错误:'else' 没有 'if' [英] Error: 'else' without 'if'

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本文介绍了错误:'else' 没有 'if'的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

得到一个没有 if 语句的 else:

Getting an else without if statement:

import java.util.Scanner;

public class LazyDaysCamp
{
    public static void main (String[] args)
    {
        int temp;
        Scanner scan = new Scanner(System.in);

        System.out.println ("What's the current temperature?");
        temp = scan.nextInt();
        if (temp > 95 || temp < 20);
            System.out.println ("Visit our shops");
            else if (temp <= 95)
                if (temp >= 80)
                System.out.println ("Swimming");
                else if (temp >=60) 
                    if (temp <= 80)
                    System.out.println ("Tennis");
                    else if (temp >= 40)
                        if (temp < 60)
                        System.out.println ("Golf");
                        else if (temp < 40)
                            if (temp >= 20)
                            System.out.println ("Skiing");                                                                                                                                                                                                                                                                   
    }
}

如果这就是它看起来的原因,我需要使用级联.另外,如果我正确地进行了级联,您能否告诉我?我一直没能找到级联的好例子,如果我知道级联意味着什么,我就尽力了.

I need to use a cascading if which is why it looks like that. Also, could you please let me know if I did the cascading if correctly? I haven't been able to find a good example of cascading if so I just did my best from knowing what cascading means.

LazyDaysCamp.java:14: error: 'else' without 'if'
            else if (temp <= 95)
            ^
1 error

这是我得到的错误

推荐答案

去掉这一行末尾的分号:

Remove the semicolon at the end of this line:

if (temp > 95 || temp < 20);

请使用大括号!Java 不像 Python 那样,在 Python 中缩进代码会创建一个新的块作用域.最好谨慎行事并始终使用大括号 - 至少在您获得更多语言经验并准确理解何时可以省略它们之前.

And please, please use curly brackets! Java is not like Python, where indenting the code creates a new block scope. Better to play it safe and always use curly brackets - at least until you get some more experience with the language and understand exactly when you can omit them.

这篇关于错误:'else' 没有 'if'的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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