编写程序，由键盘输入三个整数分别存入变量num1,num2,num3中，对它们进行排序，使用if-else结构，并按从小到大的顺序输出

本文链接：https://blog.youkuaiyun.com/LinGuiY1/article/details/131675815

该Java程序接收用户通过Scanner类输入的三个整数，然后进行排序。如果输入的不是整数，程序会给出错误提示。排序完成后，程序按升序打印出这三个数字。

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package day08;

import java.util.Scanner;

/**
 * Hw5
 *
 * @author Linguiyi
 * @version 1.0
 * @date 2023/7/11 18:23
 */
public class Hw5 {
    public static void main(String[] args) {
        int num1 = 0;
        int num2 = 0;
        int num3 = 0;
        System.out.print("输入num1：");
        num1 = scanInt();
        System.out.print("输入num2：");
        num2 = scanInt();
        System.out.print("输入num3：");
        num3 = scanInt();

        sort(num1,num2,num3);
    }

    private static void sort(int num1, int num2, int num3) {
        if (num1>num2){
            if (num1>num3){
                if (num2>num3){
                    System.out.println(num3);
                    System.out.println(num2);
                    System.out.println(num1);
                }else{
                    System.out.println(num2);
                    System.out.println(num3);
                    System.out.println(num1);
                }
            }else{
                System.out.println(num2);
                System.out.println(num1);
                System.out.println(num3);
            }
        }else{
            if (num3>num2){
                System.out.println(num1);
                System.out.println(num2);
                System.out.println(num3);
            }else if (num3>num1){
                System.out.println(num1);
                System.out.println(num3);
                System.out.println(num2);
            }else if (num3<num1){
                System.out.println(num3);
                System.out.println(num1);
                System.out.println(num2);
            }
        }
    }

    public static int scanInt(){
        Scanner s = new Scanner(System.in);
        int num = 0;
        if(s.hasNextInt()){
            num = s.nextInt();
        }else {
            // 输入错误的信息
            System.out.println("输入的不是整数！");
            s.close();
            return 0;
        }
        s.close();
        return num;
    }
}