Question

我在尝试在Eclipse中添加else语句时遇到了问题。我相信我这样做是正确的，因为我正在检查我可能犯的任何错误。我也在课堂上遵循了教授的指示，但我们在尝试添加else语句时遇到了同样的问题。我记得它第一次工作很奇怪。我得到的错误是“令牌上的语法错误”，否则“，”是预期的。我想要做的是额外的信用分配，我们创建一个程序，用户输入月份，然后程序告诉当月有多少天。这是我目前的代码。对不起，它是在一张图片中，我只是让我的朋友借用我的USB驱动器，认为Eclipse会自动在桌面上创建一个工作区，以防我断开闪存驱动器并编写代码....

https://s27.postimg.org/7h8c11eyb/myjavacode.png

import java.util.Scanner;

public class HowManyDaysInYourMonth {

    public static void main(String[] args) {
        System.out.println("Please enter the month:");
        Scanner myScanner=new Scanner(System.in);
        String month;
        month=myScanner.next();
        if(month=="January"||month=="january"||month=="March"||month=="march"||month=="May"||month=="may"||month=="July"||month=="july"||month=="August"||month=="august"||month=="October"||month=="october"||month=="December"||month=="december");{
            System.out.println(month+" has 31 days.");}
        else if (month=="February"||month=="february");{
            System.out.println(month+" has 29 days, but on leap years, February has 28 days.");
        }else if (month=="April"||month=="april"||month=="June"||month=="june"||month=="September"||month=="september"||month=="November"||month=="november");{
            System.out.println(month+" has only 30 days.");
        }
        myScanner.close();
    }
}

Answer 1

这应该有效：

import java.util.Scanner;

public final class Main {
    public static final void main(final String[] args) {
        System.out.println("Please enter the month:");

        final Scanner scanner = new Scanner(System.in);
        String month = scanner.next();

        if (month == "January" || month == "january" || month == "March" || month == "march" || month == "May"
                || month == "may" || month == "July" || month == "july" || month == "August" || month == "august"
                || month == "October" || month == "october" || month == "December" || month == "december") {
            System.out.println(month + " has 31 days.");
        } else if (month == "February" || month == "february") {
            System.out.println(month + " has 29 days, but on leap years, February has 28 days.");
        } else if (month == "April" || month == "april" || month == "June" || month == "june" || month == "September"
                || month == "september" || month == "November" || month == "november") {
            System.out.println(month + " has only 30 days.");
        }

        scanner.close();
    }
}

在Java中，if-else语句如下所示：

if(condition) {
    [...]
} else {
    [...]
}

此外，变量名称如＆＃34; myScanner＆＃34;不应该被使用，因为＆＃34;我的＆＃34;在这种情况下，并没有描述相关信息，但使代码的可读性降低。

如何在Eclipse中添加else（或if if）语句？

1 个答案: