java - Java 代码中的循环问题

Question

Use a while loop to keep asking the user to enter the order of numbers until the user does give two numbers in the right order (first smaller than second

嗨!我是java初学者，我有这段代码，但我无法循环“错误”消息。它只打印 2 次

import java.util.Scanner;

public class Q6 {
    public static void main(String[] args) {
        int num1, num2;
        Scanner keyboard = new Scanner(System.in);
        System.out.print("Please type two numbers:");
        num1 = keyboard.nextInt();
        num2 = keyboard.nextInt();

        if (num1 < num2) {
            int counter = num1;
            while (counter <= num2) {
                System.out.print(counter + " ");
                counter = counter + 1;
            }
        } 
        else {
            System.out.println("Error: the first number must be smaller than the second");
            System.out.print("Please type two numbers: ");
            num1 = keyboard.nextInt();
            num2 = keyboard.nextInt();
        }
    }
}

Answer 1

int num1,num2;
while (num1>=num2) {
    Scanner keyboard = new Scanner(System.in);
    System.out.println("Please type two numbers");
    System.out.printn("first number must be smaller than the second:)";
    num1 = keyboard.nextInt();
    num2 = keyboard.nextInt();
}