Execute Java code in Java [duplicate]

Answer 1

No, you can not execute this code in your program.

Answer 2

Maybe you can run this as Groovy:

http://groovy.codehaus.org/Embedding+Groovy

Answer 3

Since Java 6, you can compile and run a Java compilation unit defined as a String or a File using standard APIs in the SDK (a compilation unit is basically everything that goes inside a .java file - package, imports, classes/interfaces/enumerations), take a look at this example. You can't run an arbitrary Java snippet like the one in your question, though.

If at all possible, it'd be a better idea to embed a different scripting language that allows you to run snippets of code from a Java program - for example, JavaScript, Groovy, MVEL, BeanShell, etc.

Answer 4

If you turn it into a full-blown source file, you can feed it to the java compiler programmatically, but last time I checked that was only available if you had the java SDK installed on your machine; it was not available on machines with the client distribution of Java. Of course, this may have changed since then. Look at package com.sun.tools.javac and you will find the java compiler API there.

Answer 5

There isn't a Java Core API function for doing this, but you can call javac either by using Runtime.exec or using some "unsafe" classes from com.sun.tools.javac Here's an example:

http://juixe.com/techknow/index.php/2006/12/12/invoke-javac-at-runtime/

Answer 6

I don't think you can execute a String containing a java code.

But it is worth a try if you can save that as a java source file and try to use ProcessBuilder class to execute.

Never tried it and not sure if it is best way to do it. So use it with caution :)

Good Luck!

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