Java实现整数的逆序输出的三种方法

import java.util.Scanner;
 
class Cycle01
{
	public static void main(String[] args)
	{
		Scanner input = new Scanner(System.in);
		System.out.print("输入一个整数：");
		int num = input.nextInt();
		while (num!=0)
		{
			System.out.print(num % 10);
			num /= 10;
		}
	}
}

class Cycle02
{
	public static void main(String[] args)
	{
		//注意：num >=0 
		Scanner input = new Scanner(System.in);
		System.out.print("请输入一个整数：");
		int num = input.nextInt();
		String reverse = "";
 
		while (num != 0)
		{
			reverse += num % 10;
			num /= 10;
		}
 
		System.out.println(reverse);
 
	}
}

class Cycle03
{
	public static void main(String[] args)
	{
		Scanner input = new Scanner(System.in);
		System.out.print("请输入一个整数：");
		int num = input.nextInt();
		int result = 0;
 
		while(num!=0)
		{
			int x = num % 10;
			result = result * 10 + x; 
			num /= 10;
		}
 
		System.out.println(result);
	}
}