System.out.println("14. Command: ");
Command helloWorldCommand = new HelloWorldPrintCommand();
helloWorldCommand.execute();
System.out.println("15. Interpreter: ");
HelloWorldInterpreter helloWorldInterpreter = new HelloWorldInterpreter();
helloWorldInterpreter.interpret("println('Hello Interpreter!')");
System.out.println("16. Iterator: ");
HelloWorldCharacterIterator helloWorldCharacterIterator = new HelloWorldCharacterIterator("Hello Iterator!".toCharArray());
while (helloWorldCharacterIterator.hasNext()) {
System.out.print(helloWorldCharacterIterator.next());