iFactory = il.getInstructionFactory();
il.add(iFactory.getField(Modifier.STATIC,
"java/lang/System",
"out",
"Ljava/io/PrintStream;"));
il.add(iFactory.pushConstant("Hello world!"));
il.add(iFactory.invoke(0, "java/io/PrintStream", "println", printlnSig));
il.add(iFactory.returnMethod(method));
return c.getByteCode();
}