java如何判断是否是回文数

//回文数：是一种数字。如：98789, 这个数字正读是98789,倒读也是98789 //正读倒读一样，所以这个数字就是回文数 import java.util.Scanner; public class HuiWenShu { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("请输入一个整数："); int num = sc.nextInt(); String str1 = num + ""; // String str1 = Integer.toString(num); // String str1 = String.valueOf(num); StringBuilder str2 = new StringBuilder(str1); str2.reverse(); int count = 0; for (int i = 0; i < str1.length(); i++) { if (str1.charAt(i) != str2.charAt(i)) { System.out.println(str1 + "不是回文数"); break; } else { count++; } } if (count == str1.length()) { System.out.println(str1 + "是回文数"); } } }

Scanner in = new Scanner(System.in); System.out.println("请输入一个整数N=："); int input = in.nextInt(); int i = 0; int sum = 0; int record=input; while(true){ i = input%10; sum =sum*10+i; input /= 10; if(input==0) break; } if(sum==record)System.out.println("是回文"); else System.out.println("不是回文");