java switch语句在很多情况下简化了 [英] java switch statement many cases simplified

问题描述

所以让我们说一个 switch 语句是，

So lets say a switch statment is,

switch (month) {  
    case 1: monthString = "January";  
        break;  
    case 2: monthString = "February";  
        break;  
    case 3: monthString = "March";  
        break;  
    case 4: monthString = "April";  
        break;  
    case 5: monthString = "May";  
        break;  

是否可以将其缩短为类似

Is it possible to shorten that to something like

switch (month) {
    cases 1-3: monthString = "January";
        break;
    case 4-5: monthString = "April";
        break;

所以在一个案例下有多个案例编号?我正在这样做，因为我有 100 个案例.30 导致一个答案，20 到另一个，5 到另一个等等......所以如果我可以使用多个案例，我应该大量减少大部分代码.我还应该在每种情况下提到我想做一些事情，如果我使用一系列 if else 语句，它只会让我执行一个操作，所以我似乎无法走那条路.谢谢你的帮助！抱歉，我是新手！

So that multiple case numbers are under one case? I'm doing it as I have 100 cases. 30 lead to one answer, 20 to another, 5 to another etc... so if I can use multiple cases I should cut down the bulk of the code by alot. I should also mention at each case I will want to do a few things and if I use a series of if else statements it only lets me perform one action so I cannot seem to go that route. Thanks for any help! sorry I'm new at this!

推荐答案

是否可以将其缩短为类似

Is it possible to shorten that to something like

在 Java 教程 中有更好的解释 switch 语句

It's better explained in Java Tutorial The switch Statement

是的，你可以做到.

一些关键点:

• 不要忘记添加 break 语句.
• 在所有分组案例之后添加单个 break 语句.
• 永远不要忘记添加 default 案例.

• Don't forget to add the break statement.
• Add single break statement after all grouped cases.
• Never forget to add default case as well.

示例代码:

    int month = 1;
    String monthString = null;

    switch (month) {
        case 1:
        case 2:
        case 3:
            monthString = "January";
            break;
        case 4:
        case 5:
            monthString = "April";
            break;
        ...
        default:
            ...
    }

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