用单词“ add”添加数字。 [英] Add numbers with the word "add"

问题描述

我正在写现在要用Java提供一个应用程序，而不是使用运算符 +，该应用程序的用户实际上可以使用单词 add将两个数字加在一起。

I am writing to offer an application in Java right now and instead of using the operator "+", the user of the application can literally use the word "add" to add two numbers together.

我对如何执行此操作非常执着，因为考虑到必须键入 add（ ），而不仅仅是添加。除非有一种方法可以执行不带括号的方法。我是否需要编写一个全新的类，或者有一种更简单的方法来做到这一点？

I'm quite stuck on how to do this because I can't really use a method in order to complete the function considering I'd have to type "add()" rather than just "add". Unless there is a way to execute a method without the parentheses. Would I have to write a completely new class or is there an easier way to do this?

推荐答案

（该想法的扩展由user710502呈现）

(An expansion on the idea presented by user710502)

您可以使用反射。

double a = Double.parseDouble(some user input);
double b = Double.parseDouble(some user input);
String operation = some user input; // i.e. "add", "subtract"
Method operator = Calculations.class.getMethod(operation, double.class, double.class);
// NoSuchMethodException is thrown if method of operation name isn't found
double result = (Double) operator.invoke(null, a, b);

在某些计算类别中：

public static double add(double a, double b) {
    return a + b;
}

public static double subtract(double a, double b) {
    return a - b;
}

// and so forth

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