java - if-else 语句和运算符的问题

Question

因此，对于我的家庭作业，我必须编写一个程序，允许用户输入他们愿意为房屋支付的最高金额作为整数。这就是问题所在；我必须使用 if-else 语句和 JOptionPane 对话框。

所以我想出了这段代码:

import javax.swing.JOptionPane;

public class housingDecision {  

    public static void main(String[] args) {
         //listed things that need to be identified
         int houseMoney;
         String input;
         input = JOptionPane. showInputDialog("How much money do you have?");
         //making the input be listed by the user
         houseMoney = Integer. parseInt(input);
         //set up so that if its more than the parameters, itll move on to the next if else statement
         if (houseMoney >= 250000 && houseMoney <= 100000 );
         { 
             input = "You can afford a Townhouse!";
         }
         if(houseMoney >= 250001 && houseMoney <= 400000);
         {
         input = "You can afford a Single Family House!";
         }

         if (houseMoney >= 400001 && houseMoney <= 800000);
         {
        input = "You can afford a Luxury House!";
         }
         if (houseMoney >= 800001);
         {
        input = "Wow! You can Afford a mansion!";
         }          
    }
}

但是，当输入整数时，它不会运行。我需要改变什么才能让这不再是一个问题？

Answer 1

看起来运行得很好。话虽如此，它并没有实现您想要实现的任务。

1. 在多个方法调用中， . 后面有空格。
2. 如果资金不在任何范围内，您就没有理由。
3. 您根本没有打印结果。您只需将value 设置为结果消息，然后不对其执行任何操作。
4. 您的第一个 if 语句已损坏，值似乎已交换。

除此之外，您需要删除 if 语句后面的分号，因为它不会导致根据条件调用其 block 。

工作代码(没有对话框输入)如下所示:

public class Main {
    public static void main(String[] args) {
         int houseMoney;
         String input;
         input = System.console().readLine("How much money do you have? > ");

         houseMoney = Integer.parseInt(input);

         if (houseMoney <= 250000 && houseMoney >= 100000) {
             input = "You can afford a Townhouse!";
         } else if(houseMoney >= 250001 && houseMoney <= 400000) {
            input = "You can afford a Single Family House!";
         } else if (houseMoney >= 400001 && houseMoney <= 800000) {
            input = "You can afford a Luxury House!";
         } else if (houseMoney >= 800001) {
            input = "Wow! You can Afford a mansion!";
         } else {
            input = "You can't afford a house!";
         }

        System.out.println(input);
    }
}