java - 按升序显示三个非负整数

Question

提示用户输入三个非负整数。按升序显示整数。

import java.util.Scanner;

{
    int number1,number2,number3;
         Scanner keyboard = new Scanner (System.in);
         number1=keyboard.nextInt();
         number2=keyboard.nextInt();
         number3=keyboard.nextInt();

        if(number1<number2&&number1<number3&&number2<number3)
        {
            System.out.println(number1);
            System.out.println(number2);
            System.out.println(number3);
        }

        else if(number1>number2&&number1>number3&&number2>number3)
        {
            System.out.println(number3);
            System.out.println(number2);
            System.out.println(number1);
        }

        else if(number1<number2&&number1<number3&&number2>number3)
        {
            System.out.println(number1);
            System.out.println(number3);
            System.out.println(number2);
        }

        else if(number2>number1&&number2>number3&&number1>number3)
        {
            System.out.println(number3);
            System.out.println(number1);
            System.out.println(number2);
        }

        else if (number3>number1&&number3>2&&number1>number2)
        {
            System.out.println(number2);
            System.out.println(number1);
            System.out.println(number3);
        }

输出:

213

123

附注我不允许使用 while 语句、swing 和 for。我是java新手，所以这是我能想到的。有更快的方法吗？谢谢。

Answer 1

这是冒泡排序的一种实现。它并不比您的实现好多少，但可以让您了解将来如何使用循环。发生的情况是，在前 2 个区 block 之后，最大值将位于第三位。然后下一个 block 修复剩余的两个数字。您可以将 if 子句移动到一个单独的函数中，该函数接受要比较和切换的两个数字作为参数。

public static void main(String[] args) {


 int number1,number2,number3;
 Scanner keyboard = new Scanner (System.in);
 number1=keyboard.nextInt();
 number2=keyboard.nextInt();
 number3=keyboard.nextInt();

 int temp;

 if (number2 < number1){
     temp = number2;
     number2 = number1;
     number1 = temp;
 }

 if (number3 < number2){
     temp = number3;
     number3 = number2;
     number2 = temp;
 }

 if (number2 < number1){
     temp = number2;
     number2 = number1;
     number1 = temp;
 }
  System.out.println(number1);
  System.out.println(number2);
  System.out.println(number3);

}