数字前面加*

将一个字符中所有出现的数字前后加上符号“*”，其他字符保持不变

示例1：

Jkdi234klowe90a3

Jkdi*234*klowe*90*a*3*

import java.util.Scanner;

public class Main {


    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        while (scanner.hasNext()){
            String s = scanner.nextLine();
            getCubeRoot(s);
        }
    }

    public static void getCubeRoot(String str) {
        char[] chars = str.toCharArray();
        StringBuilder builder = new StringBuilder();
        boolean isFirst = true;
        int len = chars.length - 1;
        for (int i = 0; i < chars.length; i++) {
            if(chars[i] >= '0' && chars[i] <= '9'){
                if(isFirst){
                    builder.append("*").append(chars[i]);
                }else {
                    builder.append(chars[i]);
                }
                if(len == i){
                    builder.append("*");
                }
                isFirst = false;
            }else {
                if(!isFirst){
                    builder.append("*");
                }
                isFirst = true;
                builder.append(chars[i]);
            }
        }
        System.out.println(builder);
    }
}