java判断是否是回文数
public class HwTest{ //方法一 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 public static boolean isCircleNumber2(int num){ int oldValue = num; int temp = 0; while(num > 0){ temp = temp*10 +num%10; num = num/10; } return temp == oldValue; }//方法三?public static boolean isCircleNumber3(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)); System.out.println(isCircleNumber3(num)); } }??