Java:虽然(true)没有得到正确的打印

Question

我开始自学Java，并且一直在做在线练习。

我无法获得正确的打印:每当我想通过输入 -1 退出程序时，它都会打印 -1 而不是最后输入的年份。如何解决此问题，以便打印最后输入的年份而不是 -1 ？我已经尝试了很多东西，例如 arrayLists 和其他循环，但我似乎没有让它工作。

谢谢。

import java.util.*;

public class Miniprojekti4_3 {

    private static Scanner input = new Scanner(System.in);

    public static void main(String[] args) {

        int command = 0;
        int year = 0;
        int days = 365;

        try {
            System.out.println("The program will ask you to input years. You can quit by typing -1 ");        

            while (true) {
                System.out.print("Insert year: ");
                year = Integer.parseInt(input.nextLine());   
                if (year == -1) {
                        break;
                } 
            }
        } catch (Exception e) {
             System.out.println("Error: program closing..");
             System.exit(1);
        }

        if (year % 4 == 0 && year % 400 == 0) {
              System.out.println("In the year " + year + " there is " + (days+1) +" days. "); 
        } else {
            // if the year is not a leap year
            System.out.println("In the year " + year + " there is " + days +" days. ");
        }
    }
}

Answer 1

如果您移动整个 if/else 部分来检查闰年并在 while(true) block 内显示日期，您应该得到您正在寻找的内容:

            while (true)
            {     
                System.out.print("Insert year: ");
                year = Integer.parseInt(input.nextLine());   
                if (year == -1)
                {
                    break;
                }

                if (year % 4 == 0 && year % 400 == 0) // if the year is a leap year.
                {

                    System.out.println("In the year " + year + " there is " + (days+1) +" days. "); 
                }
                else // if the year is not a leap year
                {

                    System.out.println("In the year " + year + " there is " + days +" days. ");
                }   
            }