问题及代码：


package first;

import java.util.Scanner;

public class text {

	public static void main(String[] args) {
		System.out.println("请输入一个整数：");
		Scanner get = new Scanner(System.in);
		int a = get.nextInt();
		int sum = 0;
		while (a != 0) {
			int b = a % 10;
			sum = sum * 10 + b;
			a = a / 10;
		}
		System.out.println(+sum);
	}
}


运行结果：