如何添加到 java 代码，要求用户输入 1 到 1000 之间的金额

Question

Java program that will:

1. User can input an amount from 1.00 to 1,000.00
2. Any amount beyond the allowed range will display an error.

This block of code below is prints the number entered by an user:

import java.util.Scanner;

public class HelloWorld {

    public static void main(String[] args) {

        // Creates a reader instance which takes
        // input from standard input - keyboard
        Scanner reader = new Scanner(System.in);
        System.out.print("Enter a number: ");

        // nextInt() reads the next integer from the keyboard
        int number = reader.nextInt();

        // println() prints the following line to the output screen
        System.out.println("You entered: " + number);
    }
}

Answer 1

public static void main(String[] args)
    {
        Scanner reader = new Scanner(System.in);
        double number;
            System.out.print("Enter a number from 1.00 to 1,000.00: ");
            number= reader.nextDouble();
        //As long as the input is not within the range requests a new input
        while (!(number>=1.00 && number<=1000.00)){
            System.out.print("Input arrival!\nEnter a number from 1.00 to 1,000.00: ");
            number= reader.nextDouble();
        }
        System.out.println("You entered: " + number);
    }

note: The number range you specified corresponds to a double type