Object oriented design questions

Design does not mean implementation.
Design means:

1. what all classes you will have
2. The methods(functionality) your classes will provide
3. What will be the relation between classes you have
4. What will be the Lifetimes of objects of your classed
5. Having said a design is not something which gets done in a mere 15-20mins of an interview.It's all blood and sweat and it needs lot of time and consideration albeit discussions to arrive at a good design.
6. In a interview the Questioner usually want to know if you can think in the right direction atleast.

Check design pattern interview questions here

Interview questions : 

• Tutorial for object oriented design
• Design hashmap
• Design concurrent linked hashMap
• Design customers "who bought also bought" section in amazon.
• Design a restaurent order management.
• Design a java vector class which allows a maximum of 3 threads to access add and get methods simultaneously.
• Design a chess game.
• Difference between Static class and singleton patterns