Java 中的 Range(min, max, value) 函数
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Range(min, max, value) function in Java
提问by Ivan Seidel
Sometimes we write unnecessary code. My question is pretty simple: is there a method like the following?
有时我们会编写不必要的代码。我的问题很简单：有没有像下面这样的方法？
/** @return true if a given value is inside the range. */
public static boolean range(min, max, value)
I didn't find it on Google. Is that because it doesn't exist?
我在谷歌上没有找到。是因为它不存在吗？
采纳答案by Bohemian
You could create a typed Rangeclass that has a withinmethod:
您可以创建一个Range具有within方法的类型化类：
public class Range<T extends Comparable<T>> {
private final T min;
private final T max;
public Range( T min, T max ) {
this.min = min;
this.max = max;
}
public boolean within( T value ) {
return min.compareTo(value) <= 0 && max.compareTo(value) >= 0;
}
}
If min and max were the same for a group of tests, you could reuse your rangeobject for all tests.
如果一组测试的 min 和 max 相同，则您可以range在所有测试中重复使用您的对象。
FWIW, this seems kinda handy!
FWIW，这似乎有点方便！
回答by Dave Newton
Apache Commons Lang has a number of Range implementations, including NumberRange.
Apache Commons Lang 有许多 Range 实现，包括NumberRange。
Commons Lang 3 has a generic implementation.
Commons Lang 3 有一个通用的实现。
回答by Michael Borgwardt
um...
嗯...
value >= min && value <= max
surely if you really need a function for that you can easily write it yourself?
当然，如果您真的需要一个函数，您可以轻松地自己编写它吗？
回答by Dancrumb
It doesn't exist.
它不存在。
A 'sensible' place for it would be in the Math module, but since it's quite simply expressed in the expression
一个“合理”的地方是在 Math 模块中，但因为它在表达式中很简单地表达
min < value && value < max
it seems a little excessive.
好像有点过分了。
回答by Nanda Ramanujam
public static boolean withinRange(min, max, value){
return (value >= min && value <= max);
}
