刷题思路来源于 代码随想录
import java.util.Scanner; class Main { public static void main(String[] args) { Scanner in=new Scanner(System.in); String str=in.nextLine(); StringBuilder sb=new StringBuilder(); char[] chs=str.toCharArray(); for(char ch:chs){ if(Character.isDigit(ch)){ sb.append("number"); }else{ sb.append(ch); } } System.out.println(sb.toString()); } }