java - Calling custom method of a class compiled at runtime -

i have java source code compiled @ runtime. i'm compiling source code (present string) , loading class below :

javacompiler compiler = toolprovider.getsystemjavacompiler();         compiler.run(null, null, null, sourcefile.getpath());           // load , instantiate compiled class.         urlclassloader classloader = urlclassloader.newinstance(new url[] { root.touri().tourl() });         class<?> cls = class.forname("takeadvantageoftmapcomponents", true, classloader); 

this class contains method need call named runjob. i'd like:

takeadvantageoftmapcomponents c  = new takeadvantageoftmapcomponents(); c.runjob(new string[]); 

now same method present in class compile @ runtime. how call ?

better using reflection call method want, might want declare interface class extend, such as:

package ccjmne;  public interface jobrunner {      public void runjob(final string[] args); } 

... , make class implement interface:

file: /home/eric/stackoverflow/a.java

package stackoverflow;  public class implements ccjmne.jobrunner {     public void runjob(final string args[]) {         for(final string str : args) {             system.out.println(str);         }     } } 

and finally, load class follows:

final class<jobrunner> cls = (class<jobrunner>) class.forname("stackoverflow.a", true, classloader); 

note know i've jobrunner here.

thus, can do:

cls.newinstance().runjob("hello world!".split(" ")); 

... , you're done!

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sample working code:

package ccjmne;  import java.io.file; import java.net.malformedurlexception; import java.net.url; import java.net.urlclassloader;  import javax.tools.javacompiler; import javax.tools.toolprovider;  public class jobrunnertest {      public static void main(final string[] args) throws classnotfoundexception, instantiationexception, illegalaccessexception, malformedurlexception {         final javacompiler compiler = toolprovider.getsystemjavacompiler();         final file root = new file("/home/eric/");         compiler.run(null, null, null, root + "/stackoverflow/a.java");         final urlclassloader classloader = urlclassloader.newinstance(new url[] { root.touri().tourl() });         final class<jobrunner> cls = (class<jobrunner>) class.forname("stackoverflow.a", true, classloader);         cls.newinstance().runjob("hello world!".split(" "));     } } 

output:

hello world!