Execute without compiling

[Amod Gupta]

I want to develop a java program which takes another java program as input and executes the input java program.Can anyone please suggest me how to do it?Thanks.

[Bhagat Singh Rawat]

Amod Gupta wrote:I want to develop a java program which takes another java program as input and executes the input java program.Can anyone please suggest me how to do it?Thanks.

It looks like you want to develop another JVM in Java why do you want to do that? what do you want to?

[Amod Gupta]

no i dont want to develop a jvm what i want to do is take a java program as input compile the input program and execute it from my main program only.

[Maneesh Godbole]

Check out the javax.tools.JavaCompiler

[Amod Gupta]

thanks

[Bhagat Singh Rawat]

Amod Gupta wrote:no i dont want to develop a jvm what i want to do is take a java program as input compile the input program and execute it from my main program only.

You want to do something like

   
Class Main {

  public static void main(String ...args){
   String className;
   className= args[0];
   Class clazz = Class.forName(className);
    //Now you have class object you can play with it
  .......................
  }
}

Or you want to take java code as input and compile that code in side of the Main class??

[Amod Gupta]

Bhagat Singh Rawat wrote:
Or you want to take java code as input and compile that code in side of the Main class??

doesnt matter say i have the class in a string variable.

[Bhagat Singh Rawat]

Amod Gupta wrote:doesnt matter say i have the class in a string variable.

Go through the link below, may be it will help you!!!

Compile a Java source from inside a Java program

[Amod Gupta]

@Bhagat Singh Rawat
Thanks a lot

[Jesper de Jong]

What Bhagat Singh Rawat proposed won't help you, that code shows you how to dynamically load a class - but the class will have to be compiled beforehand.

[pawan chopra]

This link Generating classes should help you. Go throught the article really useful.

[Amod Gupta]

Now I want to save the input program.Can i save it in a database such as ms access?If yes then how.

[Ulf Dittmer]

By "input program", do you mean the source code? If so, that's just a string, so any character field should do. If you mean the class file, then you need a BLOB field. Search the JDBC forum (and the Sun Java Tutorial) for how to use either of those.

[Amod Gupta]

Ulf Dittmer wrote:By "input program", do you mean the source code? If so, that's just a string, so any character field should do. If you mean the class file, then you need a BLOB field. Search the JDBC forum (and the Sun Java Tutorial) for how to use either of those.

So there is no size limit to string field?

[Ulf Dittmer]

That depends on your DB, but VARCHAR fields can often be made as large as 2^31 bytes, which is sufficient for Java source files.

[shan raj]

look at this beanshell. This may help you to get some idea or use it.