为什么我不能在接口中声明静态方法？ [英] Why can't I declare static methods in an interface?

问题描述

主题大部分说明 - 静态方法无法在界面中声明的原因是什么？

The topic says the most of it - what is the reason for the fact that static methods can't be declared in an interface?

public interface ITest {
    public static String test();
}

上面的代码给出了以下错误（至少在Eclipse中）： 接口方法ITest.test（）的非法修饰符;只允许使用public& abstract。

The code above gives me the following error (in Eclipse, at least): "Illegal modifier for the interface method ITest.test(); only public & abstract are permitted".

推荐答案

有一个在这里玩的几个问题。第一个是在不定义静态方法的情况下声明静态方法的问题。这是

There are a few issues at play here. The first is the issue of declaring a static method without defining it. This is the difference between

public interface Foo {
  public static int bar();
}

和

public interface Foo {
  public static int bar() {
    ...
  }
}

第一个是不可能的，因为 Espo 提到：你不知道哪个实现类是正确的定义。

The first is impossible for the reasons that Espo mentions: you don't know which implementing class is the correct definition.

Java 可以允许后者;实际上，从Java 8开始，确实如此！

Java could allow the latter; and in fact, starting in Java 8, it does!

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