rev(rev(x) + rev(y))
数字翻转
http://www.nowcoder.com/questionTerminal/bc62febdd1034a73a62224affe8bddf2
用StringBuilder的reverse方法，和Integer的parseInt方法：
import java.util.*;
public class Main {
public static void main(String[] args) throws Exception{
Scanner sc = new Scanner(System.in);
int x = sc.nextInt(), y = sc.nextInt();
StringBuilder s1 = new StringBuilder(Integer.toString(x)).reverse();
StringBuilder s2 = new StringBuilder(Integer.toString(y)).reverse();
int r = Integer.parseInt(s1.toString()) + Integer.parseInt(s2.toString());
StringBuilder ans = new StringBuilder(Integer.toString(r)).reverse();
System.out.println(Integer.parseInt(ans.toString()));
}
}
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