Java是否具有相同的比较运算符示例=== [英] Does Java have Identical Comparison Operator example ===

问题描述

Java是一个强大的静态强制转换，所以这意味着没有用于===

Java is a Strong Static Casting so does that mean there is no use for "==="

我查看过大量的文档并且没有看到相同的比较运算符。

I have looked at tons of documentation and have not seen Identical Comparison Operator.

推荐答案

=== 在弱类型语言中很有用，例如Javascript，因为它验证被比较的对象是相同的类型并避免隐式转换。

=== is useful in weak typed languages, such as Javascript, because it verifies that the objects being compared are of the same type and avoids implicit conversions.

=== 在Java等强类型语言中绝对没用，因为如果不编写特定的方法，就无法比较不同类型的变量。

=== has absolutely no use in a strongly typed language such as Java because you can't compare variables of different types without writing a specific method for doing this.

例如，如果要将 int 与 String 进行比较>在 Java 中，您必须编写一些特殊方法：

For example, if you want to compare an int to a String in Java, you will have to write some special method as such:

boolean compareIntString(int i, String s) {
    return (i == parseInt(s));
}

但这实在是太过分了。 （正如你所注意到的那样，这个方法只接受一个 int 和一个 String 。它没有' t只接受任何两个变量。在你调用它之前你知道数据类型是不同的。）

But this is pretty much overkill. (And as you'll notice, as written, this method only accepts an int and a String. It doesn't accept just any two variables. You know before you call it that the datatypes are different.)

重点是，虽然你可以做 i == s 在 Javascript 中，你不能做 i == s 在 Java 中，所以你不需要 === 。

The main point is, that while you can do i == s in Javascript, you can't do i == s in Java, so you don't need ===.

我想，简短的回答是 Java 的 == 是 Javascript 的 === 。如果你想模仿 Javascript 的 == 并比较两个项目，忽略数据类型，你将不得不编写一个自定义方法，接受通用数据类型作为参数...并找出至少比较 Java 的原始数据类型的所有可能组合的逻辑......

I guess, the short answer is that Java's == is Javascript's ===. If you want to emulate Javascript's == and compare two items, ignoring data type, you'll have to write a custom method which accepts generic data types as arguments... and figure out the logic on comparing, at a minimum, all the possible combinations of Java's primitive data types...

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