相互之间是静态和非静态的重载 [英] are static and non static overloads each other

问题描述

这两个函数是否重载

class yogi{

   public static void fun(){
    System.out.println("Fun");
   }    

   public void fun(int a,int b){
    System.out.println("int");
   }

}

推荐答案

是的，那些是超载。来自 JLS 8.4.9 ：

Yes, those are overloads. From JLS 8.4.9:

如果一个类的两个方法（无论是在同一个类中声明，还是由一个类继承，或者声明一个和一个继承的）具有相同的名称，但签名不是覆盖等价的，然后方法名称被称为重载。

If two methods of a class (whether both declared in the same class, or both inherited by a class, or one declared and one inherited) have the same name but signatures that are not override-equivalent, then the method name is said to be overloaded.

对于静态和实例方法具有相同名称而言，它是一个相当罕见的（IMO），但它完全有效。

It's fairly rare (IMO) for it to be a good idea to have the same name for both static and instance methods, but it's entirely valid.

有趣的是，这可能会导致重载解析中的问题，即使没有实例调用方法，实例中也会包含方法。例如：

Interestingly, this can cause problems in overload resolution, in that instance methods are included even when there's no instance to call the method on. For example:

public class Test {
    public void foo(String x) {
    }

    public static void foo(Object x) {
    }

    public static void bar() {
        foo(""); // Error
    }
}

规范可以已被设计为可以正常（并调用静态方法），但它是一个错误：

The spec could have been designed so that this would be fine (and call the static method) but instead it's an error:

Test.java:9: error: non-static method foo(String) cannot be referenced
                    from a static context
        foo("");
        ^

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