public class SimNum {public SimNum() { } public static void main(String[] args) {int sum = 0;for(int i = 1000; i <= 3000; i ++) { if(SimNum.valid(i)){
sum ++;
System.out.println(i); }}System.out.println("一共有" + sum + "个回文数"); }public static boolean valid(int num) {StringBuffer snum = new StringBuffer(num + "");return snum.toString().equals(snum.reverse().toString()); } }
