如何使字符串进入代码 [英] How to make a string in to code

问题描述

可能重复：

将字符串转换为代码

运行字符串中包含的代码片段

有什么办法把变量（string）变成一段代码？
我的字符串必须是可变的（非静态的）
如果你可以简单地解释一下就好：D

is there any way to turn a variable(string) into to a piece of code? My string has to be changeable (non-static) If you can explain it simply that would be nice :D

推荐答案

我假设你想用一些Java语句创建一个 String 对象，并且像内容一样执行。

I assume, that you want to create a String object with some Java statements and execute the content as if it was a method.

不，这是不可能的，因为这意味着，java是一种解释型编程语言。不是这样的。

No, it is not possible, because that would imply, that java was an interpreted programming language. Which is not the case.

您可以将行与某种类模板（在另一个字符串）合并，将其存储到文件中，使用jdk（使用`Runtime调用javac）进行编译。 exec）并使用自定义类加载器加载类，然后反映方法并希望最好。

You could merge the line with some sort of class template (on another string), store it to a file, compile that using the jdk (call javac with `Runtime.exec) and load the class with a custom classloader, then reflect the method and hope for the best.

使用相当新的Java Compiler API有一个相当复杂的方法，但我猜，这远远超出你的需要。 （还有一些更复杂的技巧，因为eclipse IDE提供了允许执行Java语句的视图。）

There is a rather complicated way using the fairly new Java Compiler API, but I guess, that is far beyond your needs. (And there have to be some more complicated tricks, because the eclipse IDE provides views that allow executing Java statements.)

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