从静态方法引用中获取类名 [英] Get class name from static method reference

问题描述

用什么代替 foo()?

What to replace foo() with?

class MethodIteration {
  public static void main(String[] args) {
    for (MyFuncInt m : new MyFuncInt[] { Class1::method, Class2::method })
      System.out.println(m.getClass().foo()); // want Class1, Class2 etc here
  }
}

抱歉，篇幅太短.移动设备;)

Sorry about brevity. Mobile device ;)

我不认为这是提到的问题的重复，因为我想在包含静态方法的类之外获取名称.如果我尝试 m.getClass().getName() 我得到MethodIteration$$Lambda$1:[someHash]".

I don't think it's a duplicate of mentioned question since I want to get the name while outside the class containing the static method. If I try m.getClass().getName() I get "MethodIteration$$Lambda$1:[someHash]".

推荐答案

恐怕你不能.对 Class1::method、Class2::method 的调用被封装在一个实现 MyFuncInt 的 lambda 闭包中，它没有方法来访问包装类(它甚至不是 lambda 类的声明字段).

I'm afraid you can't. The calls to Class1::method, Class2::method are wrapped inside a lambda closure that implements MyFuncInt, which has no methods to access the wrapped class (it's not even a declared field of the lambda class).

我想说你不能使用函数式界面.您必须创建一个函子，向该函子传递对类的引用(或只是带有类名的字符串)，以便稍后检索它:

I'd say you can't use a functional interface. You'd have to make a functor to which you pass a reference to the class (or just a string with the class name), so you can retrieve it later:

class MyFunctor implements MyFuncInt {

    public final Class<?> clazz;
    private final MyFuncInt func;

    public MyFunctor(Class<?> clazz, MyFuncInt func) {
        this.clazz = clazz;
        this.func = func;
    }

    @Override
    public void doSomething() {
        func.doSomething();     
    }
}

然后像这样实例化:

new MyFunctor(Class1.class, Class1::method);

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