Java中的Javascript .apply（）方法等价吗？ [英] Javascript .apply() method equivalent in Java?

问题描述

我想用类名和可变数量的参数（即具有可变长度的Object [] args）在Java中创建一个类。有没有办法实现这个目标？

I want to create a class in Java from a classname and an variable number of arguments (i.e. an Object[] args with variable length). Is there any way to achieve that?

基本上，Javascript中的方法看起来像这样。

Basically, the method would look like this in Javascript

function createClass(classname, args) {
    protoObject = Object.create(window[classname].prototype);
    return window[classname].apply(protoObject,args) || protoObject;
}
// I want to be able to do this:
var resultClass = createClass("someClass", someArrayOfArgs);

只调用函数的简单函数看起来像

A simpler function to only call a function would look like

function callFunction(functionName, args) {
    return window[functionName].apply(null,args);
}

谢谢！

为了澄清，这将是Javascript中的一些示例用法：

For clarification, this would be some example usage in Javascript:

function multiplyResult(var1,var2) { 
    return var1*var2;
}
var result = callFunction("multiplyResult", ["5", "2"]); // == 10

function multiplyObject(var1,var2) { 
    var result = var1 * var2;
    this.getResult = function() { return result }; 
}
var result = createClass("multiplyObject", ["5", "2"]).getResult(); // == 10

推荐答案

事实证明你可以只需向 invoke（）函数提供一个 Object [] ，它的工作方式与。采用以下函数。

It turns out that you can simply provide an Object[] to the invoke() function and that it will work exactly like .apply() in Javascript. Take the following function.

public int multiply(int int1, int int2) {
    return int1*int2;
}

从同一个班级，它可以调用函数，如

From the same class, it works to call the function like

Object result = this.getClass().getDeclaredMethod("multiply",classes).invoke(this,ints);

类和 ints 类似于

Class[] classes = new Class[] {int.class, int.class};
Object[] ints = new Object[] {2,3};    

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