java判断是否是回文数

[code=language-java]public class HuiWenTest
{

//方法一:若为回文数，则反转后与原来的数应该相等
public  static boolean isCircleNumber1(int num)
{
String temp = String.valueOf(num);
StringBuffer sb = new StringBuffer(temp);
return sb.reverse().toString().equals(temp);
}
//方法二：首位与末尾位是否相等判断，若为回文数，则必然相等
public static boolean isCircleNumber2(int num){
boolean flag = true;
String temp = String.valueOf(num);
char[] arr =  temp.toCharArray();
int len =arr.length;
for(int i=0,j=len-1;i<j;){
if(arr[i++] == arr[j--]){
}else{
flag = false;
break;
}
}
return flag;
}
public static void main(String args[]) {
int num = 12321;
System.out.println(isCircleNumber1(num));
System.out.println(isCircleNumber2(num));
}

}