如何验证字符串数组包含某个字符串? [英] How can I verify that an array of strings contain a certain string?

问题描述

给出:

String[] directions = {"UP","DOWN","RIGHT","LEFT","up","down","right","left"};

String input = "Up";

如何验证stdin的输入是否在directions数组内?

How can I verify that an input from stdin is within the directions array or not ?

我可以循环使用input使用equal来检查每个项目，但是我正在寻找一种更优雅的方法.

I can make a loop and check each item with input using equal ,but I'm looking for a more elegant way.

关于罗恩

推荐答案

将有效路线数组转换为列表:

Convert the array of valid directions to a list:

List valid = Arrays.asList(directions)

或者直接将其声明为:

List valid = Arrays.asList("UP", "DOWN", "RIGHT", "LEFT", "up", "down", "right", "left")

然后可以使用contains方法:

if (valid.contains(input)) {
    // is valid
} else {
    // not valid
}

请注意，这与混合大小写输入(例如"Up")不匹配，因此您可能只想将大写值存储在列表中，然后使用valid.contains(input.toUpperCase())

Note that this won't match a mixed case input such as "Up" so you might want to store just the uppercase values in the list and then use valid.contains(input.toUpperCase())

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