题解 | #表示数字#

for

import java.util.*;
public class Main {
    public static void main(String[] args){
        Scanner sc =new Scanner(System.in);
        while(sc.hasNextLine()) {
            String str = sc.nextLine();
            String str1 = str.replaceAll("[0-9]", "");
            if (str1.length() == 0) {
                System.out.println("*"+str+"*");
                continue;
            }
            StringBuilder sb = new StringBuilder();
            for (int i =0; i < str.length(); i++) {
                char a = str.charAt(i);
                if (a >= '0' && a <= '9') {
                     sb.append("*");
                    for (int j = i; j < str.length(); j++) {
                        char b =str.charAt(j);
                        i = j;
                        if (b < '0' || b > '9') {
                            sb.append("*");
                             sb.append(b);
                            break;
                        }
                        sb.append(b);
                    }
                } else {
                    sb.append(a);
                }
            }
            char l = str.charAt(str.length() - 1) ;
            if (l >= '0' && l <= '9') {
                sb.append("*");
            }
            System.out.println(sb.toString());
        }
    }
}