是否有干净的语法来检查多个变量是否都具有相同的值？ [英] Is there clean syntax for checking if multiple variables all have the same value?

问题描述

我们有n个变量 X = {x1，x2，... xn} 它们不属于任何结构。

We have n variables X = {x1,x2,...xn} they are not in any structures whatsoever.

在python中我可以这样做： if（x1 == x2 == x3 == xn）：

In python for example I can do that: if (x1 == x2 == x3 == xn):

在java中我必须这样做： if（（x1 == x2）&&（x2 == x3）&&（x3 == xn））：

In java I must do: if((x1 == x2) && (x2 == x3) && (x3 == xn)):

您是否知道改进此语法的简单方法？ （想象一下很长的变量名和很多）

Do you know a simple way to improve this syntax? (Imagine very long variable name and lot of them)

谢谢。

推荐答案

如果你有很多这些变量，你是否考虑将它们放在一个集合中而不是将它们作为单独的变量？此时有各种选项。

If you have lots of these variables, have you considered putting them in a collection instead of having them as separate variables? There are various options at that point.

如果你发现自己做了很多，你可能想要编写辅助方法，可能使用varargs语法。例如：

If you find yourself doing this a lot, you might want to write helper methods, possibly using varargs syntax. For example:

public static boolean areAllEqual(int... values)
{
    if (values.length == 0)
    {
        return true; // Alternative below
    }
    int checkValue = values[0];
    for (int i = 1; i < values.length; i++)
    {
        if (values[i] != checkValue)
        {
            return false;
        }
    }
    return true;
}

glowcoder提供的替代方案是强制至少有一个值：

An alternative as presented by glowcoder is to force there to be at least one value:

public static boolean areAllEqual(int checkValue, int... otherValues)
{
    for (int value : otherValues)
    {
        if (value != checkValue)
        {
            return false;
        }
    }
    return true;
}

在任何一种情况下，请使用：

In either case, use with:

if (HelperClass.areAllEqual(x1, x2, x3, x4, x5))
{
    ...
}

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