调用方法时参数数量错误 [英] Wrong number of arguments error when invoking a method

问题描述

我有 AClass 类和一个方法 someMethod，它获取一个 Object 数组作为参数.

I have class AClass and a method someMethod that gets an Object array as parameter.

public class AClass {
    public void someMethod(Object[] parameters) {
    }
}

在main中，当我尝试在我创建的对象上调用此方法并将对象数组作为该方法的参数时

In main, when I try to invoke this method on the the object that I have created and give an object array as a parameter to this method

Object[] parameters; // lets say this object array is null
Class class = Class.forName("AClass");
Object anObject = class.newInstance();

Method someMethod = class.getDeclaredMethod("someMethod", parameters.getClass());
someMethod.invoke(anObject, parameters);

我收到错误数量的参数错误".我错过了什么?

I get "wrong number of arguments error". What am i missing?

推荐答案

没关系.

Object[] parameters = {new Object()}; // lets say this object array is null
Class clas = Class.forName("AClass");
Object anObject = clas.newInstance();

Object[] param = {parameters};

Method someMethod = clas.getDeclaredMethod("someMethod", parameters.getClass());
someMethod.invoke(anObject, param);

注意调用方法的第二个参数.它是 Object[] 本身，你的方法的参数类型也是 Object[].

Be careful about the second parameter of the invoke method. It's Object[] itself, and the argument type of your method is Object[] too.

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