NYOJ之字符串逆序输出

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AC代码：

 1 import java.util.Scanner;
 2 
 3 public class Main {
 4 
 5     public static void main(String[] args) {
 6         
 7         Scanner sc=new Scanner(System.in);
 8         
 9         int times=Integer.parseInt(sc.nextLine());
10         while(times-->0){
11             String s=sc.nextLine();
12             String ans=reverseExclusiveDigitAndSpace(s);
13             System.out.println(ans);
14         }
15         
16     }
17     
18     public static String reverseExclusiveDigitAndSpace(String s){
19         StringBuilder sb=new StringBuilder(s.length());
20         for(int i=s.length()-1;i>=0;i--){
21             char c=s.charAt(i);
22             if(Character.isLetter(c)) sb.append(c);
23         }
24         return sb.toString();
25     }
26     
27 }

题目来源： http://acm.nyist.net/JudgeOnline/problem.php?pid=266