1 public class ReserveString { 2 public static void main(String[] args) { 3 System.out.println("Please Input String:"); 4 Scanner sc = new Scanner(System.in); 5 String a = sc.next(); 6 boolean state = false; 7 StringBuffer sb = new StringBuffer(); 8 for (int i = 0; i < a.length(); i++) { 9 String str = a.substring(i, i + 1); 10 if (str.matches("^[0-9]*$")) { 11 state = true; 12 sb.append(str); 13 } else { 14 if (state) { 15 System.out.print(sb.reverse().toString()); 16 state = false; 17 sb.setLength(0); 18 } 19 System.out.print(str); 20 } 21 } 22 if (state) { 23 System.out.print(sb.reverse().toString()); 24 } 25 26 } 27 }