Is this OOP Java design ok?

IamtheWalrus

I have a puzzle that requires the following:

1. Take a number as input.
2. Convert that number to its English version.
3. Display that number.

I am required to demonstrate the following:

1. Clear separation of concerns
2. Well defined objects / interfaces
3. Application of good OO design principles to solve the problem
4. No code duplication
5. Test Driven Development
6. Well refactored code
7. Well tested code

I have designed and written the program and would like people's opinions on my design taking the above 7 points into consideration.

Would someone be willing to have a look at my code and tell me if it's a good solution?

I have attached the archive.

IamtheWalrus

I'm still not sure about the changes I've made, in terms of separation of concerns. My design now is as follows:

1. Main class
2. Translator class
3. Input, validator, convertor and display impls.

Main is as follows:

public static void main(String[] args) {
		
		Translator run = new Translator();
		
		run.setInput(new ConsoleInput());
		run.setValidator(new RegexValidator());
		run.setConverter(new DigitToTextConverter());
		run.setDisplay(new ConsoleDisplayer());
		
		run.translate();
	}

public class Translator {
	
	private IInput     	input;
	private IValidator	validator;
	private IConverter	converter;
	private IDisplayer 	display;

	public void translate(){
		
		do{
			// 1. Get user input
			String number = input.getInput();
			// 2. Validate input
			boolean isValid = validator.validate(number);
			String text = "";
			if(isValid){
				// 3. Parse input
				int intNumber = parseText(number);
				
				// 4. Convert input to English words
				text = converter.convert(intNumber);
			}
			// 5. Display words to user
			display.display(text);
		}while(true);
	}

But now the translator class is tightly coupled to the impls. Haven't I just pushed the issue into a Main class?. Is there anyway around this or am I overly complicating things?