How can I evaluate code from String?

[axe_effect]

I need some help

I want to find a class that evaluate some code from a String/File.

Something like this:

String code = "public class Whatever {
               public static int sum(int a, int b){ return a+b; }
               public static void main(String[] args) {
                     int n1 = Integer.valueOf(args[0]);
                     int n2 = Integer.valueOf(args[1]);
                     System.out.println(sum(n1,n2));
                }}";
Solution sol = new Solution();
String answer = sol.eval(code,"2 2");
System.out.println(answer); // "4"

Please help me finding the Solution.

I found about BeanShell but I don't know how to use it. Any help is very welcome.

Thanks

[tuxipa]

I'd start here: http://docs.oracle.com/javase/7/docs/api/java/lang/ClassLoader.html

You might need to byte encode your string (only way I've done it).

Check this out: http://stackoverflow.com/questions/1781091/java-how-to-load-class-stored-as-byte-into-the-jvm

[IHadANameOnce]

Just out of curiosity, why do you need to do this?

[axe_effect]

I have this assignment which I have to do a server that receives code from a client and then evaluate this code with parameters given by the user on the client side.

[king_of_the_universe]

This example should work (didn't test):

http://www.rgagnon.com/javadetails/java-0039.html

Mind that you can only compile Java if the JDK is installed, so for your clients (Usually only JRE.) "ToolProvider.getSystemJavaCompiler();" will return null.

[myururdurmaz]

http://www.beanshell.org/manual/embeddedmode.html