输入一个字符串，输出时数字倒序。例如：输入"hello2345wo7654",输出则为"hello5432wo4567"

 public class ReserveString {
     public static void main(String[] args) {
         System.out.println("Please Input String:");
         Scanner sc = new Scanner(System.in);
         String a = sc.next();
         boolean state = false;
         StringBuffer sb = new StringBuffer();
         for (int i = 0; i < a.length(); i++) {
             String str = a.substring(i, i + 1);
             if (str.matches("^[0-9]*$")) {
                 state = true;
                 sb.append(str);
             } else {
                 if (state) {
                     System.out.print(sb.reverse().toString());
                     state = false;
                     sb.setLength(0);
                 }
                 System.out.print(str);
             }
         }
         if (state) {
             System.out.print(sb.reverse().toString());
         }

     }
 }