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);

}
}