判断一个数是不是回文数

/*判断回文数  thinking revese the number*/ import java.util.Scanner;public  class Test3{   private static boolean flag = true; private static void judgeNum( int num){      int temp ,newNum,oriNum=num ;      String str="";     while(flag){     // the       temp= num %10;       num= num/10;         str=str+temp+"";         if (num <1) {         flag = false;}     }      newNum =  Integer.parseInt(str);  if(newNum== oriNum)  { System.out.println("是回文数");} else {System.out.println( newNum+"不是回文数");} }  public static void main(String args[]){    Scanner  sc = new Scanner(System.in);     System.out.println("pls input a number ");     int num =sc.nextInt();       judgeNum(num);     }}