Convert strings to executable java code

Hey,
I'm not sure how easy or hard this is to accomplish, but I am looking for a way to take a string from a JTextField and use it as a control structure for an IF block.
For example, the user inputs 'keyword=="test" || keyword=="test2"' I want to use it in an if block to control it.
Is there a way to do this? I realize the java file is already compiled in a class, so the string would probably be incapable of doing such a thing.
Any thoughts would be appreciated!

Basically this is impossible, because Java is a compiled language, but there are ways around it.
Actually the ways are all basically one way: use an interpreted language. You can embed one into Java. You can write your own, new language (it could be a small simple mini-language, for example one that only evaluates boolean expressions; this is easier than it sounds), or you can use one that already exists.
There already is an interpreted language for Java. It's called BeanShell. Also I'm told that someone has written a javascript interpreter for Java, but I don't know the details.
I'd suggest Googling for BeanShell. It sounds like the quickest, easiest solution.
But be careful: letting users execute arbitrary code can be a huge security hole.

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