为什么Java 8中的接口允许使用main方法？ [英] Why are interfaces in Java 8 allowed to have the main method?

问题描述

为什么接口允许在Java 8中使用 main 方法？

Why are interfaces allowed to have a main method in Java 8?

如下面的代码中所述工作正常并正确生成输出。

As stated in below code it works fine and produces output properly.

public interface Temp {
    public static void main(String args[]){
         System.out.println("Hello");
    }
}

目前它表现得像一个类，我已执行使用main方法接口。

Currently it is behaving like a class and I have executed interface with main method.

为什么我们需要这个？

推荐答案

从Java 8开始，接口中允许使用静态方法。

Since Java 8, static methods are allowed in interfaces.

main（）是一种静态方法。

main() is a static method.

因此，接口允许使用main（）。

Hence, main() is allowed in interfaces.

我们不需要这个，因为以前不允许，但我们幸存了下来。但是，根据定义，静态方法不是绑定到类的实例，而是绑定到类本身，因此在接口中允许它们是有意义的。它允许在接口本身中定义与接口相关的实用程序方法（例如，在 Collections 中找到的），而不是单独的类。）

We don't need this, since it wasn't allowed before, and yet we survived. But since static methods, by definition, are not bound to an instance of a class, but to the class itself, it makes sense to allow them in interfaces. It allows defining utility methods related to an interface (like the ones found in Collections, for example), in the interface itself, rather than a separate class).

类静态方法和接口静态方法之间没有区别。

There is no difference between class static methods and interface static methods.

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