Java by API/javax.tools/JavaFileObject

JavaFileObject: Kind.SOURCE

   <source lang="java">
     

import java.lang.reflect.Method; import java.net.URI; import java.util.Iterator; import java.util.NoSuchElementException; import javax.tools.JavaCompiler; import javax.tools.JavaFileObject; import javax.tools.SimpleJavaFileObject; import javax.tools.ToolProvider; public class Main {

 public static void main(String[] args) throws Exception {
   JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
   String program = "class Test{" + "   public static void main (String [] args){"
       + "      System.out.println (\"Hello, World\");"
       + "      System.out.println (args.length);" + "   }" + "}";
   Iterable<? extends JavaFileObject> fileObjects;
   fileObjects = getJavaSourceFromString(program);
   compiler.getTask(null, null, null, null, null, fileObjects).call();
   Class<?> clazz = Class.forName("Test");
   Method m = clazz.getMethod("main", new Class[] { String[].class });
   Object[] _args = new Object[] { new String[0] };
   m.invoke(null, _args);
 }
 static Iterable<JavaSourceFromString> getJavaSourceFromString(String code) {
   final JavaSourceFromString jsfs = new JavaSourceFromString("code", code);
   return new Iterable<JavaSourceFromString>() {
     public Iterator<JavaSourceFromString> iterator() {
       return new Iterator<JavaSourceFromString>() {
         boolean isNext = true;
         public boolean hasNext() {
           return isNext;
         }
         public JavaSourceFromString next() {
           if (!isNext)
             throw new NoSuchElementException();
           isNext = false;
           return jsfs;
         }
         public void remove() {
           throw new UnsupportedOperationException();
         }
       };
     }
   };
 }

} class JavaSourceFromString extends SimpleJavaFileObject {

 final String code;
 JavaSourceFromString(String name, String code) {
   super(URI.create("string:///" + name.replace(".", "/") + Kind.SOURCE.extension), Kind.SOURCE);
   this.code = code;
 }
 public CharSequence getCharContent(boolean ignoreEncodingErrors) {
   return code;
 }

}

 </source>