有没有办法将 switch 与 String.contains("") 集成? [英] is there a way to integrate a switch with String.contains("")?

问题描述

我需要检查 String 对象是否包含 () 各种子字符串，并根据结果执行不同的代码段.目前我有一系列 else if.如果可能，我想将其转换为开关.有没有办法做到这一点?

I need to check if a String object contains() various substrings and based on the results have different pieces of code execute. Currently I have a series of else if. I would like to convert it into a switch if possible. Is there a way to do this?

目前:

 if (SomeString.contains("someSubString")) {

    . . . do something

 } else if (SomeString.contains("anotherSubString")) {

    . . . do something else

 } else if (SomeString.contains("yetanotherSubString")) {

    . . . do something even more different

 }  
 .
 .
 .

推荐答案

当我遇到这样的情况，实在不想用else if时，我会这样做:

When I have a situation like this, and really don't want to use else if, I do something like this:

String[] cases = {"someSubString", "anotherSubString", "yetanotherSubString"};

int i;
for(i = 0; i < cases.length; i++)
    if(SomeString.contains(cases[i])) break;

switch(i) {
    case 0: //someSubString
        System.out.println("do something");
    break;
    case 1: //anotherSubString
        System.out.println("do something else");
    break;
    case 2: //yetanotherSubString
        System.out.println("do something even more different");
    break;
    default:
        System.out.println("do nothing");
}

当然，这有几个缺点.首先，如果您在除末尾之外的任何地方添加另一个字符串，所有索引都会发生变化，您必须手动进行更正.尽管如此，我认为我已经使用过一两次这样的东西，并认为它使代码更具可读性.据推测，索引在程序中具有某种意义，因此以对问题有意义的方式耦合了 0...someSubString.

Of course, that has a couple of downsides. For starters, if you add another strings anywhere but the end, all the indices will shift, and you have to correct for that manually. Still, I think I have used something like that once or twice and thought it makes the code more readable. Presumably, the indices had some meaning in the program, thus coupling the 0...someSubString in a way meaningful to the problem.

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