判断回文数，利用String类

[java]代码库

import java.util.*; 
public class Main{ 
    public static void main(String[] args) { 
         Scanner scan = new Scanner(System.in);
         int d = scan.nextInt();
         String s = String.valueOf(d);
         int n = s.length();
         String s1 = "";
         int i, j, flag = 0;
         for(i = 0, j = n-1; i <n&&j >= 0; i++, j--) {
        	 s1 += s.charAt(j);
         }
         
         System.out.println(n);
         if(s.equals(s1)) {
        	 System.out.println("Y");
         }
         else
        	 System.out.println("N");
         scan.close();  
    } 
}  

2:
import java.util.*; 
public class Main{
    public static void main(String[] args) {
         Scanner scan = new Scanner(System.in);
         int N = scan.nextInt();
         String s = String.valueOf(N);
         String s1;
         StringBuffer sb = new StringBuffer(s); 
         s1 = new String(sb.reverse().toString());
         System.out.println(s.length());
         if(s.equals(s1))
        	 System.out.println("Y");
         else
        	 System.out.println("N");
         
         scan.close(); 
    }
}