Java: Can I Code in a String? [duplicate]

Question

Possible Duplicate:
Executing java code given in a text file
using eval in Java

I have written a Java program, and I was wondering if I can do Java in a String. For example, let's say I have the following:

String s = "int i = 1;";

In the String above, I have a Java command in it. Can I execute the Command outside the String in my actual program?

This question is answered in the following question: stackoverflow.com/questions/935175/convert-string-to-code — alanmanderson
– alanmanderson, Commented Sep 18, 2012 at 20:23
I'd say, yes & no. Yes you can do dynamic compilation, but, probably not the way you're trying (I'd be happy to be wrong). Take a read through Generating Java classes dynamically through Java compiler API to start with (first link off Google) — MadProgrammer
– MadProgrammer, Commented Sep 18, 2012 at 20:25
Why do you need that? Are you forced to work with Java? Maybe a dynamic language supporting eval is what you are looking for, even though I discourage doing something like that as it makes your code much harder to understand and maintain — mariosangiorgio
– mariosangiorgio, Commented Sep 18, 2012 at 20:28

Tim Bender · Accepted Answer · 2012-09-18 20:26:09Z

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You would be able to do this with something like BeanShell.

answered Sep 18, 2012 at 20:26

Tim Bender

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Brian Over a year ago

I agree, +1. Much safer than compiling and running using the compiler API

Community · Accepted Answer · 2017-05-23 12:27:16Z

1

While parsing Java like that might be tricky you could use something like Rhino to evaluate JavaScript in a string. This might be a bit outside of what you are asking though.

edited May 23, 2017 at 12:27

CommunityBot

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answered Sep 18, 2012 at 20:24

Jason Sperske

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Community · Accepted Answer · 2017-05-23 12:12:16Z

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No, you cannot enter code into a String like that. The " symbol essentially delimits the real code from a String.

Once you type in String xyz = you are creating a variable, and what comes next needs to be a STring value. Maybe later you can do something with that, but as of now it's not execcutable

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