java - 检查数组中的整数是否在范围内

Question

基本上，我要编写的程序是从客户那里获取 12 个月的能源使用情况，然后输出总使用量、两种费率的价格(公式包含在代码中)并说出哪种费率更便宜。但它还必须检查这 12 个月中每个月的输入是否在范围内(大于“0”且小于或等于“1000”)。我找到了一种相当简单(？)的方法来使用数组来做到这一点，但是我不知道如何检查该数组中扫描的每个整数是否实际上在 0 < int <= 1000

如果整数小于 0 或大于 1000，程序必须输出一行“请输入有效金额”，并再次要求输入相同的整数，这样就不会存储错误的值。有道理吗？

import java.util.Scanner;

public class EnergyConsumptionExample {

    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);

        int total_usage;
        float t1_cost, t2_cost;
        final int MAX_USAGE = 1000, MIN_USAGE = 0;

        int[] energyCons = new int[12];

        for (int month = 0; month < energyCons.length; month++) {
            System.out.print("Please enter the monthly kWh usage for month ");
            System.out.print((month + 1) + ": ");
            energyCons[month] = scan.nextInt();
        }

        int totalCons = 0;
        for (int month = 0; month < energyCons.length; month++) {
            totalCons += energyCons[month];
        }

        System.out.println();
        System.out.println("Total usage for the year was " + totalCons + " kWh");

        t1_cost = (float) (totalCons * 0.1);
        t2_cost = (float) ((totalCons * 0.09) + 50);

        System.out.println("Using tariff one, the cost is: " + t1_cost);
        System.out.println("Using tariff two, the cost is: " + t2_cost);
        System.out.println();

        if (t1_cost > t2_cost) {
            System.out.println("Tariff two would be cheaper for this customer.");
        } else {
            System.out.println("Tariff one would be cheaper for this customer.");
        }

    }
}

Answer 1

将输入读取循环更改为如下所示:

for (int month = 0; month < energyCons.length; month++) {
  System.out.print("Please enter the monthly kWh usage for month ");
  System.out.print((month + 1) + ": ");
  int inputValue = scan.nextInt();
  while (inputValue < 0 || inputValue > 1000) {
    System.out.println("Please enter a valid amount: ");
    inputValue = scan.nextInt();
  }
  energyCons[month] = inputValue;
}