使用java反射调用setter方法 [英] Invoking setter method using java reflection

问题描述

我需要使用反射来调用类的setter方法，代码如下：

I need to invoke the setter methods of a class using reflection, and the code is as below:

try {             
   Method method = myObj.getClass().getMethod("set" + fieldName, new Class[] { value.getClass() });               
   method.invoke(myObj, value);
     } catch (Exception ex) {
         ex.printStackTrace();
     }

值是一个 ArrayList ，setter方法如下：

The value is an ArrayList and the setter method is as below:

public void setNames(List<String> names){
    this.names = names;
}

A java.lang.NoSuchMethodException ，但当setter方法参数类型从 List 更改为 ArrayList 时执行得很好。有没有办法将setter方法参数保持在超类型中并且仍然使用反射而无需在从类中获取方法时手动给出参数类型？

A java.lang.NoSuchMethodException is thrown when running this code, but when the setter method parameter type is changed to ArrayList from List it executes fine. Is there a way to keep the setter method parameter in super type and still use reflection without manually giving the type of the parameter when getting the method from the class?

推荐答案

与其他答案相反，有一个非常简单的解决方案。请参阅 java.beans.Statement 。它为您提供了一种执行任意反射代码的方法，而无需担心实际与正式类型（以及其他一些事情）。

Contrary to other answers, there is a really simple solution. See java.beans.Statement. It gives you a way to execute arbitrary reflective code without having to worry about actual vs formal types (and a few other things).

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