaabbbbccccc";
然后下标4，就会得到字符‘b’
代码实现：
package com.chenyu.string.cn;import java.util.Arrays;public class GetCharInString {public static String target = "a_3_b_4_c_8";public static void main(String[] args) {char result = getCharInString(target, 8);System.out.print("result:" + result);}//方法一 先分割 再拼接 再获取public static char getCharInString(String target, int index) {if (target == null || target == "") {return 0;} if (index < 0) {return 0;}String[] targets = target.split("_");String result = "";for (int i = 0; i < targets.length; ++i) {if (i % 2 == 0) {result += getStringByAcount(targ
)
的应用)
